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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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  • Motorcycles Master
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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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Posted on Jan 02, 2017

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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.

Oct 07, 2017 | Yamaha Motorcycles

1 Answer

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

May 09, 2017 | Yamaha Motorcycles

1 Answer

20hp 2stroke 05 model can i use pulpfuel


Pulpfuel I wondered what that was. Higher octane petro. I call high test. I will not hurt. No alcohol if possible. Merc., Yamaha, John/Evinrude 2 cycle oil

Feb 22, 2015 | Boating

1 Answer

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


It's a basic yamaha 2stroke eng. there's a drain plug on bottom. Replace with yamaha 2stroke gear oil 1.8 quarts check filter which is located new fuel door. Replace or clean with solvent( replace) never mix oil only one brand should be use at a time. Yahmalube or simial

Oct 04, 2014 | Motorcycles

2 Answers

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 !

Nov 11, 2013 | 2009 Yamaha WR125X

1 Answer

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


sounds like the jet is partially blocked

Jan 10, 2013 | Boating

1 Answer

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.

Nov 01, 2012 | Boating

2 Answers

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.

May 17, 2010 | 2000 Yamaha DT 125 R

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?

Nov 15, 2009 | Boating

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