G80 Dynamo sprocket

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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G80 Dynamo sprocket

Postby Phil H » Fri Feb 05, 2016 6:24 pm

Hi,
Can anyone tell me how many teeth should be on the dynamo sprocket
I am off to the Carole Nash bike show tomorrow & hope to find one.

Thanks

Phil.

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Re: G80 Dynamo sprocket

Postby GOLDSTAR » Fri Feb 05, 2016 6:50 pm

whats it for, arn't the single's different to the twins? kind regards

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Re: G80 Dynamo sprocket

Postby Stuoyb » Fri Feb 05, 2016 8:24 pm

17 teeth.
It needs to be able to take rhe lock washer see the picture on the parts website part no. 000725

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Re: G80 Dynamo sprocket

Postby Rob Harknett » Fri Feb 05, 2016 9:55 pm

17 teeth and the same sprocket used on a single manual mag since at least mid 1930's. But you do not use the key special nut clip and washer on the mag. As Stu says, you must use those fittings on the dynamo. Prior to about 1951 new pt. no. 000725 was
STD 725. Should be plenty about, Used on all singles for about 20 years. On both mag and dynamo.

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Re: G80 Dynamo sprocket

Postby Phil H » Fri Feb 05, 2016 10:19 pm

Thanks Guys,
Take the note on the lock washer.

Regards

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Re: G80 Dynamo sprocket

Postby clive » Fri Feb 05, 2016 11:38 pm

Really surprised to read the same sprocket used on the mag and dynamo. Not so on my bikes. The dynamo has the two slots for the special washer, and the mag does not. Tried to look it up on the Archives but its not working. Anyone else having that problem?
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Re: G80 Dynamo sprocket

Postby dave16mct » Sat Feb 06, 2016 12:06 am

The dynamo sprocket is deeper, has 2 or 4 (?) slots for the special locking washer and 2 flats for a spanner. I can't remember if it's 2 slots or 4. (Its 4 slots , just looked it up in the archives. So they're working for me Clive)
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Re: G80 Dynamo sprocket

Postby clive » Sat Feb 06, 2016 12:12 am

You are right it's 4 slots and the key way for a woodruff key, not fitted on the mag sprocket.
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Re: G80 Dynamo sprocket

Postby Rob Harknett » Sat Feb 06, 2016 12:45 am

Looks like I had my prewar AJS head on. I Checked, the post war AJS did have a different sprocket STD 726. As I have only prewar AJS, I guess that's why all the I have are the same.

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Re: G80 Dynamo sprocket

Postby GOLDSTAR » Sat Feb 06, 2016 8:15 am

just to be different, the two I have, only have two slots, so there! kind regards

don't matter much so long as you can use the locking washer!

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