whereas on this replacement
Softer Spring = Less belt tension + lower RPM transition
Vento Phantom Optimized: The exact factory-spec upgrade for the Vento Phantom series
and steel head gasket fit Series A short-case engines only (cylinder head stud spacing = 54mm)
Mazzuchelli, Crankshaft; VLB,VLA,VBB,VBC,VNB,VNC gearset whereas on this replacementCrankshaft 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.