Quad was running okay for a few months after a new starter and solenoid. But would always bog out in top gear, after it bogged out it would start right back up then try to die when you gave it gas in 1st, after a few minutes it would kinda fix itself. Another weird issue it would have is if the gas tank wasn’t above about half way it would die under any load but would idle just fine. But this most recent time I was giving it the beans in 5th and it bogged down, but it hasn’t started since just turns over, got gas and spark, occasional pop if I turn it over for awhile, could this be timing ? Cdi box? Or something else, any suggestions would help me and my buddies are stumped

 

Clean the carb out. Remove jets and blow them and the holes they came from out with compressed air. Check fuel flow from tank. If that doesn't fix it, check compression. Once you get it running again, check the voltage at the battery with engine running, over 15v and the igniter (CDI) box slow cooks, leading to strange faults. Reason for high voltages would be a faulty voltage regulator.