1985 Yamaha moto4 will not start when hot
 

1985 Yamaha YFM200n

Does any one have any suggestions for me?

ATV starts (electric) fine when the engine is cold or just a little warm but will not start when the engine is hot, like after it has been run for a while then shut off.
It will start fine cold with the choke on, flip choke off and it will idle forever. Engine runs good throughout the entire RPM range and it never falters even at idle. But....after the engine has been run a little while it will not start until it cools down a bit. Then it will start and do fine until it is shut off again. The electric start works fine but it just will not "hit" when trying to start it with a hot engine.
I've adjusted the valves and made sure the carb is clean, float is correct height but it's doing the same thing!!

Any ideas?