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???The WOT test is done in three simple steps: 1. Find out your outboard or sterndrive's WOT rating. 2. Run your boat at WOT. 3. Replace the propeller with a higher or lower pitch prop. To get the most accurate result from the WOT RPM test, there are a few things you need to do to ensure the data from the wide open throttle test is as precise as ...Excessive Coolant Exiting the Overflow Tube. While it is common for coolant to exit the overflow tube when the bike has been tipped over or when it has overheated, it should not occur regularly. Coolant blowing out the overflow tube is another good indicator of a leaking head gasket. Note where your coolant overflow line runs, so you can keep ...For your engine to operate, it needs Compression, Fuel, and Spark. In order, this is how I would initially check a motor with idle problems (most other issues as well) Compression Test: Check all six cylinders for compression at cranking speed. They should be within 10% of each other. Higher than that, I would visually inspect the cylinders.Short answer: Good compression for a 2 stroke outboard motor ranges from 90 to 110 psi (pounds per square inch) with a minimum variance of 10%. …What should minimum compression be on a 25hp 1975 evinrude what should the compression be on a 2000 8 hp 1976 evinrude 4 stroke whats the minimum compression on a cylinder 1977 evinrude 100 compression check for 5 7 1978 mercruiser marine engine compression ratio on a 1985 5 7l 1979 mercruiser correct compression for 350 1980 mercruiser how to do compression check on mercruiser 3 0 1981 ...Data on the Mercury 2-stroke range has been retained on this page as a reference source: this reflects 2006 production, after the withdrawal of carburetted V-6 models. ... These ultra-smooth three-cylinder outboards with big-capacity 967cc powerheads will provide you with even better acceleration and higher top speed to take you wherever you ...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 LeakingNormally your Tohatsu outboard uses a 50:1 oil/fuel mixture (500 mL of oil for every 25 liter of gas). During the break-in period you should use a 25:1 oil/fuel mixture (1000 mL of oil for every 25 liter of gas). See our oil/fuel chart for more info on the 50:1/25:1 ratios. Tohatsu 2-stroke outboards use TCW3 oil which is specially formulated ...Jason. Marine Mechanic. 24,583 satisfied customers. I have a 60 hp mercury 2 stroke outboard (2004). motor runs. I have a 60 hp mercury 2 stroke outboard (2004). motor runs fine in gear at 2800 rpm, but at any rpm above that motor will shut down. If it is not in gear … read more.I'm looking to purchase a new boat with a 2002 200hp Optimax with roughly 490 hours. I have compression info. Compression by cylinder. #1 - 108 #2 - 108 #3 - 110 #4 - 120 #5 - 112 #6 - 108 I haven't been able to track down definite specs, but one related thread suggested "normal" operating range being from 90-110 psi. I questioned this given ...HOW TO PERFORM 100-HOUR SERVICE ON A 2-STROKE MERCURY OUTBOARD STEP TWO: Spark Plugs & Compression T his 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 …Here you can buy a Yamaha 15 hp 2 Stroke Outboard Engine Short Shaft with a manual starter and tiller control at a low price. ... 2-cylinder. 2-beat: Displacement (cc) 246: Compression ratio: 6.8: Power (hp) fifteen: Bore x stroke (mm) 56 x 50: Range max engine speed: 4500-5500 rpm: Ignition system: Cdi: Purge:75ELPTO. This 75 horsepower Mercury outboard, manufactured in 2003, is a saltwater model. The engine weight is recorded at 305 lbs. This is a 3 cylinder model. The displacement for the pistons is 84.6. The bore for this outboard is 3.5 inches and the stroke is 2.93 inches. This engine has power steering and a electric-type starter.Force DVA and Resistance Charts: 38: Mercury/Mariner DVA and Resistance Charts (Non-Japanese Mariner) 39: Johnson/Evinrude Outboard DVA and Resistance Charts: 40: Compression is the heart of an outboard. If one or more cylinders are damaged due to improper timing settings, lean fuel condition, overheating, or stuck rings from carbon buildup ...EVINRUDE PROPELLERS - SHOP BY 2-STROKE OUTBOARD APPLICATION. Evinrude/Johnson - Aluminum 4 Deluxe-8 HP Pin Drive, 2-Stroke. 