I've been told around 100 hours of regular riding time. With the Nikosil cylinder you can just replace the piston with a pro-lite because they have better lubing and lighter, well or just replace the rings but either way freaking cheap to keep like new!!!
DO NOT ORDER FROM YOUR KTM DEALER they will overcharge you at least $40 buks on a wisco piston kit... I know from experience. Either go to rockymountain or some other sites and it will be cheaper and usually quicker shipping.
__________________ Two Stroke & Diesel Smoke  <---- DUNE ADDICT
NEW!!! 2007 KTM 250 XC-W: FMF Gold series Fatty, FMF KTM series Turbine Core2 sparky, bark busters, case saver, jet kit
91 KTM 300 MXC: FMF Gold Series fatty pipe, pro taper bars, devol guards, Boysen stage 3 carbon fiber reeds, Pro lite piston (8-10-07), new powervalve guts (o-rings, bearings, cleaned and greased), new 38mm PWK to top it off with a JD Jet kit
SOLD, GONE, MIA
'84 Honda 250r ATC
'82 Honda 250r ATC
Two 81 KX420s
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