'02 90hp Yamaha drops power after warming up

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Author Topic:   '02 90hp Yamaha drops power after warming up

shutterbug99 posted 05-08-2014 05:24 PM ET (US)
I put my Whaler in this weekend to give it a run after sitting up for the winter.
It ran extremely well on the trip out, but after it warmed up, it all the sudden lost power, like it dropped down to one cylinder, then after about 10 seconds, it would start to hit on the other cylinders, then after a little jerkiness, it would go back to full power for about 5 or 6 seconds before repeating the process all the way to the dock.
The pattern was pretty consistent time wise.
I'm thinking the carbs need cleaning, but I'd love some opinions.
Dick E posted 05-08-2014 09:02 PM ET (US)
Sounds to me like fuel blockage problem.Maybe in the fuel line coming out of your gas tank or the fuel pick tube in your fuel tank. Ethanol can eat up old fuel lines over time.
Try running on a portable 6 gallon tank with a different hose and see what happens.Then you can narrow the problem down.
rsantia posted 05-08-2014 09:16 PM ET (US)
I have a 2001 Yamaha F100 and experienced a similar problem in the past. My thermostat was defective and was causing my engine to overheat. When the engine overheats the engine is designed to limit the rpm thus cooling down the engine and allowing you to return to port. I did get a warning horn when the engine overheated.
I don't think a fuel problem causing limited engine operation would be linked to only after the warm up period.
Ralph
contender posted 05-09-2014 08:17 AM ET (US)
I think dick is correct, check your fuel pump (the one on the fuel line) replace only with a factory one, then I would look at the carbs. Remember when you finish using your engine for the day disconnect your fuel line from the engine and let the fuel run out of the carbs, let it quit on its own do not shut it off, thanks to our government the ethnol gums up the jets...

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Author	Topic: '02 90hp Yamaha drops power after warming up
shutterbug99	posted 05-08-2014 05:24 PM ET (US) I put my Whaler in this weekend to give it a run after sitting up for the winter. It ran extremely well on the trip out, but after it warmed up, it all the sudden lost power, like it dropped down to one cylinder, then after about 10 seconds, it would start to hit on the other cylinders, then after a little jerkiness, it would go back to full power for about 5 or 6 seconds before repeating the process all the way to the dock. The pattern was pretty consistent time wise. I'm thinking the carbs need cleaning, but I'd love some opinions.
Dick E	posted 05-08-2014 09:02 PM ET (US) Sounds to me like fuel blockage problem.Maybe in the fuel line coming out of your gas tank or the fuel pick tube in your fuel tank. Ethanol can eat up old fuel lines over time. Try running on a portable 6 gallon tank with a different hose and see what happens.Then you can narrow the problem down.
rsantia	posted 05-08-2014 09:16 PM ET (US) I have a 2001 Yamaha F100 and experienced a similar problem in the past. My thermostat was defective and was causing my engine to overheat. When the engine overheats the engine is designed to limit the rpm thus cooling down the engine and allowing you to return to port. I did get a warning horn when the engine overheated. I don't think a fuel problem causing limited engine operation would be linked to only after the warm up period. Ralph
contender	posted 05-09-2014 08:17 AM ET (US) I think dick is correct, check your fuel pump (the one on the fuel line) replace only with a factory one, then I would look at the carbs. Remember when you finish using your engine for the day disconnect your fuel line from the engine and let the fuel run out of the carbs, let it quit on its own do not shut it off, thanks to our government the ethnol gums up the jets...