took my cylinder to a machinist friend of mine and had it honed out.. said he took about 1 thousanth of an inch off so it should still work with stock piston. it measured 2.703" or 68.656mm that gives me 0.005" - 0.006" of clearance if i buy a 0.020" OS piston if I understand this correctly? is that too much? how should I go about doing this? should I buy a 0.04" OS piston and get the cylinder board out to tighter clearances? i pretty much know nothing about this and I'm having a really hard time finding an online service manual. thanks in advance for the advice.