The AMC gearbox

deshollier · Post by **deshollier** » Thu Oct 25, 2007 11:51 am

While looking for sources of useful information for the upkeep of my Commando, I came across a US based supplier who has a really excellent range of articles on restoration/overhaul. What has this got to do with AMC products you might ask. Just remember the shared AMC gearbox. If you are about to overhaul yours or just want to know a bit more on the workings and adjustments, take a look at www.oldbritts.com/ob_new_bike.html Go to section 8 and take you pick. The articles are very helpful and the photos are superb.

lawrence · Post by **lawrence** » Thu Oct 25, 2007 6:06 pm

Superb. Really easy for a novice like me to understand too.

Biscuit · Post by **Biscuit** » Sat Oct 27, 2007 11:38 am

Note the method of securing the K/S spring, much better than the AMC boxes I have met. Was this, I'll call it a mod., fitted to AJS/Matchless?

PGGuse · Post by **PGGuse** » Sat Oct 27, 2007 12:04 pm

quote:
Note the method of securing the K/S spring, much better than the AMC boxes I have met. Was this, I'll call it a mod., fitted to AJS/Matchless?

Yes. I think this mod was introduced in the early 60s

Biscuit · Post by **Biscuit** » Sat Oct 27, 2007 12:11 pm

That means I have repaired at least two bikes with the wrong gearbox!!!!

PGGuse · Post by **PGGuse** » Sat Oct 27, 2007 12:16 pm

quote:
That means I have repaired at least two bikes with the wrong gearbox!!!!

It's no particular feat to make the modification by yourself, provided yo have a grinder, a drilling m/c, a lathe and a hammer available - and the spring with the big loopEdited by - PGGuse on 27 Oct 2007 11:37:12 PM

Biscuit · Post by **Biscuit** » Sat Oct 27, 2007 1:10 pm

If they were my bikes I probably would do this.

I did notice that the new springs from JSL have longer legs that go in that, often enlarged, hole.

matman · Post by **matman** » Sat Oct 27, 2007 10:36 pm

quote: Just remember the shared AMC gearbox. If you are about to overhaul yours or just want to know a bit more on the workings and adjustments, take a look at www.oldbritts.com/ob_new_bike.html Go to section 8 and take you pick. The articles are very helpful and the photos are superb.

There also exists an excellent video/DVD with Mick Hemmings completely dismantling and rebuilding an AMC (in this case: Norton Commando) gearbox, also explaining the difference between the Norton and the AJS/Matchless-type.
As far as I know this very helpful item is available at the Norton Owners Club (I only have stored a copy on my PC). Recommended!!

bag-o-nails · Post by **bag-o-nails** » Sat Oct 27, 2007 11:50 pm

Have a look here too

http:www.britishonly.com/tech/manuals/workshop.asp

Norton ETC, LUCAS Archives

snatchpiece · Post by **snatchpiece** » Tue Oct 30, 2007 10:17 am

The site with the gearbox info is superb, is the box identical to the one on my G12 or is it just similar? I hope I never have to work on mine, but in case I do this info will be helpful if it applies.