I just purchased a 2005 660 Grizzly with 150 miles on it. It runs great except at low speeds idling along and sometimes when you let off the gas the engine pops. Sounds more out of the carb not out of the tail pipe. Any ideas ? Thanks

 

run some Seafoam through it, sounds like a dirty carb.

 

I have heard of sea foam but never used it. Do you pour it in the tank or what. I did put some gas treatment in the tank and changed the plug , but that did not fix it