GY6 3.5mm Stroker Crankshaft

This is our ProBld 3.5mm stroker crank shaft. This crank is generally used with a 63mm big bore kit. If you are running a 63mm big bore kit with the stock crank shaft you have a 180cc engine. Add this 3.5mm stroker to make it a 190cc. keep in mind you will need a cylinder spacer, longer timing chain longer cylinder studs and a low profile timing chain tensioner. We have a all inclusive kit for that. This listing is for the people that only want to purchase this crank with nothing else. This crank is much much better quality than stock. It's balanced for way less vibration and has much better bearings. Don't forget to pick up crank seals and gaskets. If you haven't already bored your engine cases for the 63mm bore, we have the case boring tool as well. Listed belowEngine fitment is for a GY6 QMJ157.