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Dec 26, 2015 · 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 ... 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 WarrantyWe have 2 Mercury 15 TwoStroke manuals available for free PDF download: Operation, Maintenance & Installation Manual Mercury 15 TwoStroke Operation, Maintenance & Installation Manual (108 pages) Brand: Mercury | Category: Outboard Motor | Size: 3.41 MB1996 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 ... If 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 ...2 stroke modern outboards have lower compression levels especially at low crank levels due to lower compression ratios and very low supercharger effect from pistons/crankshaft lobes at low cranking rpms. 2 stroke air cooled engines, even less cranking compression psi. Sealing tolerances when cold. what E. says in their service manual:The 30-plus Yamaha four-stroke outboard engine range kicks off with a 2.5hp portable outboard and tops out with an apex predator, the 425hp V8 XT Offshore 5.6-litre V8 launched late in 2018. The engines come in different performance bands, starting with the 2.5hp to 70hp models, the 115hp to 200hp in-line four-cylinder models, the 200hp to ...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 ...Tips for Repowering Older Boats. Tips for repowering older boats: Scuppers above the waterline ensure drainage. Wide chines are one way to help float heavier power. Brackets with more immersion provide more buoyancy. Boating Magazine. Also, four-strokes are losing weight, which should help when repowering an older legacy boat.2001-2005 Mercury/Mariner 2.5HP thru 225HP Repair Manual. 2001-2001 Mercury/Mariner 50/60 4-Stroke Repair Manual. 2001-2002 Mercury/Mariner 115HP EFI 4-Stroke Manual. 2002-2007 Mercury 40/50/60 HP 4-Stroke Repair Manual. 1965-1989 Service Manual Application: 2 hp To 40hp 2 Stroke 1 & 2 cylinder engines.Attach 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.Disassemble your engine and replace the joints as well as the rods and rings. You just need to repair and replace any items that have failed. You should also change the head gasket and tune the cylinders. When repairing a two-stroke outboard with low compression, you should consider the expense of the work.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 ...PAR Yacht Designer/Builder. Yeah, HP is HP, though a modest weight penalty in 4 strokes, they'll still produce the bollard pull they're rated for. More directly, if you have a 1 ton boat with a 90 HP outboard, it'll run in the 37 MPH range, given a reasonably shaped hull form. The same hull with a 110 HP outboard will get to about 40 MPH.Re: 2002 Mercury 150Hp xr6 Compression and overall reliability of outboard From Mercury 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)1980-1999. 40 HP - 70 HP. To sort chart by column (Year, Model, etc) click on the desired column heading. You may ignore any letters before the horsepower designation, and those after any of the following model numbers that match yours (e.g. your 6 HP model # BJ6R4SOSM would match 6R4SOS in the chart, ignoring the " BJ " and " M ") 40 HP.Sep 20, 2008. Messages. 12,345. Aug 9, 2011. #9. Re: Break in of a 2stroke outboard. Just follow factory break in procedures and you'll be fine, check your owners manual for that and use 25:1 gas/oil ratio for first 10 hour break in. You can add 50:1 gas/oil ratio on top tank's 10 hour mix leftovers. Happy Boating.E-TEC Direct Injection with stratified low RPM combustion mode. Alternator Output. 133 Amps Total / 50 Net Dedicated. Steering. Remote (Tiller accessory) Trim Method. Trac-1 Power Trim and Tilt. Shaft Length - in (mm) 20 (508)Best Answer. Copy. i have a 70hp Mercury outboard older late 70's model and the cylinder compression is 135 across the board. it shouldnt be below 100 psi and not more that 15 between any 2 ...Compression Test 101. 12-03-2016, 11:49 PM. In a different thread townsend had mentioned a compression test, which had me thinking. If you were to google "how to perform compression test", for every link that provides instruction there are just as many conflicting procedures. Some say ground the plug cap, some don't.The TwoStroke line includes the highest displacement engines in their horsepower classifications, plus they give outstanding power to weight ratios for best performance at …

Mercury 200 EFI Pdf User Manuals. View online or download Mercury 200 EFI Service Manual. Sign In Upload. Manuals; ... Starter Circuit Troubleshooting Flow Chart(Centrifugal Bendix) 119. Flow Chart (Continued) 120. ... Outboard Motor Automobile Engine Marine Equipment Motherboard.Re: Compression for 50 HP Merc 4 stroke. Sounds severely overpropped to me, but there isn't enough info to be sure. RPM at top speed is critically important. It should be at or near 6,000rpm and I don't see that happening at 27mph. With a 22" pitch I would expect near 40mph at 6,000rpm. To resolve it, you need a tach on your engine, at least ...114lbs Good Condition, 20" Long Shaft, Tiller Model, Manual Start. Two Stroke. This is a great running 25hp Mercury long shaft outboard motor with compression of around 125psi even. This 25 hp Mercury is a 2-stroke and has a manual start. This is a very desirable motor as it is the 2 stroke 114lbs model. We have fully boat tested this engine ...1-218-326-4223. 7 SW 10th St. Grand Rapids, MN 55744. Mercury Motors Nobody makes a more reliable, powerful, and efficient lineup of outboard motors than Mercury. Mercury outboards are built to go the distance. Mercury offers the most-complete line of outboard power, for fishing boats and speed boats, for pontoons and tenders, for work and for ...Mercury Outboard NGK Spark Plug Guide. NGK spark plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance. Please view the application guide below. You may also find the NGK spark plug code helpful. Model.

Moreover, wiring diagrams are absolutely critical when performing electrical repairs, testing or when a wire color code chart is needed. In summary, these are a few reasons why you should download a Mercury outboard repair manual. You never know when or if you might need one. ... I need a workshop manual for 2008 Mercury 5hp 2 …Find your recommended Mercury/Mercruiser marine engine oil and filters here...see charts below. See our Oil & Gear Lube Capacity Charts for proper amounts. 2-STROKE OUTBOARD OIL APPLICATION CHART. OIL. Low HP: 2.5 HP -. 30 HP. Mid HP: 40 HP -. 115 HP. High HP: Above.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.…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. 1987 1993 Mercury Mariner Outboard 2 Stroke. Possible cause: 1969 6cyl 1250hp outboard Mercury manual #42. Dan more (Thursday, 15 June 2023 ..