2008 Sportsman 500 HO EFI Bogging Down
Greetings. Purchased a used 2008 Sportsman 500 HO EFI last year. Ran great until recently, when, after running for awhile and heating up, it bogs down, even to the point of quitting. No overheating light popping on. Fan is turning on. Have not yet looked that closely at how dirty the radiator is, though. Drained and re-filled coolant (figured it was time, and I needed the practice), oil and filter recent changed, air filter in good shape. I'm no mechanic, but I enjoy trying to give it a shot before turning it over to the local shop. Ideas? Thermostat? I've checked other threads and haven't seen anything that fits this condition.
Thanks in advance - I truly appreciate any and all ideas.