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Sounds like the main jet inside the bowl of the carburetors may be clogged gas tank must be removed, the fuel lines must be changed, and the carbs will need to be taken apart according to the service manual and have all worn parts replaced and reassembled There is a strong chance that the gas tank have some rust developing in it and you will need to either get a new one or have that one treated The reason your bike is able to idle is because the pilot jet is is experiencing a draw from the air fuel mixture circuit and it will do nothing but idle. If you pull the choke chances are that the bike will run, but this is obviously not good for the bike.

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Q: Yamah vstar idles but cuts out on throttle?
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