AJS M4 magneto

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AJS M4 magneto

Postby Pmorris » Sun Apr 26, 2020 5:45 pm

Hi I'm struggling to remove Magneto drive sprocket , there's an internal thread in the nut which looks like 7/16 bsf ? But I don't have a bolt , does anyone know how to remove it , is it left hand thread?, I can get a special bolt made if I know what to get . Many Thanks Phil
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Re: AJS M4 magneto

Postby dave16mct » Sun Apr 26, 2020 6:46 pm

Won't you have to remove the nut, then get a 2 leg puller to remove the mag sprocket? The internal thread of the nut won't help you pull the sprocket off, it would have to be in the sprocket (like a twin).
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Re: AJS M4 magneto

Postby Pmorris » Sun Apr 26, 2020 7:25 pm

Hi Dave , I'm struggling to remove the nut , everything is turning - sprocket as well , not sure if something is amiss here, someone has had a go in the past . If I can remove the nut I have a puller to remove the sprocket. Cheers Phil
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Re: AJS M4 magneto

Postby dave16mct » Sun Apr 26, 2020 8:52 pm

Can you make a holding tool from a mag chain to stop it turning while you undo the nut?
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Re: AJS M4 magneto

Postby Mick D » Mon Apr 27, 2020 7:58 am

Hi

If you check the illustrations in the archived parts list you could confirm how the sprocket is attached - if your dynamo is similar to this one it looks like it may be pegged to a tapered top hat sleeve and secured with a washer and sleeve nut:

Mag Sprocket.png


Regards Mick
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Re: AJS M4 magneto

Postby Rob Harknett » Mon Apr 27, 2020 11:30 am


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Re: AJS M4 magneto

Postby Pmorris » Mon Apr 27, 2020 4:52 pm

Thanks for the info everyone, most helpful , I managed to remove the nut (sleeve) by locking up the wheel which turns the Dynamo . The drive sprocket was found to have the woodruff key missing - hence all turning ! Sending it off now to have it checked out and hopefully not too much wrong with it . Could do with alloy end plate if anyone has a spare ?( Wishful thinking ) as the one fitted has been cut in half at sometime ! Cheers Phil.
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Re: AJS M4 magneto

Postby Pmorris » Tue Apr 28, 2020 7:23 pm

Does anyone know what magneto is fitted to this bike and or any info regarding servicing the magneto ?
Philip Morris

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