Norton Piston Big Four/Big 4 +040 - 1947/54 596cc
10890.040/8217.Q200037+.040
JP Piston Norton Late Big 4 +040 = 83 mm
Gudgeon Pin Diameter: 7/8"
incl. gudgeon pin, circlips and piston rings
S.V
Big 4 No. 1
STD = 82 mm
Piston Clearance 0.12mm or 45thou
Gudgeon Pin Diameter: 7/8"
incl. gudgeon pin, circlips and piston rings
S.V
Big 4 No. 1
STD = 82 mm
Piston Clearance 0.12mm or 45thou
