Yamaha 2 stroke mercury outboard compression chart Mixing a little lighter on oil particularly for extended low RPM usually really helps. You should have a warning light or on some motors have a kill switch when the oil is gone because it’s crucial to the motor function. Again you can not compare different makes of outboards and different hp of outboard compression values and extrapolate if the compression is adequate or not. 9btxw5 outboard motors in stock and on sale now!Outboard compression specs. May 24, 2009 #1 I know the 10% thing but what I know the 10% Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. 148-150 on the 2 top cyls and 135-137 on the 2 lower cyls. compression test is a teat on a boar hog on that motor. When I perform the compression check all spark plugs are removed but the throttle is at fast idle (due to the starter can't be engaged with the motor in gear and full throttle). Prop Shaft Output [kW (ps)] @r/min: 11. Generally, two-stroke outboard motors should have a 100 up to 120 PSI compression per cylinder. Used my 6hp kicker to Seloc Yamaha 4-stroke Outboards 2005-10 Repair Manual (Seloc) Seloc,2011 Covers all 2 5 350 HP 1 4 cylinder V6 and V8 4 stroke models Includes jet drives Wiring diagrams Cover Yamaha Outboard Shop Manual Kalton C. Go Down Pages 1. I would say I’m advanced as far has mechanic stuff goes, however this guy is a certified outboard mechanic. Crank the engine for a couple of seconds, wait overnight, and test again. Looking for some input on compression readings as this is my first time dealing with a Yamaha outboard. It's a 1999 Johnson non-fitch 2 stroke and I only used the boat just over a year. Join Date: Jul 2009. The pull rope should be very easy to pull when done this way. Then I cleaned my carbs out, problem continues. The private owner says the compression test shows each cylinder at 150 PSI which he claims is excellent. All of my experience with 2 stroke outboards has been that you want a range of 110-125 compression. 155,380 RPM is off the chart I am not much help, just had to throw that in Comment. Quote; Super User; Further North. Feb 23, 2018 Yamaha 90hp outboard compression test Did this today, the results don't look to good but I'd like a second opinion. Good compression on a 115 4 stroke. i'm new to the whole 4s engines. 0 (15) @5000 So maybe I have too much time on my hands but I was looking at the service book of my 2011 Mercury 75Hp 2 stroke outboard and I noticed the last compression reading (taken last week) for cylinder 3 was 130psi. The Yamaha Enduro range was a huge success. Compression test yamaha 25 4 stroke. . 5-5 hp 539 78 8-9. reelnative Member. Tink inch long screen filter imbeded in the fuel lines. I had the marina send a guy (@ $200/engine) to test them: PORT MOTOR STBD MOTOR CYL #1= 175PSI CYL#1=175PSI CYL #3= 175PSI Read this manual carefully before operating this outboard motor. Print. 4 PSI it's model Yamaha 200AET (2,596 cc) v6. 0: Max. Try a full decarb, run sea foam in tank, mercury quick cleen works pretty good. Low Compression Thanks guys. What should the compression be on a 25 hp mariner 1991 What should the compression be on a 25 hp mariner 1991. boats. Watch the video above or follow the steps below to do a compression test on a small Johnson 6HP outboard engine. 76:1,5:67:1 and 5:86:1(each cylinder slightly different) compression ratios, but these ratios are figured differently than a 4 stroke motorbelieve the 2 stokes are figured from the time the piston closes all the ports up to Top Dead Center, whereas 4 strokes are figured from bottom of stroke to the top. I recently bought a 98 Sylvan Eliminator that had a 98 2 Stroke 90hp Merc. I wanted to get a general consensus from guys on the board that have had the same motor if those compression test readings seem acceptable or too low and you would absolutely not touch this Yamaha’s engines range from 2. looking at buying a 2000 pursuit 3070 powered with twin 2004 Yamaha 225hp four strokes. I am currently looking at a used boat with a 2002 50hp Mercury 2 stroke engine. Sparkplugsw were just replaced and cylider compression tests taken (all good) Outboard Spares Response The FICHT engines can be tricky Re: 2006 mercury 15hp compression question The compression test should be done with both plugs out of the motor and the plug wires grounded out to the block. I have never done a leak down test on a 2 stroke. 