My Gen 1 has just gone 117,000 kms. I just gave it a birthday - new tyres - S21 front, T30evo rear, new sprockets 16F, 44R and chain - XW ring RK gold, new brake pads - Goldfren sintered, new oil and filter, and K&N filter. Plugs are still good, no lack of power, only a little bit rattly at idle - hardly surprising given the kms and I need to check the valve clearances soon.
I was loving the way the bike felt... for 66 kms... then it died.
After a bit of diagnosis, we pulled the immersion fuel pump out of the tank. And the high pressure hose between the fuel pump and the fuel filter has burst. Waiting for parts to arrive from AF1 Racing now. Reading the service manual, its a service item every four years. There's absolutely no sign of any loctite anaerobic sealant on the o ring on the fuel pump so I have to assume it's never been done. Sigh...
A mate has lent me his 2007 Aprilia Tuono R for the meantime. It's nice... but I really prefer my Gen 1. It's a lot more animal and raw, and the lowered gearing is a heap more fun.