Blue Line Stock Cylinder Kit (57.4); GY6 stage 2 1000 RPM Torque Spring: high-tension

1000 RPM Torque Spring:  high-tension compression spring eliminates belt slip and provides consistent back-shifting during hill climbs

Maintenance Note: If your lock starts to feel sticky

Replace it before it breaks

(# 139433 & 78163)

Review exact family compatibility below:

Blue Line Stock Cylinder Kit (57.4); GY6 stage 2 1000 RPM Torque Spring: high-tensionBlue Line complete 150cc GY6 cylinder kit comes with all you need to replace your burnt up top end. Comes with the cylinder, piston, rings, gaskets, ciclips, wrist pin, and a partridge in a pear tree. Get a matching cylinder head to go with HERE Product is intended as OEM equivalent for listed models. Any misuse, alteration or alternative application is prohibited by law.