[Tony the torch]

check the vent hole in the gas cap,if its plugged it can cause the fuel flow to stop when the tank vacuum locks, then after a moment it releases the vacuum and fuel flows again.

 

[Tony the torch]

like Pete says, if you still have the handle bar kill switch they go bad all the time. open up the headlight bucket, find the white and white/yellow wire going up to the handle bars and disconnect the plug and patch them together.