BSA Piston B33/M33 1954-60 std.
Made in Italy
STD=85 mm
middle gudgeon pin to Crown 48 mm
Gudgeon Pin 19mm
Piston Clearance 0.12mm or 45thou
for short rod
Compression Ratio: 7.25:1
65-1613 Conrod
Cmp Hight 43mm+5mm dome
with Piston Rings, Circlips and Gudgeon Pin
Triumph Screw Countersunk Head 1/4" Whitworth UNC x 11/32" UH Slotted Screw Warning: if you use book 11, 1970 this is not the correct part. The screw you need has 2BA and part no.: 82-4129