I have a 03 sportsman 600 roughly 4500 miles and 550 hours. Runs great around the yard and cruising down the road. I can creep through the mud no problem but as soon as I give it more throttle the quad starts bogging out. I will stop and put it in neutral and after about 20-30 seconds of idling and reeving it the quad will run great again.

It seems as if the quad loses power when under load and above 1/4 throttle to sum it up. Runs great down the road however.

Any help will be appreciated, thanks