Hi! Thanks for reading. So, I bought my dad a used 2007 artic cat 650 4x4. He used it to do chores and check cows no heavy riding. He says one day he was driving along and it died and won't start since. It didn't instantly die it kinda stuttered and that was it. I've briefly looked at it and here's what I can tell. Turns over fine all the valves are moving, has compression, has spark. To me it seems like it is pushing gas back out the carb. When I did ride it seemed the top end was rather noisy?? Any ideas would be appreciated!!

 

I have the exact same problem with my 2008 trv 400.... let me know what you find out.