Hey guys , i just recently purchased my first grizzly its a 2007 700 . But im already having problems with it , on my first ride after about 20 min it started to spit and sputter and even stall . Next day i replaced the sparkplug , drained the gas and put new shell v power with an OZ of seafoam . Went out on it for about 45 min and seemed to run good so i thought i fixed the problem . Went out again today and about an hour in my ride it started doing it again , would spit and sputter (backfire) and stalled a couple on the way home . Any ideas what this could be ?