GP460 46cc Top End Kit

New from Chung Yang - the 45.7cc big-bore kit for the GP420 engine. This is the stock factory top end for the GP460 engine. 42mm bore, 33mm stroke increases displacement from 41.5cc (GP420) to 45.7cc (GP460) This larger displacement increases engine power by more than 10%, without any loss of top-end RPMs! Also works as a replacement top-end kit for the GP460 engine.  Includes cylinder, piston, piston ring, and snap ring set.