Is it possible to fit an aluminium alloy chain case to a heavy twin? Either to a Model 7 or an 88.
I'm thinking a chain case from an AMC twin or Commando? Or might there be something else? For what I have in mind either an alternator chain case or not.
Hi John - They did fit a…
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Chaincase
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.
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Yes John - I should have…
Yes John - I should have said that a bit of alloy welding and light machining will be necessary to mate the Matchless inner chaincase to your Dommie crankcaes. Similarly the outer may need some work to fit with your Dommie footrests. Cheers, Howard
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Thanks...
...for the replies. I'm pleased it can been done.
Some background, I'm thinking (dreaming) about my next project, I'm looking for a pre-unit 500cc twin, dynamo electrics, spring frame and alloy primary chain case. That last requirement may have ruled out a Norton, the Model 7 and 88 are back in the game!
I don't want a Triumph pre-unit so the choice will come down to AMC's G9, Model 20 or a BSA A7.
Ultimately, price and condition may well be the deciding factor.
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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