I have a 2000 with Toomey t5 pipes, Toomey Radiator, stainless impeller, amp link, I removed the airbox and had the carbs drilled outand run straght k&n filters. I ride very hard and lots of dune riding, I have been mixing a 32:1 ratio since 2000 and I am still on the original piston. It still runs very very strong and starts on the first kick. I usally run Yamaha 2r oil...