- Dec 3, 2002
I'll be rebuilding my 02 CR250 soon and I'd like to tune it. What are the ideal specs for piston protrusion and squish clearance? I'm assuming it has grossly excessive squish clearance that is easily remedied simply by milling the head. Is there a standard "just shave X mm off the head" for more compression at high altitude? Race gas is not a problem.