Engine Cases (Pair, Long, Big Bore, Custom); GY6 bling Royal Alloy and SYM bikes

Royal Alloy and SYM bikes among others

This OEM-type Mazzuchelli crankshaft fits only the early US-spec Rally 200 (VSE)

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

and smallframes

this will retrofit

Engine Cases (Pair, Long, Big Bore, Custom); GY6 bling Royal Alloy and SYM bikesScooterworks 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