I have an new SK 70 engine which i ran two tanks of fuel 10% for the break in. What I have found is with the engine cold, turning the prop slowly, by hand, to the compression stroke it stops at TDC, and has a bit of play, then is smooth again to the next TDC. I understand that the chrome brass sleeve is tapered, is more break in required? OS engines don't have this play,,or stop in cycle, is this normal for SK engines?