1996 Yamaha 225hp fuel issue?

[Asainz320]

Hey guys! Long time no see lol.
I have a little problem with my engine. When Im docked and the engine is running, it shoots raw gas from the exhaust I can see films of gas being formed in the surface of the water. Then when I leave dock and we are under way it doesnt stay at full throttle for long. When I give it full throttle it gets 5500 RPM but after a short time it drops to 4000 RPM and it stays there for the whole trip. No over heating or anything. Any ideas on what can this be?
I already rebuilt the carbs, and the fuel pumps. I also checked the spark plug electronics and they check out fine so I'm out of ideas.

 

[jeffersondodson561]

Re: 1996 Yamaha 225hp fuel issue?

Provide model number.

 

[Asainz320]

Re: 1996 Yamaha 225hp fuel issue?

Ox66

 

[99yam40]

Re: 1996 Yamaha 225hp fuel issue?

That is not a model #

 

[Asainz320]

Re: 1996 Yamaha 225hp fuel issue?

225turu?

 

[99yam40]

Re: 1996 Yamaha 225hp fuel issue?

That looks close to a model #, is there anything in front of the 225?

 

[Asainz320]

Re: 1996 Yamaha 225hp fuel issue?

L225turu

 

[99yam40]

Re: 1996 Yamaha 225hp fuel issue?

sounds like you still have a fuel pump leaking extra fuel into crankcase, a carb flooding, or you are loosing spark on 1 or more cylinders.
How did you test the ignition system components?

 

[Asainz320]

Re: 1996 Yamaha 225hp fuel issue?

I have the manual for this engine and with an ohm meter checked that all electronic components were up to specs, the sparkplug caps, the coils, etc....

 

[99yam40]

Re: 1996 Yamaha 225hp fuel issue?

Best to check peak voltages with a peak reading meter made just for these ignition voltages or a DVA adapter and regular meter like the manual states to make sure it is not dropping spark.
A inductive timing light will show spark problems some times if you hook to the different plug wires