So my cylinder is done(per Kens Cycle Tech.). The top looks like the coating is pretty thin and you could feel the slightest ridge at the bottom from the pistons lowest point of the stroke. My Yamaha manual says: Cylinder tolerances - 3.7402” to 3.7406” Mine measures- 3.739” Piston tolerances- 3.738” to 3.739” Mine measures- 3.736” Piston to cylinder clearance- 0.0016” to 0.0026” With max @ .004” Mine is- .003” I know I am pretty much at my limit as far as piston to cylinder clearance. But why are my parts worn out but still measuring smaller than the factory specs. I am going to get it replated through Millennium but I am curious as to what they would final bore it to. It is an OEM piston.