This Magneto Cylinder / Stator Housing applies to (but is not exclusively used for) GY6 125 - 150cc ATVs, dirt bikes and scooters. CFW-125YX, CFW-150YX. Inner Diameter (ID): 90mm Outer Diameter (OD): 109.4mm Overall Height: 45.6mm Center Hole Mount (Tapered): 14/18mm Mounting Holes: 5mm