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25 hp problem plz help

jamesstant

New member
"G'day
i have a yamaha 2


"G'day
i have a yamaha 2 stroke 25hp, it has ran fine for the last 3 years however it has started to lose power and doesnt go any faster then idle speed, the engine still starts ok and when warming up and flusing the out engine it runs ok but back fires after reving.
i have changed the water pump, cleaned the carbi, replaced spark plugs and fuel. and nothing has happend, the engine is still in extremly good condition. does any body know what is wrong? plz help im dying to get bak on the water."
 
Run a compression test on all

Run a compression test on all cylinders and see what they are. I'm unaware of what they should be in psi. Just to rule out anything internally inside the engine.
 
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