Rovan / Rofun R450 45cc Dual Ring Engine suit Baja 5B 5T SC Big Bore Hi Torque Engine 4+HP even more dependant on Pipe used Walbro 1191 aka 1107 Carby NGK Plug 8000 RPM clutch shoes Super Easy Pull Start CMR7H NGK Spark Plug Copper Wire silicon Cap plug Lead This Engine is the Baja Version *Exhaust port is larger than other engines an engine specific pipe header is required or adjusted to suit . The holes centres on the exhaust port is approx 39mm 27mm Exhaust gaskets are supplied …