So i just did a top and bottom end rebuild (piston, rings crank, rod, bearings etc) and now all of a sudden I have a bad tick. Note that the head is fine, and off the original LIFAN 125. So let me explain, My clutch got stuck engaged, rather than cracking the case open I got a bottom end off another motor and assembled. (there where no spare parts after). Valves were adjusted to .003 (intake) and .005 for exhaust. Timing is correct, runs and has tons of compression. I even put a different head on, and the valves adjusted on that one aswell. I can not for the life of me figure this out. Motor experts of the interwebs i need you!