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