Hey guys, I will be doing my first top end on my 2006 yz450f next week. I have a lot of hours (prolly about 80-100!!!) on it but this thing still runs like a champ. I have had no REAL problems with it, it's just about that time. It starts and runs fine but lately it has taken a little more than one kick to start it cold:smirk: I am taking it to a friend of mind that has his own engine company and he said that he will give me a good deal on the rebuild. However, he said he has to check the valves and crank and all that to make sure that they are still in usable or good condition. Now, what are my chance sof these things being good to go? Slim? I dont know a whole lot about these engines especially the bottom end stuff. Any advice on what I should do/check or anything will be greatly appreciated.