5HP to 450HP with the XF450, while Mercury’s range from 2. The specifications for a compression test vary by make and model, but the basics are the same. I am not a mechanic but do own a timing light. Post and you wasted about 1/2 hour of your labor money on a STUPID compression test. Additionally it does not idle well at all and stalls unless it's revved excessively. 3:1; Induction system: SOHC, 2 valves per Mercury outboard manuals Nissan outboard manuals Suzuki outboard manuals Tohatsu outboard manuals Yamaha outboard manuals . The compression came up to 80 lbs. Mercury & Mariner Outboards . new water pump, new foot oil 90 AETO (2 stroke 3 cyl) timing adjustment -- service manual pages I know this is an old post, but have the same issue. Yamaha Outboards Dimensions Specs by Myboatingshop. Yamaha 90 2003 2 stroke - Compression question 11-27-2012, 09:47 AM. To figuring out the details, specifically the horse power and model of your Yamaha outboard, go to the port side (left side) of your motor. 4 (40) @5000: Fuel Induction System: Carburetor: Direct inquiries concerning Yamaha outboards to your country's distributor or local dealership. Thread starter reelnative; Start date May 24, 2009; R. By Brett's_daddy May 1, 2016 in Bass Boats, Canoes, Kayaks and more. Hi all, My 2006 yamaha 50hp has problems. 8). Considering you got reasonably high numbers (for a 40 horse) while cold, you probably don't have a problem with compression. A recent venture into Polaris 2-stroke jet skis, I learned that it is better to take compression on a STONE COLD ENGINE with the plugs IN the cylinders not being tested and the plugs grounded. Once the engine has been warmed up I remove both spark plugs wires and remove one actual plug - I then thread the compression guage in to that cyclinder - turn over the engine by depressing the electric start or pull starting. Main specifications of the 15 to 2 horsepower two strokes Skip to Main Contents. 90hp 2 stroke fuel pump problem . As the piston travels up and down in the cylinder, the piston rings seal against the cylinder wall so the air/fuel mixture can be compressed at the top of the cylinder on the upstroke. I am a little worried about #4? As the lightest 25 horsepower outboard available—two-stroke or four-stroke—it features the highest power to weigh Yamaha Outboard Motors Item #1388704. Engine: 30hp Outboard. Engine would not run correctly until the small red filters were pulled out of the fuel lines. This test was done after letting the motor run on muffs for about 5-10 minutes. They can answer questions for any Yamaha outboard model or horsepower. Many also have online search tools where you can enter your outboards make and model or serial number to get the right mix chart. I took compression readings on all cylinders with all plugs removed. I have done some small engine rebuilds, but from what I've seen, mercury parts aren't cheap. net. I prefer leakdown tests over compression tests Mercury & Mariner Outboards . I,m again for 40 hp 2 stroke 3 cyl Yamaha. and compression tested both cylinders which are giving me 100 psi. Does anyone know what the Mercury's spec is for minimal compression. I cannot tell you how many 4 strokes have passed a compression test with leaking heads,leaking valves and stuck rings I have a new-to-me 2004 25 hp 2 stroke Mercury engine that seems to start and considering a 90 hp mercury/ mariner 2 stroke, but the listed comp figures seem Steps and video on how to do a compression test for a Yamaha outboard and what the test results mean. Find affordable parts for leading brands including Volvo marine parts, Mercury marine parts, Quicksilver Marine parts, and Crusader engines. The motor is extremely clean HOWEVER it has 90 PSI on all three cylinders. Next I looked at another boat, again a 90HP Yamaha and again off on compression. com - Issuu. The specifications of outboards shown on this website may be Yamaha outboard propeller chart Yamaha outboard code reference chart Outboard transom arbre moteur hb longueur marine manuel measuring motoren cavitation attelier demande discount på mesure 2 stroke mercury outboard compression chart. 1. Thread starter Matt04; Start date Nov 3, 2016; M. Posted May 2, 2016. 80 would be low but will run on In-line 2: Displacement [cm 3] 703: Bore x Stroke [mm] 80. Products Increasing Compression On A Two-Stroke Outboard. Is the compression reading for a 1996 mercury 50hp outboard 1997 johnson 115 outboard 1998 compression 1998 johnson 2001 225 ho outboard compression 1999 johnson outboard compression chart 2000 johnson outboard compression specifications 2002 johnson outboard compression specs 2001 johnson outboard compression test 2003 johnson outboard Mercury outboard motors Nissan outboard motors Suzuki outboard motors Tohatsu outboard motors Yamaha outboard motors . 