Amc gearbox problem

Information relating to the Matchless G9 or AJS Model 20 500cc twin
User avatar
Posts: 59
Joined: Mon Jun 08, 2015 7:56 pm
Location: Milano, Italy

Amc gearbox problem

Postby sunnybob » Wed May 22, 2019 4:13 pm

Hello Folks,
I have a problem with the gearbox of my 1958 Model 20 (AMC type). I broke my clucth cable and I ordered a new one. Unfortunally some jokers in the past have widened the register hole of the clutch cable (to fit a not original cable) and now the spare cable dances in it :cry: . So I was looking for a used gearbox cover, but the question is: are they all compatible? On ebay there are a couple of ads but they are from Norton Commando or Model 33 ... Are they ok anyway?
Other ideas? I was also thinking of doing nothing. The clutch, even with the register not screwed into the gearbox, works well when fixed. What can happen using the bike without doing anything? Thank you.
Ciao

Roberto

https://youtu.be/f3EAdb92nZE
Last edited by sunnybob on Wed May 22, 2019 5:02 pm, edited 1 time in total.

Member
Posts: 1733
Joined: Mon Mar 24, 2014 5:44 pm
Location: Aberdeenshire

Re: Amc gearbox problem

Postby Mick D » Wed May 22, 2019 4:51 pm

Hi

I'm not sure how consistent AMC's manufacturing process was, you may find a replacement cover will cause problems due to the kick start and gear change bores not aligning well enough.

I would repair the existing cover by fitting a brass threaded sleeve.

Regards Mick

Member
Posts: 2192
Joined: Wed Oct 12, 2005 9:45 pm
Location: N YORKS UK

Re: Amc gearbox problem

Postby 56G80S » Wed May 22, 2019 4:55 pm

Maybe fit a second nut so they can lock together and you won't lose your adjustment while riding?

And then settle for is as is for now?

Johnny B

Member
Posts: 6449
Joined: Wed Sep 01, 2004 12:00 am
Location: WEST SUSSEX UK

Re: Amc gearbox problem

Postby SPRIDDLER » Wed May 22, 2019 5:01 pm

56G80S wrote:Maybe fit a second nut so they can lock together and you won't lose your adjustment while riding?

And then settle for is as is for now?

That's exactly the temporary fix that I did ten years ago when I found that the thread in the outer case was stripped. It's still working fine.
If it 'aint (totally) broke...... ;)
I poke badgers with spoons.

Member
Posts: 868
Joined: Mon Jan 01, 1990 12:00 am
Location: WEST SUSSEX UK

Re: Amc gearbox problem

Postby g80csp11 » Wed May 22, 2019 6:47 pm

if you have pattern clutch levers with the adjuster on the lever fit a Matchless /. Norton P11 cable it does not use the adjuster at the bottom and adjustment is at the lever. the cable sit in the same cover but does not need adjustment at that end

User avatar
Posts: 59
Joined: Mon Jun 08, 2015 7:56 pm
Location: Milano, Italy

Re: Amc gearbox problem

Postby sunnybob » Wed May 22, 2019 7:55 pm

Thank you for your answers. I presume I will go for a "temporary" fix :D as suggested.

Member
User avatar
Posts: 3706
Joined: Mon Jan 01, 1990 12:00 am
Location: LONDON UK

Re: Amc gearbox problem

Postby clive » Thu May 23, 2019 9:53 pm

On a Burman box I used the second nut approach but using a small wood chisel cut about half the thickness of the ally cover to the shape of the nut. It settles in there and is hardly noticeable. The chisel did need sharpening after :roll:
clive
if it ain't broke don't fix

Return to G9 / AJS Model 20

Who is online

Users browsing this forum: No registered users and 2 guests