Hey

I am working on a 2001 400 sportsman. The last time we had it out the valves were clanking so we were told to put a bit of 2 storke oil in the gas so we did. On that ride the quad started losing alot of power so we headed home dong a max of about 20mph, further we travelled, slower it would go it would only go a max of 5 mph time we got home. We only had about a 3 Mile ride home. It idles fine and will rev a little bit, but soon as u tromp on the throttle it will bog like no other. I dont know if the 2 stoke oil had anything to do with the insadent but I would sure like to know were to start on this thing. Thank you.

Chris