Yamaha 40 3cyl

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ruger243

Recruit
Joined
Jun 12, 2010
Messages
4
I have a Yamaha C40 two stroke 3cyl. It runs good at idle and mid-range, at wide open throttle it loses RPM's. No water in the gas, and it's not sucking air into the fuel line. What else could cause this.
 
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robert graham

Admiral
Joined
Apr 16, 2009
Messages
6,908
Re: Yamaha 40 3cyl

Check entire fuel system for restrictions, vent on tank, fuel pump, fuel filter, then you may need to remove and clean carbs for plugged jets.
 
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ruger243

Recruit
Joined
Jun 12, 2010
Messages
4
Re: Yamaha 40 3cyl

There are no restrictions, all of the fuel lines are new the portable fuel tank is new, Fuel pump is new. I'll try to rebuild the carbs A.S.A.P.
 
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