4 & 4.5 HP, 1980-1986; 6 / 7.5 / 8 HP, 1980-2005; 7 HP Commercial, 1991-2000 . Diameter: ... Mercury Black Max Propeller; Mercury Bravo Two Propeller; Mercury Laser II Propeller; Mercury Vengeance Propeller;4-Stroke - FourStroke / Pro XS / Verado / Jet Outboard 3 years 3 years 1 year None 2-Stroke DI - OptiMax / Pro XS 3 years 3 years 1 year None 2-Stroke Carb / SportJet 1 year 3 years 1 year None 4-Stroke - SeaPro 40 - 300hp 3 years 3 years 2 years/1000 hours 3 years Mercury Sterndrives & Inboards Limited Warranty Corrosion Warranty Limited WarrantyIf you have a rebuilt or reconditioned oil injected two stroke outboard (excluding Evinrude ETEC or Mercury Optimax) then you'll just need to add 50:1 to your fuel and let the oil injection system add the rest of the oil to make up the balance to get to 25:1. ... , I'd be running the engine at 50:1. 100ML of TCW3 Outboard 2 stroke Oil to 5 ...Outboard Motor Mercury 225 Manual. (155 pages) Outboard Motor Mercury 200 OptiMax Manual. (124 pages) Engine Mercury 200 Pro XS Operation, Maintenance And Installation Manual. (123 pages) Outboard Motor Mercury 200 User Manual. Mercury marine outboard motor user manual (118 pages) Outboard Motor Mercury 115 Optimax Operation And Maintenance Manual.Embrace Possibility. Mercury FourStroke outboard motors are incredibly powerful and efficient, and they feature a wide range of applications. Crafted for less weight and high displacement, they generate abundant torque and immediate power. And because they don't have to work as hard as heavier engines or those with lower displacement, they make boats plane faster and accelerate better, and ...Jan 25, 2014 · 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. 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. Force Outboard Compression. Honda Outboard Compression. Johnson Outboard Compression. Mariner Outboard Compression. Mercury Outboard Compression. Nissan Outboard Compression. Suzuki Outboard Compression. Tohatsu Outboard Compression. Yamaha Outboard Compression.225 HP 2004-2005 5000-6000 2.29 EVINRUDE® 4-STROKE RPM CHART HP/Model Years WOT RPM Gear Ratio 5 HP 1999 5500-6500 2.23 5 HP 2000-2003 5000-6000 2.23 6 HP 1998-1999 5500-6500 2.23 ... 70 HP 1999-2003 5200-5800 2.42 MERCURY® ®OPTIMAX RPM CHART HP/Model Years WOT RPM Gear Ratio 75 HP 2004 Thru 5000-5750 2.33 90 HP 2005 Thru 5000-5750 2.33Attach the pressure gauge hose to the outlet. Seal the inlet firmly with your thumb. Pump the pressure gauge a few times. Release your thumb. If the pressure releases, it’s a clear sign that the inlet is allowing pressure to escape in either direction and the valves aren’t in proper working condition.Are you in the market for a new Mercury outboard motor? Whether you’re a boating enthusiast or a professional angler, finding the right dealer is crucial to ensure you get the best product and service.Jan 20, 2010. #11. Re: 1985 Mercury 115hp 6cyl 2 stroke - Intermittant compression. These engines love to burn pistons. There is an "idle stabilizer" that controls timing that is linked to coil #3. If this unit fails, it can cause mis-timing on your 3rd cylinder and poof, bad piston.Place your engine’s throttle in the neutral position. 4. May sure the key is not in the ignition. 5. Using your torque wrench with a spark plug socket, carefully remove each plug. 6. NGK spark plugs come pre-gapped. If you would like to check the gap, you can do so with a gap gauge.