Engine Cases (Pair, Long, Big Bore, Custom); GY6 bling and smallframes

and smallframes

ZNEN 150cc

Royal Alloy and SYM bikes among others

It uses a Fresh Pack design — the acid cartridge is kept separate until activation

Also fits the Genuine Urbano 50i

Engine Cases (Pair, Long, Big Bore, Custom); GY6 bling and smallframesScooterworks offers our exclusive pair of Custom Big Bore Engine Cases for GY6 long engines. We machine these in matched pairs ourselves, and we bore them up to 63mm, big enough to fit a 63mm performance cylinder kit. Go big! Pick up a new crankcase gasket while you're at it. Specifications: Matched right and left sides Stamped serial numbers ensure you have a matched set Dimensions: 10"L x 10"W x 4"H Compatibility: 157QMJ based 125cc 150cc 169cc