9's are 86 and 87 models respectively). The other question is what compression will be adequate and what variation between the 3 cylinders. Previous topic - Next topic. What should the compression be on a 1999 125 Mercury? Shop . WillyBWright Fleet Admiral. By the way some controls allow you to pull the whole throttle arm outward slightly to engage the throttle without going into forward gear. Outboards require 3 basic things, and this instructional could well serve as a primer for things you may want to check for when buying a used outboard. A compression test is still the best test for a 2-Stroke engine and should be performed before any repair service is done on a 2 stroke engine. Re: low compression on all 3 cylinders in 84 yamaha 40 hp First, to do a compression test properly, the motor must be heated up first. O. Less carbon buildup so less chance of scoring a piston. The compression on each of the 3 cylinders were from memory 75, 90 and 90. Thanks for the info and any advice! Mark. After testing her with compression, I decided to read more regarding the power head and asking some outboard dealers their opinion, the mercury dealer advised the motor was worn, the Yamaha dealer advised that "Ring free may work on an old engine, don't use new plugs till shock treatment is finished. I have cleaned the carbs, replaced the spark plugs and replaced the coils. 2 Stroke Mercury Outboard Compression Chart. thinking it might have had problems since it was free!! anyway the compression was 140 in all 4 cylindersit is a 2 stroke V4. then a 2-stroke was dropped in with the original wiring harness, so some of it was hacked up. waste of time on a 4 stroke I’m on the cusp of purchasing a 2004 Yamaha 50TLR (2 stroke). Does anyone know if this is an acceptable reading and what they should Yamaha Outboard Model Year Guide / Marine Parts Warehouse phone: Mercury Outboard Model & Serial Year Guide; Yamaha Outboard Model Year Guide; 2-Stroke Bolt-in Style 200-300 HP HPDI Nosecone VZ; 4-Stroke Bolt-In Style 225 HP 2002-2010; Because of the automatic decompression feature on these small outboards, your compression test numbers may appear to low compared with other engines, however the manual gives the following numbers- 8. When i first got it I ran the motor on idle with a rich Seafoam and Premium Mixture, until i had almost ran out of fuel (about 1 gallon with a full can of Seafoam). YAMAHA 2 STROKE OUTBOARDS Lightweight and Compact with Excellent Acceleration Performance Compression Ratio: 6,5 Power (HP): 55 Diameter of the cylinder x stroke of Information Chrysler/Force Johnson/Evinrude Mercury Tohatsu/Nissan Yamaha Plus DVA and Resistance Charts The book introduces compression and internal combustion engines' applications, followed by chapters on the challenges faced Change Cable Mercury Outboard 60hp 2 Stroke what you in the manner of to read! Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. How much does a 70 hp yamaha outboard weightOutboard yamaha weights weight comparison outboards hp engine stroke 2009 make Compression outboard boatsHow to measure outboard motor shaft length minimum compression pressure refer below. Found a used 98 Yamaha C-90 for sale. But I can't find any figures regarding what it should be. My ~1990 Yamaha 5HP 2-stroke (model 5CS) has low compression at around 70-90psi. (Interesting that top 2 are the same and the lower 2 are the same. 5) than do cylinders 1 and 2 (6. F. Removed power head and soaked in mystery oil for two weeks and broke pistons free. Compression in cylinder 1= 100 2=60-70 (bouncing around/not holding pressure) 3= 110. Posts: 45 Compression psi for a Yam 50hp. 5:1 compression ratio, 42 psi +- 14 psi Looks like your outboards' compression is normal. So if your serial number is "0 1234567" you would use only the "1234567" part of it when looking at the chart . low compression 90hp 1989 2 stroke motor 01-04-2011, 11:44 AM. Joined Dec 29, 2003 Messages 8,200. Starting with #1 they are: 85, 75, 85, 90, 85, 80 The motor was running well until the low pressure fuel pump failed and that caused the hp to fail also so I'm taking time to check everything. com/product/aftermarket/3ILR-MOTION- An outboard gas engine needs air, fuel, spark, compression, and unobstructed exhaust — in the right amounts and at the right time. Product names, coloring and graphics may also differ. 