6338 - Full Mod FAT BOY 46cc / 47cc Reed Case Engine - Goped

These engines are built to order and will not ship within 24 hours like parts. Typical lead is about a week but that varies on how busy we are. If this is an issue please contact us prior to ordering for a current lead time. 

Complete fully modified/ported GP460 / GP470 engine for goped use. Engine comes complete with clutch, HDA-223 carb and v-stack. Exhaust is not included and we recommend a Jetpro Rhino pipe to match.Transfer bowls have been modified so that a stuffing mod is not required like a stock case to increase power. Intake tract, reed valve and transfer bowls were in-house flow tested and dyno tested to produce as much power as possible. You can expect to see a lot more torque and mid range power then a piston port GP460 or GP470. We've used high quality carbon fiber reed petals for more power and longer life then fiberglass petals. 

Porting/machining:

intake port filled and 2 boost ports added

piston lightened/reshaped w/dual windows to match boost ports

all ports resurfaced

transfer port bridge knife edged

exhaust duration advanced

exhaust port widened and flowed