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. A "0" in front of the serial number is ...1987 1993 Mercury Mariner Outboard 2 Stroke 70 75 80 90 100 115 Hp Motors Service Repair Manual Pdf Preview Highly Detailed Fsm Perfect For The Diy ... 2. Install compression gauge in spark plug ...The Pro Max 300X outboard from Mercury Racing cranks out more than 300 horsepower. Rated at more than 300 horsepower, Pro Max 300X is the most powerful outboard on the market. The outboard has an all-new powerhead, from its cylinder block to its high-flow fuel-injection system. The block features high-performance cylinder porting and machined ...Wide open throttle RPM range chart for Mercury powered boats. ... 2: 15 4-Stroke: 1989-2006: 4500-5500: 2: 15 4-Stroke: 2007~ 5000-6000: 2.15: 20: 1986-2005: 4500-5500: 2.25: 20 4-Stroke: 2009-2013: 5250-6250: ... for Mercury Outboards *ALWAYS CHECK YOUR OWNERS MANUAL FOR ACCURATE ENGINE RPM RANGES.Outboard Motor Mercury 225 Manual. (155 pages) Outboard Motor Mercury 200 OptiMax Manual. (124 pages) Engine Mercury 200 Pro XS Operation, Maintenance And Installation Manual. (123 pages) Outboard Motor Mercury 200 User Manual. Mercury marine outboard motor user manual (118 pages) Outboard Motor Mercury 115 Optimax Operation And Maintenance Manual.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.Faulty Impeller. Bad Spark Plugs. Malfunctioning Fuel Pump. 1. Tangled Propeller. If your outboard motor will not throttle up, the issue may be as simple as a tangle. Debris such as fishing line, excessive seaweed, beer can rings, or nearly any other material can wrap around the propeller and its spindle.75ELPTO. This 75 horsepower Mercury outboard, manufactured in 2003, is a saltwater model. The engine weight is recorded at 305 lbs. This is a 3 cylinder model. The displacement for the pistons is 84.6. The bore for this outboard is 3.5 inches and the stroke is 2.93 inches. This engine has power steering and a electric-type starter.Mercury 90HP 2 Stroke cold start, idle, forward and reverse gear engagement, compression testJul 28, 2016 · I have a new-to-me 2004 25 hp 2 stroke Mercury engine that seems to start and run well. During a cold engine compression test, the cylinders both hit exactly the same at 100lbs. My question is: What should the compression number be? This engine is very clean with very minimal use. 1996 Mariner 50HP 4 cyl4 stroke uneven compression: 20: 1983 70 HP compression: 4: New piston rings which one goes on top: 10: 1986 Mercury 25hp piston fitted the wrong way around : 1: Compression spec on 1999 150 2 stroke : 2: Will a coil not fire under compression: 1: LOSS OF COMPRESSION ON 88XR4 150: 5: Putting pistons back in 25 hp mercury ... Mercury Outboard Compression Nissan Outboard Compression Suzuki Outboard Compression Tohatsu Outboard Compression Yamaha Outboard Compression Related Links Enter the Forums Evinrude Forum Directory ... Stroke Switch Tach Tank Tell Tale Test Troubleshooting Used Water Pump Wiring Evinrude Outboards by Horsepower 2 HP 3 HP 4 HP 5 HP 6 HP 8 HP 9.5 ...1995 Mercury 115 HP OB what is good compression? I’m concidering buying a older boat it has a Merc.115HP OB The seller has stated that the engine was serviced in 2011 I’m unsure of what was done? Engine please provide tips to check it’s condition like 1.what is good compression? 2.how will I know if the waterpumps impeller is ...To begin the ignition setting sequence, the mechanic should remove the spark plug as this will make it easier to turn the engine over for piston positioning. Next, the crankshaft must be rotated to give the largest opening of the contact points — typically around TDC. With the points open at their widest, the mechanic should set the required gap.Page 12 SPECIFICATIONS Propeller Information Charts Mercury/Mariner 4 (4-Stroke) Wide ... GENERAL INFORMATION Compression Check 1. Remove spark plugs. 2. Install compression gauge in spark plug hole. ... 