Hop Up Kit; GX240, GX270, 9/11hp OHV, & 301; Stage 2 Hop Up Kit; GX340 to GX390, 420 Predator, & 13/15hp OHV; Stage 1
Engine Kit, GX390, 414cc, +.160 Honda Crank, 88mm Cast Flat-Top Hop Up Kit; GX240, GX270, 9/11hp OHV, & 301; Stage 3
Engine Kit, GX390/420, 440cc, +.200 Cast Crank, 90mm Cast Piston Hop Up Kit, 212 Predator OHV (Non-Hemi), Stage 4