RACE PORTED GP460 46cc Top End Kit

This kit has been RACE PORTED - intake, exhaust, and transfer ports have been professionally enlarged/reshaped for more fuel/air flow and hence more power.
This 45.7cc replacement top end for the GP460 engine has a 42mm bore, 33mm stroke. Also works as a replacement top-end kit for the GP420/GP460 engine. Includes cylinder, piston, piston ring, and snap ring set, as pictured.