Actually, that's not true. I had a catastrophic failure of the final drive on my 2003 650, and when I bought a replacement on eBay, I was bidding against another guy who'd had the same problem. I'd go for a chain or belt final drive in an instant. A chain running in an enclosed oil bath would last forever, and would probably be lighter.Butch said:Never fix what isn't broken. The present system works fine & there have been no problems so leave it alone!