i will be riding and out of nowhere it dies. I have plenty of fuel and i tried troubleshooting a lot of different possibilities. my spark plug is in tight. etc. im suspicious of an air leak of some sort, simply because my engine had trouble shutting off prior to all this. whenever i wanted to turn the bike off, i would pull out the clutch/disengage it , and it would still be running as if air was still being fed to it.. I would then have to use the kills switch to force it off. any thoughts?