G9 DYNAMO

Information relating to the Matchless G9 or AJS Model 20 500cc twin
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moley
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Joined: Sat Jan 01, 2000 12:00 am
Location: EAST SUSSEX UK

G9 DYNAMO

Post by moley »

I AM IN THE PROCESS OF RESTORING G9 BUT I HAVE NOT GOT THE CORRECT DYNAMO FOR THE BIKE. i HAVE A DYNAMO THAT WOULD FIT THE TWIN BUT IT HAS THE RUNS THE WRONG WAY FOR THE BIKE.

SOMEONE TOLD ME TO SWAP THE COIL WIRES OVER.. WHICH I HAVE DONE AND KNOW IT APPEARS TO RUN THE CORRECT WAY FOR THE BIKE.

IS THIS OK TO DO THIS OR WILL IT DO DAMAG[:I]E TO THE DYNAMO..

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Biscuit
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G9 DYNAMO

Post by Biscuit »

Andrew, by 'running the wrong way' do you mean the polarity of the dynamo is reversed. If this is the case there is a paragraph on Page 135 of the manual (obtainable from the Club) on how to reverse the polarity under 'Converting to Positive-earth System'



Rohan B.
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Joined: Wed Oct 12, 2005 10:45 pm
Location: AUSTRALIA

G9 DYNAMO

Post by Rohan B. »

Strictly speaking, the armature is (apparently) wound to suit the direction of rotation - the coils slightly lead (or trail) the commutator segments for whatever magnetic/electrical reason.

Spinning the plot the other way supposedly reduces the efficiency, but shouldn't cause any other problems (?).

Local rewinder gave me full chapter and verse some years back, but the electrons seem to have drained out of my memory bank... Anyone ?

hth,
Rohan.

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