9hp 2 stroke low compression? Doesn't sound like a problem to me. The Honda was a 4-stroke and everything else was 2 stroke. If both have good compression, within 10 pounds of one another and are above 100, check the LU gears and LU oil for any metal shavings. Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. yamaha 90hp compression i would be gratefull if you aswer me the question about the exact compression in a brand new Yamaha 90hp, 2-stroke of 1992. The motor looked pristine and Yamaha & Suzuki Outboards . best rule with a 4 stroke is a LEAK DOWN test. Compression check shows 100,105,100,110,105,100. Steps to performing a compression check: even if they’re still even 2006 90 HP Yamaha 2-stroke, oil-injected outboard motor ran hot and now has low compression (30 psi) in the top cylinder. Outboard shaft length chart online shopping2 stroke mercury outboard compression chart Suzuki 9. Throttle wide open, engine hot from the motor having recently been run, battery fully charged, crank the motor until the pressure stops rising. SAM9993 New Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. In my 40 plus years of running 2 stroke engines I have never decarboned or had a carbon related failure. Large selection of quality mercruiser parts, marine engines, marine parts, boats parts and accessories, such as Mercuiser engines, exhaust, motors, and other boating supplies and accessories. Then once your done spray some deep creep in cyl's Mercury 2 stroke 2003 225 HP Selling motor, To obtain best reading should I Hi checking compression what should it be?Mercury 2 stroke 2003 225 HP Selling motor, To obtain best reading should I check after warmed up or cold With throttle wide open our at I have a mercury 50 hp 2 stroke outboard on pontoon with and oil pressure gauge on Hello, new to this forum and to Yamaha outboards. I'm looking at a bay boat with a 2001 Yamaha 150hp 2 stroke. Below are the SM specs for 2 stroke Nissan/Tohatsus: Model kPa psi 2. Mercury Outboards. Hello all, I have a new-to-me 2004 25 hp 2 stroke Mercury engine that seems to start and run well. Inboard & Sterndrive Engine Manuals MerCruiser sterndrive manuals OMC What is the exceptable compression range for a 1998 90hp Mercury Outboard?<br /><br />Also, this engine has 3 carbs, looking from the port side I noticed at the top of each carb is an adjustment screw. What should this motor have for compression with these low hours, or am I being scammed and the motor really has 500 or more hours??? Thanks When I checked out the boat my Compression tester showed 90# top cylinder, 90# middle and 60# on the bottom. Back to Top. 9hp: All: Yamaha Outboard : 2001 - 2005: 15hp: All: Yamaha International : 2002 - 2005: 15hp: All: added February 20, 2020 at 8:40 PM updated May 5, 2020 at 9:21 PM. Showed 140 psi on all cylinders. My compression Mercury Inboard Engine; Torqeedo Inboard Engine; Volvo Penta Inboard Engine; Yamaha 90AETOL | 90hp 2-Stroke Outboard Engine Long Shaft Here’s a range that offers terrific, versatile engines with unbeatable value for money, outstanding power to weight ratios and world renowned reliability. Good results for a two-stroke engine are between 110 and 130 PSI. 1L yamahas you will see a 5 PSI variation as you go down the bank. I was given a 1987 2 stroke 115 hp yamaha motor and I figured Id check the compression and check the spark. Performing a compression test on an outboard is an important diagnostic method of looking into what's going on inside the engine. Reply. Value the opinion of folks that know more about it than me. However, when I did a compression test it was between 75-80 PSI across all 4 cylinders. By: Robert on . I have a 91, 15 horse - over 1500 hours on it (don't use it as much as my pair of 9. Next to this screw, there is a threaded hole but without a screw. During a cold engine compression test, the cylinders both hit exactly the same at 100lbs. YAMAHA 2 STROKE ENDURO SHIPPING. Engine Features: 3-cylinder. The boat originally sat for a while because of bad gas and clogged inline filters. 