[Firemandave]

Hi:

I have had this ATV for 30 years . Amazing bike. Up until last year I had zero problems. It runs perfectly when running. After about an hour of running it just quits. Still have spark but wont start until cooled off again.

Any thoughts

 

[Here 2 help]

If it has spark but won't start - it's either compression (unlikely) or a lack of fuel (more likely) - check the fuel tank venting, fuel flow through petcock, then fuel line (sometimes ethanol blended fuel will swell the inside of the fuel line restricting the flow) and the float bowl vent on the carb. If it were losing spark until cooled, then I would suggest the stator as a problem, but you say you have spark, so if it's not compression, look for a fuel problem.