Chaincases

Hi John - They did fit a Matchless alloy primary chain-case set-up to the Atlas engine unit on the G15, N15, P11 hybrids in the mid sixties.  So yes it is feasible.  It would probably be best to get hold of a pair of Matchless G9 , G11 or G12 cases as they are often available.  Good luck, Howard  

A NOC  member came to the SNOC event at the Hayes village fair last year with a Dominator 99 to which he had adapted a Commando chain-case. I wrote about it in an article for Roadholder. The Atlas engine that was used in the P11, N15CS series of bikes had a different drive side crankcase to accept the alloy AMC chain-case.