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1984 yz80 trouble?

This is a discussion on 1984 yz80 trouble? within the YZ forums, part of the Yamaha category; when i go to give it gas it will rev way up and when i let go of the the ...


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Old 12-12-2008   #1
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Default 1984 yz80 trouble?

when i go to give it gas it will rev way up and when i let go of the the throttle it will still rev for about 5 seconds and sometimes longer. i cleaned out the carb and made sure that the throttle inside the carb went up and down smoot and it does. so if anyone knows what might be wrong please let me know, that would be great.
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Old 12-12-2008   #2
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could be running lean, try richening it, check the spark plug condition and adjust accordingly
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Old 12-30-2008   #3
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does it have some kind of return spring that is not tight enough? I think the YZ (2 cycle) had an adjustable throttle block or plate (the thing inside the carb) had an adjustable spring that was adjusted from the top of the carb with the cable. Might have been the Enduro?
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Old 01-18-2009   #4
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Floats are bad, or the float level is too high.(Getting too Much fuel?)
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Old 10-04-2011   #5
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have you checked for air leaks between the carb and the reeds. if that intake has a small leak it will rev high and run bad
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Old 10-07-2011   #6
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To check for air leaks use something like gasoline or strating fluid. Something that can be sprayed around the suspect area. The engine will either rev or die depending on the severity of the leak. An air leak can be caused by the crank seals also. More details are avialable if an air leak is not detected around the intake.
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