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I think most if not all, utility yamahas are belt driven
All Kodiaks from 2000 and on are belt driven. A belt drives the shaft that goes to the wheels. Don't confuse the shaft with the driving mechanism.http://www.motorsports-network.com/YAMAHA/atv2000/utility1.htmKodiaks previous to 2000 were 5 speed gear driven.
I'v been using a Kodiak ATV (named after where i live) for 2 years one some rough trails and have had no problems or complaints about it.