Planning to swap awful seizing disc brake for earlier drum version over winter. I have an earlier cush drive wheel and brake and swinging arm to suit, question is how to progress.
So does earlier swinging arm fit onto mk3 cradle?
Or would I be better cutting brake anchor lug from drum brake swinging arm, then slotting mk3 arm and welding it in.
I put gear lever on correct side many years ago, so standard brake lever and cable on left is plan.
However there may be issues I have not yet considered and suspect others have considered this in the past so any information is welcome.
Regards
Martin Freeman
Yes, the drum brake swing…
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Cush Drive Rear Wheel
Unfortunately Martin, I'm not convinced that the later factory drum cush design is very effective when compared to the MK3 setup, as the pads are so small, so effectively you will end up having minimal cushioning in your power train? Got to be slightly better than none at all mind.
I reckon a better engineered alternative is the Madass version, designed to fit, but that is $$$'s of course:
https://tritonmotorcycleparts.com/297620484/297620488
You might be able to adapt a rear wheel cush drive hub from a different marque? I've heard of the BMW 650 single cylinder hub being adapted, plus with guaranteed spares availability, but you'll no doubt need machining facilities.
My ideal would be a cush drive front engine sprocket, (like the one Norman White produced prior to his retirement), together with Don's rear drum hub. IMHO the Commando transmission needs as much help as you can provide it with unless you are a gentle rider or have completed the fantasy and fitted a 5-speed TTI gearbox.
Me and my MK3 - I'm also considering swapping the pedals over, bit I'm sticking with the disc rear wheel, and don't have the brake seizing issues that you mentioned.
I'm intrigued that you have been running around with your hydraulic rear brake pedal swapped over to the left side - could you indulge me/us with a photo please?
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Yes, the drum brake swing arm will fit Mk3 engine plates.
Modifying the Mk3 swing arm to accept the drum brake will entail more than 'just' welding on a brake stop (which would be better fashioned from a piece of new steel rather than ruining a perfectly good pre-Mk3 swing arm).
I have all the parts you would need convert a Mk3 to drum brake (from a Mk2A), maybe we could work out some kind of swap?