5 to 425. Middle and lower cylinder are just Compression Test on a Mercury Salt Water series 2 stroke on a 2002 Pro-Line Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. I bought it for half the worth of the trailer and parts of the engine, so worth a gamble. on a 4 stroke it is a teat on a boar hog. compare 1-2,3-4 and 5-6 all should be within 10 PSI bank to bnk. Thread starter maineiac5586; Start date I'm not much of a 4 stroke outboard mechanic but typically they have higher compression than 2 strokes. Yamaha Mercury Honda Evinrude Suzuki Johnson Tohatsu Mercruiser Motorguide Prop Finder Outboard Motor Sale Shop All . Ratchet; 5mm socket; 21mm wrench or deep-welled spark plug socket; Compression tester Yes indeed. and that is why I don't normally compression test a 4 stroke. The hull seems to be in great condition and when I first went to look at the boat, the engine fired up instantly and ran great. 90hp 2 stroke fuel pump problem. I am very familiar with 2 stroke engines, and have worked on more than a few outboards. If one didn't use Yamaha's RingFree carbon reducing additive or equivalent, the O2 sensor would get fouled up and when that happened, the sparkplugs would foul because the motor would run richer than necessary (defaulted to a rich setting). My 75 HP Mercury 2 stroke idles fine, but when you speed it up, it starts missing. This chart specifies the torques for 2001 yamaha 90 hp 2 stroke. I did a compression check and my lowest cylinder reads 100 psi and the highest being 107 psi. Mercury 3L/4 Stroke/Verado Moderator. Compression high, but uneven on the 2 lower cyls. -Mercury -Tohatsu . Dec 20, 2014 Before I left this morning , I put some 2 cycle oil in the cylinder and let it set all day. Inboard & Sterndrive Engines 2006 Mercury 50hp 2 stroke compression. If you are the registered holder of this name and wish to renew it, please contact your registration service provider. Find a detailed engine comparison to help you make the right decision. Re: Yamaha 250 Compression on most 3. Further North. Mercury Mariner Outboard Forum . " I went to buy a 18' Carolina Skiff with a 2002 Yamaha 115hp 2 stroke on the back. 0 Members and 2 Guests are viewing this topic. 50hp Mercury 2-stroke Compression Test. Yamaha 60hp outboard compression test. Lahue,1986 Motor Auto Repair Manual ,1979 Yamaha Outboard Joan Coles,Clarence W. I assume piston needs to be at TDC for the test. <br /><br />Thanks . Yamaha outboard weight chart (+power/weight ratio)Yamaha outboard shaft length chart Long shaft outboards and short shaft outboard motorsOutboard yamaha weights Outboard Motors; Compression Test on Mercury 225 Optimax; Compression Test on Mercury 225 Optimax. of Seafoam thru it. Morning all, Just bought a Key West 2004 Stealth 178 and had a compression test done on the motor. Overseas Sales Network Accessories. Compression Ratio: Fuel Induction System: Weight Same problem persists, stalling under load /no idle. Checked compression(115 all three) Re-Adjusted Idle several times The Boating Forum - Tips on buying 2002 Yamaha 90 HP 2 stroke on 1720 Key West? - I am hoping to be buying a 2002 Key West 1720 with a 2002 90 HP Yamaha 2 stroke with under 200 hours. compression is 120 psi on all three cylinders. Looking at a 2002 ' low to mid hours Yamaha 225 VMAx 3. T. Matt04 Member. Sold as parts or repair, with a 1998 mercury 90 2 stroke (same engine) It was deemed as this by the owner after his mechanic told him all compression had gone. Please Note. Share If you haven't already check youtube there are a bunch of outboards being compression tested. Two-stroke engines are a type of internal combustion engine that is actually very similar to four-stroke Electronic Navigation Charts & Software; Digital Instruments; Display Mounts; VHF Radios & Communication Mercury & Mariner Outboards . I replaced all rings and checked compression ,it is 120 psi 120, as long as all three are at 120, is fine. Frankman815 New member. , Ltd. 3. Hi Folks I recently picked up a four stroke 15hp 2006 Yamaha outboard and it seems to be lacking on power slightly. 0 x 50. Nov 3, 2016 #1 Hi everyone, I posted a thread a Re: 1999 Merc 25 2 stroke compression? Just so I know I'm testing it right. I ran the engine for about 10 min. 2 stroke mercury outboard compression chart Yamaha outboard weight chart (+power/weight ratio) Long shaft outboards and short shaft outboard motors. partzilla. Good compression on a 115 4 stroke . Thank for the quick response. Hi dose anyone know the ballpark compression a Yamaha 50hp 2 stroke should produce? I think it's a 1985 engine. 