My sons quad (Raptor 80) starting acting up. It seem to bog and back fire when its warmed up. Runs great when cold. I pulled out the air cleaner , pulled the carb to clean the jets, put in a new spark plug, drained the gas and put in newer gas. And still has the same problem.
Any suggestions???

 

check your choke. sounds like the problem

 

adjust the valves?

 

Fix It!!! found a plug up against the exhaust on the inside. So when the exhaust heated up it was melting wires and shorting.

Thanx!!!

 

glad you got it fixed.