I am finishing up my top end. I had to remove the cylinder and head to inspect the piston/cylinder wall. The cylinder/piston and head are back on. I put my cams back on and cannot get the cam chain on. I put one cam back in (tried both individually) and do not have enough chain to get the other one installed. I rotated the crank several times while watching the lower sprocket. Everything looks OK. The plastic cam chain guides look OK and appear installed properly. I am absolutely dumbfounded. When I rolled the cam to YZ specs, I also had a tough time, not enough chain slack. I ended up having to remove the cam caps on both intake and exhaust to tilt both cams enough to get the chain over the sprocket. The bike ran correctly last week, so I know everything was OK. It is bizarre. With both cams installed and the chain over one sprocket, it appears there is physically not enough chain to even fit OVER the second sprocket. Something is wrong and I am clueless. The tensioner is not installed, if you are wondering. Any ideas?? Kevin ------------------ 99 WR, 84 Kaw 900 Ninja, '82 Honda CB750F clothes hanger, '84 Honda Z50 "Berm Destroyer". Always thinkin' "Hell, this worked on my 2 stroke!!"