Hop Up Kit, 224cc Predator, Stage 2 Our Price: $251.00 Engine Kit, 263cc for Tillotson 76mm Block, Stroker Kit Our Price: $273.00 Engine Kit, GX390/420, 440cc, +.200 Billet Crank, 90mm Forged Piston Our Price: $894.00 Engine Kit, GX270, 292cc (+.160) Stroker, R (2 to 1 Gear Box Cranks) Our Price: $519.00 Engine Kit, GX390, 414cc, +.160 Honda Crank, 88mm Cast Flat-Top Our Price: $485.00 Engine Kit, 180cc, GX160 + .160", Stroker Kit Our Price: $297.00