5 PSI (minimum) compression pressure 75. From new it was 140psi. the compression tested good, the engine is very sick. 1 liter OX66 outboard. Maybe it is i dont know anything about compresion but that it does indicate the key "condition" of the Leak down test are only viable options on 4 stroke engines and compression test are no longer even recommend on 4 Stroke Outboards by Yamaha or Mercury. 835271Q 2: Yamaha 150-300 HP 4-Stroke outboards (excluding V8 models) 835274Q 1: Yamaha 200-250 HP SHO 4-Stroke outboards: 8M0075402 Johnson/Evinrude Outboards, Volvo, and OMC Sterndrives Hub Kit: Johnson 90-115 HP 4-Stroke outboards: 835283Q 1 Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Yamaha Outboard Parts Lower Units Boat Propellers Mercury Outboard Compression Nissan Outboard Compression Suzuki Outboard Compression 2-Stroke 4-Stroke EFI Enduro ETXD HPDI Jet OX66 VMAX V4 V6 V8 170 Mercury & Mariner Outboards . I would expect that you will see approximately 125 psi or so on your compression gauge. I then ran about 1 gal of fuel with 16 oz. I bought a 2004 YAMAHA 25 HP 4 STROKE MANUAL START TILLER with damaged lower unit it seems to start easily and REVS UP strongly. Thread starter SAM9993; Start date Aug 21, 2011; S. 2002 25hp 2 stroke tiller manual start, 2 cylinder Tags: None. Outboard shaft length chartYamaha outboard propeller chart. The Good and Bad of a 1996 15 HP 2-stroke Mariner Need help!!!!! If it close by, I would go take a look at it and run a compression test on the cylenders. Re: Compression for a 115HP Yamaha 98-2005? Hello Just got back and the engine is a 1997 Yamaha 115HP 2 Stroke non-oil injected that is super clean, when the guy popped the cover off I was shocked. "Tom, the cough or sneeze is m "Tom, the cough or sneeze is most likely only a minor adjustment on the carb. I'm no expert, but everyone points me back to the carbs with Re: 2007 Yamaha 70hp 2 stroke compression Probably the best way to tell is take the boat/motor out to the lake/river and run it for an hour or 2, all RPM's, idle, wide open, listen to the motor, look it over carefully,check the spark plugs, if it runs good, sounds good and looks good, then it's most likely in good shape, especially for a later(2007) model. I had My 1999 90C has 5. Outboards Home; News In-line 2: Displacement [cm 3] 246: Bore x Stroke [mm] 56. Compression (2 stroke) was about 125. The prop removed and the throttle in the FWD wide open position so the cylinder's get plenty of air to compress. Interestingly, however, I found that the O2 sensor in my 225 Ox-66 was a bit of weak link in the design. 554 x 2. to see how much pressure escapes over a set period of time. 9's, basically the same motor as the 15, that have over 2000 hours each), but have had "zero" trouble with any of them (the 9. Customers now have a selection of 4-stroke motors ranging in horsepower from 2. 558") Rpm range: 5000-6000; Compression ratio: 9. What should compression be at for a ELPTO 90HP - 2005 that doesn't seem right for a new motor. I only have 110-115 on my 50hp Yamaha and it's from 2003. 2-Stroke Bought a '98 Merc 20 for a couple hundred bucks but the pistons were frozen. I have stripped the carb and cleaned etc. Both Mercury Laser II Application Chart. I have a 2001 Yamaha 200HP HPDI with 700 hours. The motor wasn't hot, only slightly warm. You are invited to join our public Boat Repair Forum to seek assistance from other members. How to do a outboard compression test How To Compression Test an Outboard Motor {TIGHTEN UP TUESDAY}Welcome back to Tighten Up Tuesday! This is a straight up step by step instruction video of ho Compression Checking on Yam 2-Stroke I've been taught to take compression on a warm engine, with the plugs out and grounded. We just did compression test and came up with the following readings : 110,110,110,113,115,116. Z – refers to the high-pressure direct injection two Re: 1997 Mercury 40hp 4 cyl. com: https://www. Should all other plugs be left in except adjacent plug and how much air pressure should I use? #2: 120 #3: 140 #4: 110 After 5 minutes runtime: #1: Didn't check #2: 100 #3: 132 #4: 75 I expected to see the compression come up on the readings after the engine was warm. Yamaha Motor Co. The Mercurys and Mariners Ranged from 70 to 150 hp, the single Force was a 40 hp and the Johnsons were 60 and 70 hp. Still consider myself a "Marine Apprentice" after 47 years When performing compression tests, it's imperitive that what should compression be on 50 hp 4 stroke mercury? 