Well, A while back I got this bike and it was in pieces, I rebuilt everything, replaced the piston and a whole bunch else.Then I fryed the engine because the power valve wasn't turning, I replaced the piston and the power valve and the head gasket. It started up once but it had really low compression, about 25-50 psi. I recently took it apart and the cylinder looks great and the piston has a great seal. The reed valves are all good, but one thing was that the power valve was getting hung up on one part, I pulled it out and cleaned it all really well, an it now turns but before I put it back together, I wanted to know if the power valve not turning all the way or getting stuck could cause my problems? Also the chambers for the antifreeze had a bunch of whitish gunk all in them, any ideas. I cleaned it all out, but I am just curious about why it is there. Sorry for the long post but I figure any info will help. Thanks everyone.