So with the throttle closed, held closed by hand, does it still over-revs as soon as you start it up? If that's the case, disconnect the top spark plug wire and restart it, if it doesn't over rev, the issue is the upper crankshaft seal. This is a fairly difficult job so I would suggest seeking out a marine mechanic unless you are very mechanically inclined.
SOURCE: relay switch for power tilt for Johnson outboard motor 40HP
Hello jalbin0308, I may can help but "NEED MORE INPUT" said ET. Model, year, HP, ect.
SOURCE: 40hp 1987 yamaha outboard motor will run for 30-60
Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.
SOURCE: 1999 Mercury Mariner 9.9hp outboard motor
should be on the side with a lever but could you give me more info please
SOURCE: 35hp Johnson evinrude outboard not running at full potential
Hi, did you buy your engine used? Sounds like your gonna have to get the carb or carbs cleaned. Its possible you could have a stopped up fuel filter, or not enough spark but i am guessing its gonna be the carbs. They got some gunk in em i bet. Probably old fuel turned to gunk from setting up. I had the same problem on my 40 horse.
Testimonial: "Hi, thank you very much for your help, I will strip the carb down and have a look. Once again, many thanks, I am very greatful"
SOURCE: 3.5 mercury outboard stalls when put into forward
hi take the prop off see if there is anything /string/ between the hub and the housing check oil lvel in g/box /is gear box nice and free if all is ok try it in ware with just a small amount of choke
drain /empty fuel out replace with fresh /correct oil mix
check /change fuel filter/air filter
warm engine up check idle mixture ajustment/tick over speed
increase idle speed slightly/7/800 rpm
hope this helps merlin v 12
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