My 05 999 set for 4 yrs (crashed) and I have put over 4000 hard miles on it this summer with the same belts that came on it. I turned 12000 miles this weekend on it and might change them this winter. I know where there are 2 998's that have never had the valves adjusted or new belts put on and they both have over 20,000 miles on them. They get abused at track days and all day riding adventures. Change oil every 2500 miles and put gas in it is all we have done to them. They still make great power considering what they have been through.
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