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I have a 2008 ktm exc 450 and recently replaced the head gaskets and now Im checking the valves. After rebuilding everything up to this point, id been able to get the camshaft with timing chain to slide into place just fine. But after removing one of the rocker arms to put a valve shim in, the cam will no longer slide all the way in. It stops with about 1/4 inch left and it feels like theres a fluid pressure preventing it from goin the rest of the way. I can force it if I try hard just enough to get the plate on the gear portion, but its not enough to screw tight. Did I mess something up? How do I get it to slide in like i did before?