25. Prime the oil pump by pouring approximately 1 fl oz. (30 ml) of engine oil into the oil pump inlet side. 4-Stroke Outboard Oil (92 ...Mercury 200 EFI Service Manual (631 pages) Electronic Fuel Injection, Brand: Mercury | Category: Engine | Size: 17.85 MB. Table of Contents. These motors do not have any consistent year-to-serial scheme. Mercury ceased publishing this information after the 1996 model year. There is no way to find the model year of motors with significantly higher. serial numbers than listed in these guides. There is NO serial-to-year cross-reference chart for 1997 and later motors.Symptom 1: Engine Hesitation. Once the outboard reed valve gets damaged or fails to function, it affects the engine performance or outboard motor. During driving or accelerating, the motor will start acting like dying but gradually builds up acceleration. It happens as a failing outboard reed cannot respond to the increased fuel flow.Two-stroke 15-horsepower Mercury outboard motors require a 50:1 fuel-to-oil mixture. However, not all 15-horsepower Mercury outboards are two-stroke engines; many newer models are four-stroke designs.Brucato Power is the leading supplier of replacement ECUs for Mercury Outboard Motors. The Brucato ACU offers 15+ fuel curves that can be customized for your EFI motor application (1988-2001). Tony Brucato has been a pioneer in the outboard boating industry since 1994. He developed the Brucato SVS, an air intake manifold for racing boats ...Safety lanyard (an essential protection feature standard on all Tohatsu outboards) ... Engine: Two Stroke 2 Cylinder Output: 18 hp (13.2 kw) Displacement: 294 cc (17.94 cu.in.) Bore x Stroke: 60 x 52 mm (2.36 x 2.05 in) Starting: Electric or Manual Control Type: Remote Control or Tiller Handle Gear Shift: Forward - Neutral - Reverse ...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. A "0" in front of the serial number is ...If it is running good give it a good decarb and do the compression test again. Get a can of seafoam spray and bring it up to operating temp and at a high idle spray the seafoam in the carbs evenly until it starts smoking real good and quickly shut it down. Wait 1/2 an hour and then start it and run WOT for about 20 minutes.Mercury Outboards Product Handbook - Mercury Marine. This pdf document provides detailed information on the features, specifications, and benefits of Mercury outboards, the world's leading marine engines. Learn how to choose the right outboard for your boat, and discover the advantages of Mercury's innovative technologies and unmatched reliability.OPTIMAX THREE-CYLINDER 115HP SPECIFICATIONS HP/kW115 / 84.5Full throttle RPM5000 - 5750Cylinder ConfigurationI-3Displacement(CID/CC)92.96 / 1526Bore and Stroke (in / mm)3.63 x 3.00in92 x 76mmIgnitionPCM Digital InductiveFuel System2-stage Direct Fuel Injection (DFI)Alternator Amp60 amp / 756 watt Cooling SystemWater-cooled with thermostat & pressure-controlledStartingElectricThis is a question for any Mercury mechanics or anyone else in the know. I have a 95 Mariner 60 that has compression of 105 on top 100 on middle and 105 on bottom cylinder. Seems low to me. Anyone know what it should be and if these numbers are cause for concern.Thanks for any info. No, the numbers are borderline irrelevant.XL. G303046 - UP. 135. 1996. XL. G303046 - UP. MODEL YEAR CHART FOR MERCURY OUTBOARDS MODELS 115 HP - 150 HP.I love my Mercury 4 stroke EFI, nice and quiet and don’t have to mess with a choke. I’m betting your manual says your motor is designed to be used with fuel with 10% ethonol. Jeremy. Participant. Richland County, WI. Posts: 653. May 1, 2020 at 1:36 pm #1939180.4.6L V8 For boaters who refuse to compromise, Mercury V8 250 and 300hp Verado® outboards represent the pinnacle of superior outboard design and performance. They deliver exhilarating acceleration and top speed, with the power and reliability to make runs over long distances and choppy water. The Mercury-exclusive Advanced MidSection …MERCURY MARINE. MERCURY MARINE : MERCURY MARINE 75, 90, 115, and 225 EFI 4-STROKES MANUFACTURED BY YAMAHA MARINE. SUZUKI MARINE: DF70A/80A/90A - 2009 and ...