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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.
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