I have a 99YZ400F that i have been putting back together for a while, got to the point where I'm putting the cam chain on. I get the chain over one cam sprocket, go to put it over the other cam sprocket and the chain is so tight that it pops both cams out of there journals. I checked, and double and triple checked that the cam guides are in correctly and that they are the correct ones even. The chain tensioner is not even installed, i have ordered two other cam chains from rockymountain ATV and both have come up to short.
I cannot find any specs as to what the stock chain should be, so i have no base to go off of. The chain that came off the bike, when you lay it out and pulled like you would an old fan belt to find the length, measures 14 7/8 inch, the chains im getting from rocky mountain atv are measuring 14 3/4 inch.
I have a hard time believing that this thing stretched that much!?! but I am no expert.
any advice guys!?! I have no idea where to go from here...