DDM stocks a full line of parts for the Chung Yang GP420 engine with 40mm cylinder bore, and Chung Yang GP460 engine with 42mm cylinder bore. For scooters: The GP420 comes stock on the GTR40 Trail Ripper, SGSR42R, and Super Go-Quad 40. The GP460 comes stock on the GTR46 Trail Ripper, SGSR46R, Super Go-Quad 46, and Trail Ripper Quad 46. Both can also be fitted to the GSR25, GSR26R, GSR29R, and Super Go-Quad 30 when used together with the 78mm motor mount assembly. Select the products you need.