while riding at medium speed through woods,stopped and heard a boiling noise,opened gas cap fumes felt warm,and put ear to tank hole sounded as if were boiling,but cooled off quick,and quit,rode again for a minute,same thing again,bike runs great with no problems,any ideas?

 

Not sure on the Polaris's but the early Grizzly 700's had this issue and it ended up being the vent valve. With a simple larger vent valve it solved the issue!

 

someone else had a post awhile ago about boiling gas as well. i agree maybe a vent issue as i cant imagine that gas would be getting to 212 degrees boiling point w/out having more issues and i dont even think the bike would run. thats just my own thought.

 

pulled bike out by hand and when i stopped i heard the boiling noise,forgot that when the gas gauge quit,i never did get the plastic float out of tank,so when the gas shakes,the float rattles sounds like its boiling,dumb me

 

I remember the early 660 grizzly had that problem and Yamaha had a recall and added vented side panels and a heat shield between the top of the motor and bottom of the gas tank.