Well, I spun a bearing because the dealership i bought the bike from failed to mention that they never looked at the motor before selling it to me or to anyone, so if you buy a bike from Britt's Motor Sports in Wilmington, make sure you see them actually do the inspection before you sign the paper work. but yes, i have a 2006 636 and no the last year the made the ZX636C motorcycle was 2006. trust me, I did my homework. and Looking for an engine to replace this one is ****in impossible! I have found many, but most of them are high miles. I spun the bearing on the fifth rod and now that is broke, and umungst other things, the oil filter was not installed when it was sold to me, so the oil light always came on. my first bike, my mistake i guess. but now i am having to pay the price. the part number that was not there when we opened the engine last friday night was 49065 on bikebandit.com. yeah, so if you know of anyone that has a motor sitting around and has some what of low miles on it, let me know. kind of need a motor.