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79 yamaha gt80 wont run

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I have a 79 Yamaha gt80 it starts with no problem and runs decent for about 30-40 seconds, if you keep on the throttle about half open and just dies out. Its been sitting for 10 years. Its been cranked over a few times here and there but never rode. Any help would be awesome. Thanks!!

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Have you cleaned the carb?  If it was left sitting with fuel in the bowl for any length of time, the fuel will turn to varnish and plug up the jets and passages.

I would start with cleaning the carb and see if that makes a difference.

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