I just bought an 02 400ex. Ran fine for a few days and now won't idle and pops back through the carb. It also pops some under power. I cleaned the carb, checked for intake leaks and checked for a tight intake valve but no luck. Anyone have any ideas? THANKS!!!

 

got your choke off?

 

Mine did the same exact thing. I posted a couple of post but nothing really helpful. I cleaned the carb out twice so far and it hasnt done it in several weeks.