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My 01 ZX9R will turn over 110,000 miles on the way home from work today. Can't believe how perfectly the engine still runs. I replaced the head at around 90,000 miles because I ran out of valve adjustment and a used, low-mile, head was cheaper (125 bucks) than new valves, but the bottom end is still all original and perfect. I installed my 27th front tire, 5th set of plugs, 12th set of front pads and 5th (maybe 6th??) battery; and did my 22nd oil change (Mobil 1 15W50) yesterday.