I've got a 1999 Kawasaki KX100 2-stroke. This thing flat out rips. Full FMF pipe setup. Too many after-market parts to list. Absolutely no problems. Jetted for high elevation but we have a low elevation jet that will go with it. Brand new front and rear fenders. New Renthal chain and sprockets put on 3 mnths ago. Not much wear on them. The front tire about 70% tread left and rear tire has about 30% tread left. Air filter and oil changed about once a month. $1200 o.b.o. Call 1-(970)-, or ask for Dale and come check it out. Thanks for looking