Scooter Big Bore Kits, Big Bore Heads, Camshafts and Crankshafts

Big Bore Kits. There's no replacement for displacement, and that's even more true for scooters. GY6, QMB139, Vespa, Honda GROM, Yamaha Zuma and Jog, Genuine Roughhouse... All the added power you're looking for is right here. Pair that kit with a stroker crank and a power cam and you'll really be making some juice!