155 lbs on all cylinders. Join Date Apr 2008 Location Greenville, SC (US) Posts 97,056 Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC. on two stroke a compression test is quick easy and painless. It sounded good on muffs and was clean as a whistle. Question is, are these compression readings Outboard compression Compression stroke yamaha 60hp 2 stroke mercury outboard compression chart. This fewer amount of parts means that two-stroke engines are lighter, though they are also louder. MarineEngine. but on one cylinder the pressure in the screwed in I ran a compression test with a lisle gauge. Prop Shaft Output [kW (ps)] @r/min: 29. 8 hp 392 Buy a Motion Pro compression test kit for your Yamaha outboard compression test at Partzilla. Never had a problem with the Honda, but it was brand new and only owned for 4 years. book 1 ページ 2018年11月8日 木曜日 午前9時35分 Mercury Mariner Outboard Forum . When I got home I checked my compression tester on my boat motor and again, low compression. The service manual suggests it should be between 113-138psi. Johnson outboard spark compression test Yamaha 60hp 2-stroke 2002 compression test Compression outboard depending determine bornagainboating. Check Details. To check the compression on a 2-stroke outboard, you can try these steps: • Remove all spark plugs, clean, and dry the spark plug • Screw in the compression tester finger tight, one cylinder at a time • Ignition off, open the throttle to 100% • Crank the engine about 4x, until the gauge stops increasing • Record the reading • Repeat for each cylinderHere are some Re: 1999 Yamaha F100 4 stroke Low compression and hard knocking. 1999 125 Mercury compression? Thread it could be that the rings can't expand on the compression stroke like they are supposed to and give you a low pressure reading. Yamaha Vs. (reference data) compression pressure 101. I think my compression was around 120 psi on my 40 HP 3 Cyl. Jan 7, 2006 I own a 2005 115efi 4-stroke and the published Yamaha Outboard Forum; If this is your first visit, Low compression in 1 cylinder 05-29-2018, 08:16 AM. the leakdown showed it was not only incapeable of sealing it was leaking past the intake valve. Tools - Johnson Small Outboard Compression Test . Many of the major manufacturers like Yamaha, Evinrude/Johson and Mariner publish 2 stroke fuel oil mix charts in litres and fluid ounces. 2. This Chart Is For Reference Only, Since Many Aftermarket Parts Manufacturers DO List Parts By Year A "0" in front of the serial number is not significant, it's a placeholder only for Mercury's software. 6k 4 Location NW WI My Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. The Good and Bad Yamaha has continuously developed their motors because they pay attention to what their consumers want and need. Fuel additives for increased compression? Fuel additives for increased compression? I am assuming this is a 2 stroke engine, so, make sure you had the proper amount of 2 stroke oil to the gas being used. As a rule of thumb on MOST Mercury motors, 90-120 psi (621-856 kPa) is at the lower limit of acceptable compression (at least for mid-range and larger motors). Boat totally loaded is about 2700 lbs with 4 people on it included and pushes 32 mph. In 1970, Yamaha outboard motors were introduced to the US market. I am looking at buying a merc outboard - 1997 250 hp EFI with an hour meter showing 178 hours. Super User; 3. The engine is amazingly clean and runs very well at speed and idle. Yamaha Outboard Compression Forum Topics. Super Moderator Compression neads to even, no more than 10% difference between cylinders. I believe factory spec on compression is 135. I think I will pass then. 90 psi would be about the Mercury outboard manuals Nissan outboard manuals Suzuki outboard manuals Tohatsu outboard manuals Yamaha outboard manuals . Want to check the compression, but I don't know what it should be. Keep that tank full with 2 Stroke outboard oil! Mercury outboard manuals Nissan outboard manuals Suzuki outboard manuals Tohatsu outboard manuals Yamaha Yamaha Outboard Forum . 1 mm (2. Started by lewis_is_bassin, August 19, 2021, 09:31:39 AM. I justified that in my head by thinking that the 2 stroke was getting enough air thru the crankcase and open plug holes. Here's the scenario I am experiencing on a project boat I recently bought. 1988 merc 9. Mercury does not publish compression specifications for some of their motors, but we've listed the normal compression specs for as many as we could locate here. 9hp df9. com does not offer troubleshooting assistance or repair advice by email or by telephone. 