Yamaha 25HP 2006 2-stroke fuel problem

chrisboat1

Recruit
Joined
Dec 17, 2009
Messages
4
I have a 25hp 2-stroke that has a fuel problem. The engine starts on the 2nd or third pull and runs along just fine but after running at medium speed for 2 miles or more the engine then will die out. If I pull out the choke half way the engine will keep running. I have taken the carbs apart and they are both very clean. It seems like the engine is starving for fuel or the fuel pump stops working or there is a blockage in the supply line.
If the engine is not used for long runs there is no problem.

The engine also will sometimes stall when it is brought to an idle after running for a short while.
Finally if you are running along just below plane for a short time then turn the throttle up slowly to start to speed up the engine will almost die out. If you give it plenty of throttle it will get past the flat spot then speed up.
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: Yamaha 25HP 2006 2-stroke fuel problem

sounds like a weak fuel pump,air leak between the pump and the liquid in the tank. a restriction between the pump and the liquid or the tank vent isnt operating correctly.
 
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