I have a 2004 cr85 expert and ive blown my motor once because the guy i bought it from didnt build the motor right, no motor mount bushings, i now have a new motor with boysenn stage 2 reeds, vortec high comp piston, hotrod crank, and fmf gold series ssr full pipe, its a very reliable bike if you ride it right, letting it warm up and idle for 10-15 minutes can make a huge diffirence in the bikes reliability and performance, i weigh about 130 lbs and the bike pushes me to about 75 mph with ease, overall i live the bike.