Motorcycle Repair: 1978 yamaha special 400, yamaha 400, fuel atomization

Question
what would cause my 1978 yamaha 400 to quit running and wouldn't restart until it cooled off?

Answer
Hi Steve,

Q:  "...what would cause my 1978 yamaha 400 to quit running and wouldn't restart until it cooled off?"

A:  Excessive heat may cause....

Fuel vapor ventilation problem
Excessive electrical resistance
Poor fuel atomization/combustion
and more...

Respectfully,
Mark Sihvely