Hop Up Kit, GX200 & 6.5 OHV Clone, Stage 1 Our Price: $52.31 Hop Up Kit, 212 Predator OHV (Non-Hemi), Stage 4 Our Price: $519.00 Hop Up Kit, 212 Predator Hemi, Stage 1 Our Price: $53.66 Hop Up Kit, 224cc Predator, Stage 4 Our Price: $507.00 Engine Kit, GX270, 292cc (+.160) Stroker, R (2 to 1 Gear Box Cranks) Our Price: $519.00 Engine Kit, GX390/420, 440cc, +.200 Cast Crank, 90mm Cast Piston Our Price: $313.00