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The cost savings is considerable. For example, the venerable 2.5-liter V6 Mercury 150 EFI has a list price of $9,925 with a 20-inch shaft suitable for a bass boat. A low-emissions Merc 150 OptiMax two-stroke is priced at $12,650, while the supercharged four-stroke Mercury 150 Verado is $12,650. On the Yamaha side, a 90-hp two-stroke with a 20 ...Fuel System Issues. One of the most common ways your Yamaha outboard motor will break down is a fuel system failure. Whether you’re experiencing an intermittent bog down, poor performance, or complete engine failure, your fuel system is a common culprit. Ethanol gasoline: Only use premium low-ethanol gasoline for your Yamaha …Optimax Pro XS 250 HP. HP/kW 250 / 184. Full throttle RPM 5500-6000. Cylinder Configuration V-6. Displacement (L) 3.0. Fuel Induction System 2-Stage Direct Fuel Injection (DFI) Alternator Amp 60 amp / 756 watt (Belt-Driven) Gearcase Ratio 1.75:1. Steering Big Tiller Compatible.Mercury Outboard Models and Serial Numbers. Updated: Apr 2022 | Category: Identification | Type: Model & Serial Numbers. Find you the table corresponding to the year and model of your outboard and then search the cells to validate your outboard serial number. Note our table contains the starting serial number. Jump straight to: Mercury Manuals.The Mercury 2-stroke spark plugs and compression 100-hour service step begins by removing any plastic covers covering your spark plugs or ignition coils. Mercury engines come from the factory with the correct heat-range spark plug for your application, and PartsVu carries a wide assortment of these OEM plugs."Tom, the cough or sneeze is m "Tom, the cough or sneeze is most likely only a minor adjustment on the carb. I have a 91, 15 horse - over 1500 hours on it (don't use it as much as my pair of 9.9's, basically the same motor as the 15, that have over 2000 hours each), but have had "zero" trouble with any of them (the 9.9's are 86 and 87 models respectively).MODEL YEAR CHART. THRU 1996. Mercury did not publish model year information for 1997 & newer outboards. The year is now normally noted on the serial number sticker. NOTE: Mercury DOES NOT Use Model Years For Parts Lookup. This Chart Is For. Reference Only, Since Many Aftermarket Parts Manufacturers DO List Parts By Year.Re: 1999 90 hp 2 stroke compression numbers, My service manual, OEM Merc/Mariner PN 90-830234R3 publication date Dec. 1997 states in section 1C-6 "Important Information", Compression Check: REMOVE SPARK PLUGS. Install gauge. Hold throttle plate (carb butterflies) at WOT (fully open)The new V8 4.6L and V6 3.4L Pro XS outboards are engineered to satisfy the most demanding people on the water - tournament anglers looking for every advantage they can squeeze out of their equipment. But you don't have to be a pro to appreciate everything Pro XS has to offer - blistering speed, powerful acceleration, legendary reliability ...Compression builds up quickly and evenly, to the specified compression for each cylinder. Piston Rings Leaking. Compression is low, on the first stroke. Consequently, compression builds up with the following strokes, but does not reach normal. And, your compression improves considerably, when you add oil. Valves LeakingMessages. 1. Jun 28, 2003. #1. I recentaly took my 25 hp mercury motor in for a tune up. They said my compression was 120 psi and said it needed to be rebuilt. I was wondering if it realy does need to be rebulit or not? Also, what should the compression be?<br />Serial number: 5805206 (not sure on the year)For a general number scale for compression. Two-stroke engines should be somewhere between 100-120 PSI per cylinder. Then four-strokes are going to be somewhere between 150-210 PSI! This is where the throttle position comes in. On say a 250 HP Yamaha four-stroke. If you do a compression test, (click here to learn how to perform a compression test.Mercury Racing®. Mercury Racing® is known worldwide for its leadership in powerboat racing and production of high performance consumer and race marine products. Manufacturers of outboard motors and MerCruiser inboard engines, with over 4000 dealers in the United States.Loose or damaged parts. Low