Hop Up Kit; GX340 to GX390, 420 Predator, & 13/15hp OHV; Stage 2 Our Price: $205.00 Hop Up Kit, 224cc Predator, Stage 1 Our Price: $59.33 Hop Up Kit, 420 Predator OHV & 13/15hp Clone, Stage 4 Our Price: $1,149.00 Engine Kit, 214cc, 2.225 (+.060) Stroker, 2.756 Bore Our Price: $245.00 Hop Up Kit; GX240, GX270, 9hp OHV; Stage 4 Our Price: $886.00 Engine Kit, 218cc for Hemi Predator Our Price: $256.00