Rear drum/sprocket differences (52 18s)

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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Rear drum/sprocket differences (52 18s)

Postby uktom77 » Sat Oct 17, 2020 6:17 pm

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Evening All, I have two rear drums/sprockets to choose from. On the face of it they look the same. One has better teeth and I’ll be going with that one, but ....... before I do, does anyone know what the difference is? One is clearly marked A2 and the other A3.


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Re: Rear drum/sprocket differences (52 18s)

Postby Rob Harknett » Sat Oct 17, 2020 6:59 pm

010293 seem to be the same. Other numbers could be production batch or mould casting numbers. So if any faults are found they know where to look.

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Rear drum/sprocket differences (52 18s)

Postby uktom77 » Sat Oct 17, 2020 7:21 pm

Thanks Rob, it's a shame the first one has a blob of something (I tried getting it off) over the casting no. Making me unsure of whether they were the same no. or not.

I'll continue to clean up the one with good teeth.


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