engine trouble

[00tn300ex]

ok last sunday i took my 300ex on a ride and about 2 hours in it started missing and sputtering.i started riding it back to my truck and before i made it there it just died and wouldnt start.wait 30 minutes or so and let it cool down it will start and run fine for about 15 min then start sputtering again.checked my valves adjustment its fine spark plug i slight tan looks like the air fuel mixture is fine.im stumped on this one could it be my coil breaking down my oil cooler is kinda close to it.i really need some help i wanna ride saturday

[Sjorge450R]

this sounds stupid but has made me lose a few positions during two races. Check the vent tube on the gas cap to see if it is clogged. This is do all of the symptems that you are explaining.

[00tn300ex]

it was the coil went by the dealer and got a cheap one just to see and it fixed everything