Norton Piston Big Four/Big 4 +020 - 1947/54 596cc
10890.020/8217.Q200037+.020
JP Piston Norton Big 4 +.020 82.5 mm
std = 82 mm
Gudeon Pin Diameter: 7/8"
incl. gudgeon pin, circlips and piston rings
1947-54
std = 82 mm
Gudeon Pin Diameter: 7/8"
incl. gudgeon pin, circlips and piston rings
1947-54