compression can sometimes be a result of loose or damaged parts. An engine is constantly vibrating which can result in bolts and other parts becoming loose over an extended period of use. As part of your routine maintenance, it is important to check for cracks in the engine, worn gaskets, loose bolts, and spark plugs.The new V8 4.6L and V6 3.4L Pro XS outboards are engineered to satisfy the most demanding people on the water – tournament anglers looking for every advantage they can squeeze out of their equipment. But you don't have to be a pro to appreciate everything Pro XS has to offer – blistering speed, powerful acceleration, legendary reliability ...I had a 1996 merc 50HP four stroke and if I recall it was around 200 or 210 psi peak That motor had the Yamaha power head. Be sure to check at W.O.T. Make sure that the lowest cylinder psi is within 10% of the highest but if you are looking at a 2-stroke, the compression will be much lessOwners Manuals. To easily access an Owner's Manual with consolidated information specific to your Mercury engine - agree to the terms and fill out the form below. To order a printed version of the Service Manual for your particular Mercury Outboard or MerCruiser Engine, click here . I recognize that the literature on this Mercury Marine ...Nov 12, 2009 · Nov 11, 2009. #1. I am looking at buying a merc outboard - 1997 250 hp EFI with an hour meter showing 178 hours. Compression check shows 100,105,100,110,105,100. 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??? 70 hp 1999-2003 5200-5800 2.42 mercury® ®optimax rpm chart ... mercury 4-stroke rpm chart hp/model years wot rpm gear ratio 8 hp 1995-2004 4500-5500 2.00 Mercury Mariner Outboard Forum . What is the compression pressure on a 40hp 2 stroke mercury? ... What should I expect for PSI on a compression check on a 40 hp 2 stroke mercury? Reply. fastjeff Gold Medal Contributor. Oct 19, 2011 #2 120 to 140 is a good range. Jeff . Reply. M. mike1947 New member.#1 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 …Your engine may require different steps depending on factors such as whether it's a two- or four-stroke, has fuel injection, has computers onboard, is hand cranked or has a starter motor, and how its ignition can be disabled. These variations and other issues mentioned below will bear on your ability to do this yourself.

Mercury 40 hp 2 stroke problems, Mercury 115 2 stroke problems, Mercury 60 hp 2 stroke problems. Mercury Outboard Problems. ... 7.5 mercury 7036577 Engine will only start in fwd or reverse with full throttle new rings plugs seals water pump compression good all new gasket and have the shop manual carb ...If your outboard engine doesn't start, run rough or without much of a power, do the compression test on all the cylinders. Low pressure cylinder indicates wo...Suzuki 15 HP DF15AEL5. $4,050.00. $3,140.00. The Suzuki 15 HP outboard motor is a, fuel-efficient four-stroke motor that is ideal for medium to large jon boats, skiffs, and inflatables. The 15 HP outboard engine is a terrific demonstration of Suzuki's engineering expertise, as it's the lightest outboard in its class and one of the quietest 4 ...25 feb 2021 ... Most 2 strokes are 75 , 120 or 140 psi. There is not a certain pattern to follow. The only pattern is 4 stroke always will have more comp then a ...

Mercury 4-stroke Outboard Motor Fuel Consumption Chart | Mercury 25 efi : 2.40 GPH | Mercury 50 efi : 4.65 GPH | Mercury 75 efi : 7.60 GPH | Mercury 90 efi : 10.0 GPH | Mercury 115 efi : 10.6 GPH | Mercury 150 efi : 14.2 GPH | Mercury Verado 200 efi : 19.9 GPH | Mercury Verado 225 efi : 23.1 GPH | Mercury Verado 250 efi : 27.9 GPH | Mercury Verado 350 SCi : 33.0 GPH | Mercury 400R Racing : 33. ...Jan 4, 2008. #3. Re: 1998 EFI 225 Compression. This is directly from the OEM service manual. COMPRESSION All Models - Using a fully charged battery, throttle shutters wide open and cylinder block warm. 110 - 135 psi. (753.3 - 924.5 kPa) Variance between cylinders should not exceed 15 psi (102.7 kPa) D.…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Boasting the honor of the lightest weight outboard in its . Possible cause: Normally your Tohatsu outboard uses a 50:1 oil/fuel mixture (1 pint of o.