Belt Drive

Information relating to the Matchless G9 or AJS Model 20 500cc twin
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Belt Drive

Postby NORSAKI » Fri Apr 03, 2020 11:15 pm

Does anyone know if a belt drive clutch is available for the 53 AJS 500 Twin? Asking for a customer.....

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Re: Belt Drive

Postby JEAN-NOEL » Sat Apr 04, 2020 7:37 am

Hello Kevin, on some bikes with alternator chaincase, and obviously AMC gearbox a belt kit has been fitted. A very expansive job ! New clutch, using Commando parts, spacer between the two chaincase halves, and problem with the crank release valve spitting oïl on the belt...If you add the wet sumping...
Not seriously feasible ! Yes, it is difficult to have an oïl tight tin chaincase, but there lots of topics regarding this problem to solve it on the forum.

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Re: Belt Drive

Postby clive » Thu Apr 09, 2020 7:07 pm

If you fit a belt drive you also have to decide how you are going to lubricate the clutch basket bearing, although there is of course the wet sumping option. .
clive
if it ain't broke don't fix

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Re: Belt Drive

Postby JEAN-NOEL » Sat Apr 11, 2020 10:55 am

Hello Kevin,
just to have and idea you can read an excellent topic : Technical topics - Twin - Dynamo belt drive, published in Jampot November 1997.

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Re: Belt Drive

Postby SPRIDDLER » Sat Apr 11, 2020 1:48 pm

JEAN-NOEL wrote:Hello Kevin,
just to have and idea you can read an excellent topic : Technical topics - Twin - Dynamo belt drive, published in Jampot November 1997.


Kevin. In case you're not familiar with the sections of this website I think this is the article to which Jean-Noel refers:

http://www.jampot.com/article_read.asp?id=222

Norvil produce a belt primary kit for some AMC twins and singles ………..so maybe worth checking with them.
Scroll down to Part No. 069777

https://www.norvilmotorcycle.co.uk/beltdrive.htm

I also found this ref in a search on these Forums but there's no other info. :
".....one guy in Pennsylvania ("Quiet Power Drive") who manufactures complete kits, to include a dry clutch with a sealed bearing".
I poke badgers with spoons.....from 2 metres.

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