help me

[velocity85]

Hello

I have a problem, please news caused

When speed 5400 RPM speed is constant and when CBS speed over up to 6000
But the engine does not respond as required

Is it a lack of gasoline?

85hp yamaha

[zul8tr]

Wdo you mean "does not respond as required"? You are going to have to provide more specifics.

[velocity85]

Thank you ... Yes, I mean that when speed RBM 5000 be good and steady speed and when you increase the speed over the engine does not respond well where I do not think that the Gas Engine him up good or there is something I know my friend

[zul8tr]

First I am not familiar with the Yamaha 85 hp and can't inspect your engine so some basics things that I would check are:

1 the ignition timing
2 the fuel filter may need to be changed
3 poor quality of fuel
4 spark plugs
5 air leaks at any of the hoses or crank case sealed areas
6 incorrect setting of the reed valves
7 low compression, check it and report results
8 carbon build up on piston crown, rings and exhaust ports, do carbon removal with fuel additive that Yamaha has
9 carburetor restricted and/or set incorrectly