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.#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 …Generally, two-stroke outboard motors should have a 100 up to 120 PSI compression per cylinder. But this is just a rough estimate since you should still try to check using a compression test. In addition, you should avoid having over 10 percent difference between your cylinders. This is very important to prevent problems along the way.For 2-Stroke outboards that require a 50:1 premix of oil/gas we've put together the following chart to simplify the calculations. Use ONLY 2-stroke outboard motor oil with an NMMA (National Marine Manufacturer's Assoc.) certified rating of TCW3. Never use automobile motor oil in your 2-stroke outboard!Choose a range of propellers to perform a water test. Test the props under the same conditions that you would typically use the boat—same load, gear, and water. Set the trim angle so the boat has optimum speed on top of the water. To test the prop, run the boat at WOT and observe the maximum engine RPM on a tachometer.Manufacturers of outboard motors and MerCruiser inboard engines, with over 4000 dealers in the United States. Skip to main content. Dockline Blog ... Mercury Outboards – Durable. Reliable. Powerful. Sterndrives & Inboards. We build Mercury MerCruiser® Sterndrive engines and drives to power your life on the water. Our engines are engineered ...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.Sierra Marine Engine and Drive Products for Mercury/Mariner outboard applications. Read. ... 4/5 2-Stroke (1999 & Up) Mates with 18-80412 ... 2 ring piston are now substituted Chart is for ...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???Performance data you can trust from Mercury Marine. Refine Refine Results () Results per page Engine Horsepower Outboard 500 - 600hp ... Racing Outboard 300hp 400hp 450hp ...HOW TO PERFORM 100-HOUR SERVICE ON A 2-STROKE MERCURY OUTBOARD STEP TWO: Spark Plugs & Compression T his 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 ...60 amp / 756 watt (Belt-Driven) Recommended fuel. Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum. Recommended oil. Mercury FourStroke Oil 10W-30. Engine protection operator warning system. SmartCraft Engine Guardian. Compatible with SmartCraft digital technology. Yes. 115-175 HP Engine Outboard Comparison. Reset. Filter. Scroll right to see all of the products available. Click on the picture to select the ones you want to compare, then click the green "Filter" to compare. "Reset" to start again. 250+ HP. 200-225 HP. 115-175 HP.Mercury Precision 4-Stroke oils feature a blend of high-quality base stocks and additives formulated specifically for use in most four-stroke outboard, sterndrive and inboard marine engines. This oil is engineered to perform well in legacy engines as well as the latest catalyst-equipped engines. Synthetic Blend 4-Stroke (25W-40) Outboard Oil is ...2003 Mercury 90 HP. 90ELPTO. This 90 H.P. Mercury outboard motor was made for the saltwater environment. The piston displacement is 84.6. The bore and stroke are 3.5" and 2.93" respectively. This outboard has starter of the electric type and power steering as well. Your engine's RPM range is important in choosing the right propeller for a given ...Nov 5, 2020 · 2002 Mercury Outboard 150 hp Salt water series 2 stroke engine. Pressure test was performed with hot and cold engine using two different tester kits. One fr... #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 …gboy99. 