Mainshaft Wear

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
User avatar
clanger9
Posts: 1165
Joined: Sat Jun 20, 2015 9:38 am
Location: Chester, UK

Re: Mainshaft Wear

Post by clanger9 »

Here are three of the four different mainshafts fitted to Lightweights. Make sure you get the right one!
IMG_1559.jpg
You do not have the required permissions to view the files attached to this post.
1989 Moto Morini Dart 350
1993 Ducati 750SS
User avatar
Ozmadman
Posts: 2651
Joined: Wed Dec 14, 2011 1:02 am
Location: ESSEX UK

Re: Mainshaft Wear

Post by Ozmadman »

just make sure it is the same as yours as there are four different ones 2 for the 250 (old an modified) 2 for the 350 (old and modified)
You do not have the required permissions to view the files attached to this post.
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed
oldandsmelly
Member
Posts: 114
Joined: Tue Aug 30, 2011 4:35 pm
Location: DEVON UK

Re: Mainshaft Wear

Post by oldandsmelly »

I have 3 mainshafts that I found this morning - I may have others, but my 'come in handy' store is chaotic. All 3 I measure as 041263. Two of them are in good condition and one has the same scalloping as in the original post.

If needed, I'm happy to loan one of them as a template.
G15 Roy
Member
Posts: 3546
Joined: Sun Jan 01, 1995 12:00 am
Location: ESSEX UK

Re: Mainshaft Wear

Post by G15 Roy »

Many thanks keep them safe and i will contact you.
Roy
User avatar
clanger9
Posts: 1165
Joined: Sat Jun 20, 2015 9:38 am
Location: Chester, UK

Re: Mainshaft Wear

Post by clanger9 »

Likewise, if you want to borrow either of my later style shafts (041703/043058), just let me know...
1989 Moto Morini Dart 350
1993 Ducati 750SS
User avatar
Martin.S
Posts: 443
Joined: Sun Mar 18, 2018 12:02 pm
Location: Bristol UK

Re: Mainshaft Wear

Post by Martin.S »

Please note that the Norton lightweights also used these mainshafts with the same part numbers - they might be interested in having some made and might bring the price down.
Also would it be cheaper to have a batch repaired - just a thought
Andy51
Member
Posts: 742
Joined: Thu Mar 31, 2005 1:00 am
Location: BERKS UK

Re: Mainshaft Wear

Post by Andy51 »

Hi Martin, I faced wear problems on my B52 'box mainshaft which I solved by getting another from Kempton autojumble for a tenner - not much use to you, I know, but I did some research into the matter - all untried but vouched for by others:
Loctite 660 is specifically for loose splines/keyways. However, it is rather s*** or bust as, once set, the bond can only broken by heating to 250deg C, which will probably damage the shaft permanently.
Strips of shim can be slipped between the splines, but the wear pattern on your shaft would make this difficult. You could try short shim slips to fill the worst wear, fixed with retaining compound. Hope this helps, Andy
User avatar
Martin.S
Posts: 443
Joined: Sun Mar 18, 2018 12:02 pm
Location: Bristol UK

Re: Mainshaft Wear

Post by Martin.S »

I have had crankshaft splines welded up and re machined - whether that can be done with a shaft - welding a little at a time?
Locked