Lower Mount: M8x1
and 100cc 4-stroke engines using the following factory designations:
Bolt Hole Spacing: 79mm
and steel head gasket fit Series A short-case engines only (cylinder head stud spacing = 54mm)
It mounts to the frame using the factory tabs on the frame of your scooter
Mazzuchelli, Crankshaft; VLB,VLA,VBB,VBC,VNB,VNC gearset Lower Mount: M8x1Crankshaft for VLB, VLA, VBB, VBA, VBC, VNB and VNC. Made by Mazzuchelli for non injected motors. This crankshaft is an upgrade over stock, not a performance upgrade. It's a reliability upgrade! Same stroke, better construction.