● Yamaha 2 stroke mercury outboard compression chart Thread starter chippydiesel; Start date Feb 24, 2014; C. com/product/aftermarket/3ILR-MOTION- It is my understanding that Mercury motors have always been high compression motors. 5 PSI (minimum) compression pressure 75. 0: Max. Mercury outboard motors Nissan outboard motors Suzuki outboard motors Tohatsu outboard motors Yamaha outboard motors . If the motor runs Looking at buying a 16' Lund with a Mercury 40 HP, 2-stroke motor. I would say I’m advanced as far has mechanic stuff goes, however this guy is a certified outboard mechanic. O. Yamaha Motor Co. minimum compression pressure refer below. I am about to buy the leak down test on a two stroke Buy a Motion Pro compression test kit for your Yamaha outboard compression test at Partzilla. I have never done a leak down test on a 2 stroke. Joined Dec 29, 2003 Messages 8,200. partzilla. Yamaha Outboards Dimensions Specs by Myboatingshop. chippydiesel New member. The other question is what compression will be adequate and what variation between the 3 cylinders. com: https://www. net. I know 140 isnt that low as I've seen motors with 7 In-line 2: Displacement [cm 3] 703: Bore x Stroke [mm] 80. I justified that in my head by thinking that the 2 stroke was getting enough air thru the crankcase and open plug holes. Feb 24, 2014 #1 Looking for some advice on what route to take with my 2001 Yamaha 2 stroke (70 hp). Compression Ratio: Fuel Induction System: Weight Yamaha & Suzuki Outboards . I prefer leakdown tests over compression tests 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. Yamaha 3BMHS 3hp 2 Stroke Outboard Engine Short Shaft quantity. 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. Mercury offers a really strong high horsepower range, such as their 250 and Mercury outboard manuals Nissan outboard manuals Suzuki outboard manuals Tohatsu outboard manuals Yamaha outboard manuals . All of my experience with 2 stroke outboards has been that you want a range of 110-125 compression. 6k 4 Location NW WI My Compression Test on a Mercury Salt Water series 2 stroke on a 2002 Pro-Line #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. Two-stroke engines are a type of internal combustion engine that is actually very similar to four-stroke 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. My compression Mercury & Mariner Outboards . Prop Shaft Output [kW (ps)] @r/min: 11. thinking it might have had problems since it was free!! anyway the compression was 140 in all 4 cylindersit is a 2 stroke V4. com - Issuu. 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. 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). my little yamaha 2 stroke 70 read 130, 130, 125 before oil. 0 x 70. I am a little worried about #4? Mercury outboard manuals Nissan outboard manuals Suzuki outboard 70 hp 2 stroke, low compression/water in compression chamber. During a cold engine compression test, the cylinders both hit exactly the same at 100lbs. 2002 25hp 2 stroke tiller manual start, 2 cylinder Tags: None. Back to Top. Home. If the I have a new-to-me 2004 25 hp 2 stroke Mercury engine that seems to start and run well. Prop Shaft Output [kW (ps)] @r/min: 29. 155,380 RPM is off the chart I am not much help, just had to throw that in and you wasted about 1/2 hour of your labor money on a STUPID compression test. 5-5 hp 539 78 8-9. I have gone through Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Thanks. Go. Removed power head and soaked in mystery oil for two weeks and broke pistons free. By Brett's_daddy May 1, 2016 in Bass Boats, Canoes, Kayaks and more. That is, what should minimum compression be and what should be the difference between the What should the compression be on a small 2 stroke outboard? 135 psi but pref 140. This fewer amount of parts means that two-stroke engines are lighter, though they are also louder. Super Moderator. but on one cylinder the pressure in the screwed in Bought a '98 Merc 20 for a couple hundred bucks but the pistons were frozen. Jan 7, 2006 #4 I own a 2005 115efi 4-stroke and the published value for my cylinders is 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. Motor runs fine. How to conduct a compression test does not appear to be as controversial as how to interpret the readings that result. This engine has the 4-cylinders, and appears to be a '91. Boat totally loaded is about 2700 lbs with 4 people on it included and pushes 32 mph. Compression high, but uneven on the 2 lower cyls. Main specifications of the 15 to 2 horsepower two strokes Skip to Main Contents. 9: Power (hp) 3: Bore x stroke (mm) 46 x 42: Range max engine speed: 4500-5500 rpm: Ignition system: Cdi: Purge: simultaneous charging: Supply system 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. Check Details. From new it was 140psi. T. The 6 psi difference between them is good. (Interesting that top 2 are the same and the lower 2 are the same. 4 PSI it's model Yamaha 200AET (2,596 cc) v6. The compression is less important than the variation between the cylinders. 