BSA Pre-Unit Singles "Big End" Assembly (1) - B31 / B33 / M20 / M21 / Etc (PRE - 1959) Reprint Fits the BSA A65 Lightning

Fits the BSA A65 Lightning

Rod is sold individually

Threads have a Diameter of 1 3/16"

Guides are suited for BSA A50 / A65 twins (Lightning

Please review measurements for proper fitment

BSA Pre-Unit Singles "Big End" Assembly (1) - B31 / B33 / M20 / M21 / Etc (PRE - 1959) Reprint Fits the BSA A65 LightningWorn big end? Bottom end making a "knocking sound"? Chances are your big end is in need of replacement! Replace your big end with our new high quality English made complete big end assembly's. Comes included with pin, rollers, race, nuts, etc. threads are 3 4" OD Works with connecting rod part #'s: 66 483, 65 1614, 66 481. Fits all BSA pre unit singles (B31, B32, B33, M20, M21, M22, etc) from approx 1937 1958. Check your parts book to ensure the best