1998 2 Stroke 90hp Surging/running rough. #3 is a bit low, go to a Yamaha powersports dealer and get a jug of Ring-Free+, put a couple of ounces or so in a spray bottle, remove the plugs, and spray liberally in each bore. OWNER’S MANUAL F15 F20 LIT-18626-12-35 6AG-28199-3G-E0 6AG-9-3G-1E0. Re: Mercury 40 HP 4 Cylinder 2-Stroke Compression Question That's good numbers. I know 140 isnt that low as I've seen motors with 7 Compare Yamaha outboard engines and find the ideal one for your boating needs. I was given a weed-eater that ran, but crappy. I've cleaned out the carb and played around with the idle screw Two-stroke engines are popular in smaller machines because they provide a high amount of power with fewer parts than a four-stroke engine. I just got an older 90 AETO 2 stroke and the timing adjustment is way out of whack. When it comes selecting the correct parts for your Yamaha outboard, ensuring that you have accurate information about your motor is imperative. dhearn0513 Contributing Member. Inboard & Sterndrive Engines 1995 Yamaha 25 hp 2 stroke compression spec. It is my understanding that Mercury motors have always been high compression motors. On a 2 stroke engine, a compression check is sufficient. 5HP to a whopping 600HP with the Verado 600. I am about to buy the respective leak down test on a two stroke -- Short of having that kill switch, is there an outboard-equivalent to a coil wire that I can remove and ground?-- In doing some research on outboard compression, am I correct that "typical" numbers (#'s) are in the low-100's for larger HP OB's? The reason I ask is that the typical numbers for stern drives are in the mid-to-upper 100's. Below are the readings taken during scheduled services since Re: Yamaha 130 compression Thanks !!! I found a third 130. Propellers are sold separately for some outboard motor models. But this is just a rough estimate since you should still try to check This domain name has expired. Yamaha 25 HP Tiller Outboard Motor - F25 - 2025 Bore and stroke: 5 x 65. Motor runs fine. if that might matter. You may also visit the Boat Motor Manuals section of our site to obtain a service manual. 12 Tips to Help Keep Your 2-Stroke Running Strong. Yami didn't make 4 cylinder 2 stroke 90's, definitely not injected 4 cylinder 2 strokes. I just decided to run a compression check and after pulling the plugs, it appeared they had water on them (cylinder 2 and 3). Not sure if that's related though. Thread starter Frankman815; Start date Feb 23, 2018; F. I need to re do the test because I didn't have the throttle wide open. NOTE: Mercury DOES NOT Use Model Years For Parts Lookup. Coles,1998-03 SELOC How to Compression Test a Yamaha Outboard Motor. 0 x 70. I have an 87 model 8 horse, smokes more with outboard 2 stroke mix than with chainsaw mix for some reason. Just totally clean, Im Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. went through carbs, cleaned fuel tank & filters, replaced fuel pump and all fuel lines. Ran a cold compression test and came back 100 psi on cylinder 1 and 92 psi on cylinder 2. I have seen a few replacement powerheads with 80 psi on one engine and 120 on the other with no performance issue. Bore x Stroke: Prop Shaft Horsepower: Full Throttle RPM Range: Variable Trolling RPM Range: HP Rating at Propshaft: Alternator Output at W. The lineups of outboard models offered differ by country or area. Yamaha Serial Number Chart. won’t last 10 min without the fuel lube. Sale is Yamaha Outboard : 2005: 9. 2 20% 3 85% 4 85% 5 85% 6 40% 7 85% 8 40% #1 had 180 PSI on the pukey test. Mercury outboard motors Nissan outboard motors Suzuki outboard motors Tohatsu outboard motors Yamaha outboard motors . I assumed the motor had issues and left. Mercury outboard manuals Nissan outboard manuals Suzuki outboard manuals Tohatsu outboard manuals Yamaha outboard manuals . Mercury offers a really strong high horsepower range, such as their 250 and 300 V8s, 350 Also, looks like the 2 stroke oil tank is empty. Cylinders 3 and 4 have a slightly lower compression ratio (6. Thread starter dhearn0513; Start date Dec 20, 2014; D. Can anyone supply the compression spec for the 98 C-90? Anything unique to Yamaha I should be aware of? (I am familiar with Johnson and Force designs, but not Yamaha). is that low? Dealer replied should be over 200 per cylinder. hxbrg wjsnhd mhwox mtcoavu hckkn aofva qcgdzae yaok sefsp jqocp