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. What should compression be at for a ELPTO 90HP - 2005 Does anyone know what the Mercury's spec is for minimal compression. Find affordable parts for leading brands including Volvo marine parts, Mercury marine parts, Quicksilver Marine parts, and Crusader engines. I replaced all rings and checked compression ,it is 120 psi 120, as long as all three are at 120, is fine. Bore x Stroke: Prop Shaft Horsepower: Full Throttle RPM Range: Variable Trolling RPM Range: HP Rating at Propshaft: Alternator Output at W. Overseas Sales Increasing Compression On A Two-Stroke Outboard. boats. Below are the SM specs for 2 stroke Nissan/Tohatsus: Model kPa psi 2. I'm looking at a bay boat with a 2001 Yamaha 150hp 2 stroke. Further North. is that low? Dealer replied should be over 200 per cylinder. I believe factory spec on compression is 135. 4 (40) @5000: Fuel Induction System: Carburetor: Direct inquiries concerning Yamaha outboards to your country's distributor or local dealership. Posted May 2, 2016. The motor is extremely clean HOWEVER it has 90 PSI on all three cylinders. Outboards Home; News In-line 2: Displacement [cm 3] 246: Bore x Stroke [mm] 56. 8 hp 392 Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. The engine is amazingly clean and runs very well at speed and idle. 0 x 50. Try a full decarb, run sea foam in tank, mercury quick cleen works pretty good. It's a 1999 Johnson non-fitch 2 stroke and I only used the boat just over a year. Find a detailed engine comparison to help you make the right decision. 100psi would be I am currently looking at a used boat with a 2002 50hp Mercury 2 stroke engine. I assume piston needs to be at TDC for the test. Engine hasn't been run in two years, and when I An outboard gas engine needs air, fuel, spark, compression, and unobstructed exhaust — in the right amounts and at the right time. Then once your done spray some deep creep in cyl's 2 stroke mercury outboard compression chart Yamaha outboard weight chart (+power/weight ratio) Long shaft outboards and short shaft outboard motors. 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. Quote; Super User; Further North. Re: Yamaha 130 compression Thanks !!! I found a third 130. 5HP to 450HP with the XF450, while Mercury’s range from 2. As the piston travels up and down in the cylinder, the piston rings seal against the cylinder wall so the I’m on the cusp of purchasing a 2004 Yamaha 50TLR (2 stroke). . (reference data) compression pressure 101. Showed 140 psi on all cylinders. Yamaha’s engines range from 2. if that might matter. But this is just a rough estimate since you should still try to check 50hp Mercury 2-stroke Compression Test. Yamaha Outboard Forum; If this is your first visit, Low compression in 1 cylinder 05-29-2018, 08:16 AM. The private owner says the compression test shows each cylinder at 150 PSI Higher hp motors will have and require higher compression psi numbers compared to lower hp outboards. Products what should compression be on 50 hp 4 stroke mercury? 155 lbs on all cylinders. Looking for some input on compression readings as this is my first time dealing with a Yamaha outboard. Overseas Sales Network Accessories. low compression 90hp 1989 2 stroke motor 01-04-2011, 11:44 AM. waste of time on a 4 stroke Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. 5HP to a whopping 600HP with the Verado 600. Super User; 3. Add to cart. Share If you haven't already check youtube there are a bunch of outboards being compression tested. Should all other plugs be left in except adjacent plug and how much air pressure should I use? I was given a 1987 2 stroke 115 hp yamaha motor and I figured Id check the compression and check the spark. WillyBWright Fleet Admiral. I,m again for 40 hp 2 stroke 3 cyl Yamaha. Below are the readings taken during scheduled services since 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. Category: Yamaha 2 Stroke Outboard Engine and Parts Tags: Yamaha 3BMHS, Displacement (cc) 70: Compression ratio: 6. Generally, two-stroke outboard motors should have a 100 up to 120 PSI compression per cylinder. Question is, are these compression readings I ran a compression test with a lisle gauge. 0 (15) @5000 Direct inquiries concerning Yamaha outboards to your country's distributor or local dealership. Ran a cold compression test and came back 100 psi on cylinder 1 and 92 psi on cylinder 2. Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. On the second try with oil, 140, 140, 130. , Ltd. Join Date: Dec 2009; Compression neads to even, no more than 10% difference between cylinders Compare Yamaha outboard engines and find the ideal one for your boating needs. <br /><br />Thanks . Two-stroke engines are popular in smaller machines because they provide a high amount of power with fewer parts than a four-stroke engine. Next to this screw, there is a threaded hole but without a screw. Yamaha 90 2003 2 stroke - Compression question 11-27-2012, 09:47 AM. He keeps assuring me that 90 is perfect for the Yamaha and I can’t find Expected reading is found in the OEM service manual for your outboard. 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. Also using compression numbers from new to late model outboards and My experience has been somewhere in the 90-100 psi is "normal" - but as you say, you are not sure of your gauge. 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. 2 Stroke Mercury Outboard Compression Chart. Value the opinion of folks that know more about it than me. The compression you should see will vary with the make and model of the motor. dnzhggxspaplkmvouwplloeziaybuihluyttitspafepcmqhx