1979 kx80 wont run right - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-21-2006, 08:02 PM
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1979 kx80 wont run right

I have a 1979 kawasaki kx80. It does not run like it should. It tries to die at high rpms after a couple minutes of riding it after that it wont even rev up. I have cleaned the carb and checked the gas line and put in a new cdi box. Changed the spark plug also and it runs the same with the old cdi box and the new cdi box.

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post #2 of (permalink) Old 04-07-2006, 11:06 PM
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Re: 1979 kx80 wont run right

Sounds like some kind of fuel delivery issue to me- like maybe leaning out and dying? I don't know much about the old KX80s. Reed valve problem perhaps? I don't think they did any of those exotic power valve exhaust sytems in those days...

You might try locating a shop manual and looking if it has a troubleshooting section. It might give you some more basics to look at.

Also, you said that you put in a new spark plug. You might get some clues if you pull it out and look at it- the color of the insulator can tell you a lot about how your bike is running. Also, keep a close eye on things like what the exhaust is doing when it dies. Does it smoke really blue (loading up), or is it putting out almost no smoke at all? A good running 2 stroke should give just a bit of blue under acceleartion, but shouldn't necesarily smoke like a bee-killer. [img]/ubbthreads/images/graemlins/smile.gif[/img]

Anyway I don't know much about those sorts of bikes, but that is what I would kind of do- look for symptoms and try to track them down. You may also try a compression test to be safe...
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post #3 of (permalink) Old 04-13-2009, 11:22 AM
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i also have a 1979 kx80 with the same problem..i have not yet torn it down to see what exactly it is but a friend told me it is probably a worn out rod bearing.
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