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Hi Roderick:
I'm not familiar with your engine configuration, but on some of the older bikes, vibration eventually can cause a wire to break in the coil. When the engine is cold, the wires make contact and it runs, but as soon as it gets hot, the connection is broken or compromised and the spark quits or drives you crazy.
Since your bike runs when cold and quits when hot, I'd be looking for electrical rather than fuel problems.
Hope this helps.
You need to clean the idle speed control valve and the throttle valve, they are most likely sludged up, use carb spray, do it with the enginge at high idle speed, after you are done disconnect the batt. for 5 min. and the reconnect, drive a few miles and your problem should go away.
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