I have a 1951 C Rapide and would like to time the valves with a degree wheel. I can only assume the bike has the original cam lobes but have not pulled them yet. I have read about the Mk 1, 2 and 3 cams and would like to know how I can tell which ones I might have, as the timing appears to vary with each. Are they stamped? Alternatively, are the cam measurements published somewhere which will allow me to identify mine, please?


'74 Commando - Interstate
"74 Commando - Hi-Rider, possibly
'65 Atlas, mostly anyway
'15 R1200 GS Adv
'51 Vincent Rapide
'58 Ariel Square Four