Questions? Looking for parts? Parts for sale? or just for a chat,

The WD Motorcycle forum

WD Motorcycle forum
Start a New Topic 
M21/21 Alternator (?)

I know that this is the Holy of Holies and a great sin to do, but just for the fun, knowledge and experiment – did some one installed an alternator instead of the original dynamo?

Re: M21/21 Alternator (?)

M21s had an alternator fitted for the last 3 years of production (1960-63, Engine prefix BM21A )...These were 'to order only' for the Automobile Association...

They still retained the dynamo, the alternator being used to power a radio set...

The drive side mainshaft was altered to accept the alternator rotor, thus losing the engine shock absorber assembly...This was moved to a Triumph type 4 spring clutch...

The alternator stator was carried on a separate aluminium carrier mounted within suitably modified steel primary chain cases...Of course you could use the alternator B Series cases if you modify the footrest mountings on that side (I did that when I fitted alloy cases to my '51 rigid B33)...

I think I still have a crank and M21 steel cases somewhere, though not the stator carrier...

I fitted an alternator on top of the magneto a few years back in a (complicated) one off housing I machined up...It worked well for a few minutes ( ) until the dynamo clutch burnt out.. ...Ian

email (option):

Nieuwe pagina 1