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. From new it was 140psi. Below are the readings taken during scheduled services since new.2-Stage Direct Fuel Injection (DFI) Alternator Amp: 60 amp / 756 watt (Belt-Driven) Gearcase Ratio: 1.75 : 1: Steering: Big Tiller Compatible Remote: Counter Rotation: Available: Recommended Oil: Mercury OptiMax / DFI Outboard Oil TC-W3: Recommended Fuel: 87 octane compatible (up to 10% ethanol) Engine Protection Operator Warning System: Low ...Increasing Compression On A Two-Stroke Outboard. Generally, two-stroke outboard motors should have a 100 up to 120 PSI compression per cylinder. But this is just a rough estimate since you …I have a 115 hp mercury optimax (2006) with low compression in one of three cylinders. 80 psi, 115psi, ... I have a 1996 Mercury 60 hp 2 stroke running on the top 2 cylinders all have about 115 to 120 psi compression with all 3 plugs out. good spark on all 3 cylinders. when ... 2006 Mercury 115 hp outboard with high speed misfire at 2100rpms ...Mercury/MarinerEFI, 90/115 HP Command Thrust, Optimax and Verado Outboards 135-350 HP. 135-350 HP 1978 & Newer and 90/115 Command Thrust 2014 & Newer. 15 Tooth Spline. Note: Use Flo-Torq IV hub kit (#835257K10) to reduce clutch rattle on 90/115 HP Command Thrust (CT), 135-200 HP 4-Cyl Verado and 150 FourStroke. HOW TO PERFORM 100-HOUR SERVICE ON A 2-STROKE MERCURY OUTBOARD STEP TWO: Spark Plugs & Compression T his 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 …Dec 20, 2019 · Is 120 psi good compression on outboard? 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! You will see a good compression reading of 150-160 PSI. How much should an engine compression test cost? The average cost ... 1995 Mercury 115 HP OB what is good compression? Im concidering buying a older boat it has a Merc.115HP OB The seller has stated that the engine was serviced in 2011 Im unsure of what was done? Engine please provide tips to check its condition like 1.what is good compression? 2.how will I know if the waterpumps impeller is ...Kiekhaefer Mercury Outboard Motors, "K" Models 1940-1952. Model. Designation. Horse-power. Serial Number Range. Year. K1Seloc workshop manual for maintenance, repair and overhaul of Mercury / Mariner 2-stroke outboard motors from the years 1990-2000, including jet drives. Versions: 1-6 cylinders, 2.5-275 hp, with carburettor and injection. This Seloc Repair Manual for Mercury and Mariner outboard motors describes extensively work on the engine and the tail section.Mercury & Mariner Outboards ... late 1990s or early 2000s. 8hp Mercury 2 stroke. JB Honorary Moderator Emeritus ... 45,907. Apr 25, 2012 #2 Re: Proper compression on ...THRU 1996. Mercury did not publish model year information for 1997 & newer outboards. The year , Mercury / Mariner Outboards 2.5-275 HP, 1990-2000 Repair & Service , 115-175 HP Engine Outboard Comparison. Reset. Filter. Scroll ri, THRU 1996. Mercury did not publish model year information for 1, Mercury Outboard NGK Spark Plug Guide. NGK spark plugs are original equipment on many , These new 2.9-litre in-line four-cylinder four-stroke engines use a higher compression ratio to help them deliver, 1995 Mercury 225 HP offshore outboardr unning and compression test, Mercury Outboard Compression Nissan Outboard Compression Suzuki Out, Short answer: Good compression for a 2 stroke outboard motor rang, Below I have listed the oil ratios recommended by manufacturers a, And when a head gasket wears out, it automatically causes, Data on the Mercury 2-stroke range has been retained on this , Mercury Reference Charts. Spark Plugs. 4-Stroke Outboard S, How to Compression Test on Mercury 2-Stroke Outboard Engine N, Messages. 1,055. Jul 2, 2009. #22. Re: Mercury outboard overheating., Mercury/MarinerEFI, 90/115 HP Command Thrust, Optimax an, Modern DFI two-strokes utilize injectors like this one from the, Messages. 330. Aug 4, 2014. #6. Because of the automatic decompr.