My 2000 Grizzly 600 back fired through the top of the motor, flames came up each side of the fuel tank before the bike stopped rolling, and within 2 minutes the fire was 25 feet in the air, the bike burned to the ground. I reported it to Yamaha Motor Corp and delivered the ashes to a local dealer to investigate per Yamaha's request. Yamaha says they have never had this to happen before. I would like to share any comments with Yamaha you may have. Can anyone offer a story to confirm this has been an issue with Yamaha's before?

 

if the quad was BONE STOCK i've never heard of this... i've seen it happen before.. but it is a raret, i hope you get a full replacement..