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How to get more power from 90hp Yamaha 2stroke out

How to get more power from 90hp Yamaha 2stroke out board 2000 model

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Wot exactly are you trying to do ? do you want a better set off or more top end speed ? are those home made cavitation plate finns , if so buy doel finns or symilar as yours look like they mite bend ! you could raise the engine one or two bolt holes , you could spread the weight towards the front of boat , smaller pitch prop to increase set off , larger pitch to get more speed as long as engine reaching max revs still or will bog down but set off will suffer , skim the head to increase compression make sure all carbs clean and balanced and timing correct ! you can make 20mm wedges to fit between engine and transom to increase lift speed at set off ! give me an idear of wot you want if these tips dont help !! P...

Posted on Jan 03, 2014


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I have a 1985 140hp 2stroke Yamaha outboard . When I start it up it runs rough , then when it's at full throttle it stalls and the engine stops.

Take it to a Yamaha marine mechanic and get it checked for compression and a good service. it sound like a fuel starvation problem. It may need a new pump diaphragm, perhaps new spark plugs. It almost certainly needs the carbs balanced.

A two stoke engine will run for a while with out oil, and there is always oil in the tubes that takes a good half hour to empty. There is also oil in the crankshaft area of the engine. There should be an alarm on the oil container that buzzes when it gets low.

You don't want to break down on the water. I have my engine serviced at the end of every season and winterized. It costs me about $125.

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Yamaha 150hp 2stroke, early 2000's. Runs great all day all speeds, but if you accelerate to pull a skier up, there is a total cut out, then recovery.

power side circuit in the carbty , has a blockage or problem in the injector circuit if efi
If carby then have it professionally overhauled by an accredited yamaha service center

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How do i change oil in a 1991 yamaha g2 golf cart

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What can I do

2stroke or 4stroke ? oil in engine or gearbox low ? 2stroke oil low ? if no oil in 4stroke then you will have damaged piston as it needs lubrication but it will have damaged the crank bearings/shells etc ! if 2stroke gear oil then gears and bearings will be damaged , no 2stroke oil will damage piston and crank bearings ! let me know more info and i tell you what to look for !

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2000 90hp Yamaha 2 stroke starts but won't keep running

sounds like the jet is partially blocked

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1985 yamaha 90hp outboard when running does dies out and then is hard to start

on those yamaha engins it is usely the stator thats the problem.

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No spark on yamaha dtr 125cc

Sounds like you are flooding the engine with gas. Put in a new spark plug then twist the throttle one time to prime the cylinder. Now get your hands off the throttle and give it a few kicks. Each time you twist the throttle the power valve gives a shot of gas. Too much can flood the engine quickly.

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1 Answer

I have a 90hp yamaha two stroke, makes a grinding

I had the same thing happen to me this weekend. I tried to slam it in reverse after my dog fell off and it sounds like yours. Have you found anything about the issue?

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