nah.......you guys are all wrong................."if it ain't broke, then by all means, tear it down and fix it"..........................

we had a guy in our Free Flight Gas club that insisted on reworking any engine that came into his possesion to the point where he'd increase nitro percentage to gain back what he reworked out of the motor..........1 ratail file, rubbing compound and a dremel was all he needed.