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GPM Slipper
Diam. 86 mm
9.5:1
Pin Diameter: 19mm
BSA Piston 250cc C10/C11/C11G/C12 +040 = 64 mm
BSA/Triumph/AMC Ball Bearing 6205
Triumph/BSA Ball Bearing Crankshaft
BSA Engine Sprocket B31,B32,B33,B34,Gold Star.M20.M21.M33/ 23T. 4-Lobe
BSA B40 piston +20