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bike starts, runs for varying ammouts of short time, sputters and dies. then it starts back up, then shortly afterwards dies, starts. over and over. i have replaced all four circuit breakers, checked all the connections, have drained the tank, cleaned the petcock and fuel-filter. problem continues. any ideas?
 

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I'd start it with the gas cap open. If it doesn't die out you know it's a problem with the tank vent.

Next I'd check the vacuum line to the petcock.

Does using the enrichener have any effect on the problem? Is the knob staying out when you open it and try to start the bike?

If there was a lot of crud, rust, or water in the gas, or it was old, like Dods suggested, then the next place I would look is a clogged carburetor circuit or water in the carburetor bowl.
 
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