TWIN CYLINDER CRANKSHAFT RECESSED NUT 5/16" BSC

LONG RECESSED CRANKSHAFT NUT USED ON ALL TWINS PRIOR TO 1971 WHEN THE SYSTEM CHANGED TO ALL STUDS AND UNF THREADS.  THE EARLIER SYSTEM CONSISTS OF TWO OF THESE NUTS FITTED TO THE LOWER PAIR OF BOLTS, TWO STUDS 067553 (NMT2086), SIX NUTS 067533 (NMT2031), FOUR BOLTS 067535 (NMT2033) AND TWO DOWEL RETAINING PLATES 067534 (NM2032).


IN LATE 1972 THE CRANKSHAFT FIXINGS WERE RE DRAWN AND CHANGED TO SIX STUDS AND 12 NUTS UNF THREAD.  THESE CAN BE USED ON ALL PRE MK3 TWINS.  THE 850 MK3 (ELECTRIC START) USED 3/8" FIXINGS.  FOR ANY PRE MK3 TWIN REQUIRING A FULL SET WE WOULD RECOMMEND PART NUMBER CSFK-E.