Gearbox adjuster

Information relating to the Matchless G12 or AJS Model 31 650cc twin
Member
Posts: 209
Joined: Mon Jan 01, 1990 12:00 am
Location: DENMARK

Re: Gearbox adjuster

Postby ajsph » Mon Jun 25, 2018 9:04 pm

DSC01460.jpg
DSC01464.jpg
Here you have 2 pictures of the system on my G11CS

Poul
You do not have the required permissions to view the files attached to this post.

Member
Posts: 290
Joined: Thu Jan 01, 1998 12:00 am
Location: FYN DENMARK

Re: Gearbox adjuster

Postby Ib-Denmark » Tue Jun 26, 2018 6:57 am

Mick D wrote:Hi

Or you can leave the rear wheel as is and just press down on the secondary chain lower run.

Regards Mick


To make sure the primary chain is not getting too hard tensioned I always, as the last thing to do, (before closing the primary box) put in my foot over the lower secondary chain and press it down with all my weight ;)
Ib

Member
User avatar
Posts: 10150
Joined: Mon Jan 01, 1990 12:00 am
Location: ESSEX UK

Re: Gearbox adjuster

Postby Rob Harknett » Tue Jun 26, 2018 9:24 am

The pictures that show the adjuster is all correct. Which I am sure I have used to tighten and loosen tension. I was a bit puzzled why you said it only worked one way. As I had never had problems adjust the primary chain. It will not move both ways, if you have not first loosened off the rear chain.

Member
Posts: 193
Joined: Sat Jan 14, 2017 11:48 am
Location: WEST MIDLANDS UK

Re: Gearbox adjuster

Postby bob121 » Tue Jun 26, 2018 6:01 pm

Rob Harknett wrote:The pictures that show the adjuster is all correct. Which I am sure I have used to tighten and loosen tension. I was a bit puzzled why you said it only worked one way. As I had never had problems adjust the primary chain. It will not move both ways, if you have not first loosened off the rear chain.


I don't have what's in the photos. Mine is mounted to the inside of the lhs engine plate and only pushes against the box. Only moves it forward. But I may as well work out the part numbers and fit what's in the photos. Thank you.

Member
User avatar
Posts: 10150
Joined: Mon Jan 01, 1990 12:00 am
Location: ESSEX UK

Re: Gearbox adjuster

Postby Rob Harknett » Tue Jun 26, 2018 7:46 pm

ah that explains, if correct parts are fitted tighten the rear lock nut, will tighten the primary chain. Un doing the front nut will loosen the primary chain.

Member
Posts: 209
Joined: Mon Jan 01, 1990 12:00 am
Location: DENMARK

Re: Gearbox adjuster

Postby ajsph » Tue Jun 26, 2018 9:00 pm

the adjuster inside the engine plates is correct for the standard model, the system in the pictures is for the CS model, but can be used on the standard models.
Poul

Member
User avatar
Posts: 10150
Joined: Mon Jan 01, 1990 12:00 am
Location: ESSEX UK

Re: Gearbox adjuster

Postby Rob Harknett » Tue Jun 26, 2018 11:08 pm

I relate better to singles Paul. The adjuster pictured looks like that which is used on singles for many years. Pre and post war. I have a 63 twin CSR but cannot recall what that has. Perhaps the centre type I am not aware of and I have not seen it.

Member
Posts: 327
Joined: Tue Oct 24, 2017 11:05 am
Location: DEVON UK

Re: Gearbox adjuster

Postby MalcW » Wed Jun 27, 2018 8:39 am

bob121 wrote:I don't have what's in the photos. Mine is mounted to the inside of the lhs engine plate and only pushes against the box. Only moves it forward. But I may as well work out the part numbers and fit what's in the photos. Thank you.


My 1960 D/L is like that.

Malc

Member
User avatar
Posts: 2211
Joined: Mon Oct 05, 2009 12:00 am
Location: ESSEX UK

Re: Gearbox adjuster

Postby 1608 » Wed Jun 27, 2018 2:21 pm

My 1960 D/L G12 has the adjuster shown in the photo that moves the box to and fro. I believe that is the standard one.

Member
User avatar
Posts: 2653
Joined: Mon Jan 01, 1990 12:00 am
Location: HAMPSHIRE UK

Re: Gearbox adjuster

Postby ajscomboman » Wed Jun 27, 2018 4:04 pm

1608 wrote:My 1960 D/L G12 has the adjuster shown in the photo that moves the box to and fro. I believe that is the standard one.


Afraid not, the adjuster for a 60 G12 will be an inside fit on the drive side engine plate and will be only on that side with a long headed bolt which engages into a recess on the gearbox.

PreviousNext

Return to G12 / AJS Model 31

Who is online

Users browsing this forum: No registered users and 8 guests