do you know what jets fit a stock Yamaha carb?i couldn't find any

i got one more idea a guy i work with had a problem just like this when the engine got up to temp the stator wasn't putting out as much voltage giving a week spark which caused bad performance,sooty plug when it stalled and would not start after it stalled.

so i looked at alitle more things while riding
first speed i found a spot that i could do some speed runs over and over again first run 55mph every run after that wold go down 2 mph from the previous
used a gps and got top speed

second temp after it stalles the case temp has to hit 150F then it will start 1 kick if it is 120f it will not start at all
did this about ten times