1965 G2CSR Clutch play

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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1965 G2CSR Clutch play

Postby ColourNcoat » Wed Nov 11, 2020 10:06 am

Started work on the engine and on the primary drive.
I have done plenty of reading regarding the early and later models concerning the single and duplex chain and casing and the play in the clutch.
Could someone tell me or send me links with regard to solving these problems.
I have duplex gears on primary but single chain fitted.
Also I have play/movement in the clutch and it was suggested that larger bearings fitted to take up the play.
Any help as to where I can get these parts would be greatly appreciated. I can see the engine has been worked on and would like things to be right from start.
Thanks again and stay safe all.
Regards Roger

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Re: 1965 G2CSR Clutch play

Postby clanger9 » Wed Nov 11, 2020 11:31 am

Hi Roger,

Could you clarify "play/movement in the clutch"? Is it wobbling on the shaft? In that case you need to replace the clutch centre. It's available from club spares.
If you have duplex gears, then you should fit a duplex chain. Also available from club spares.
1989 Moto Morini Dart 350
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Re: 1965 G2CSR Clutch play

Postby ColourNcoat » Wed Nov 11, 2020 12:00 pm

clanger9 wrote:Hi Roger,

Could you clarify "play/movement in the clutch"? Is it wobbling on the shaft? In that case you need to replace the clutch centre. It's available from club spares.
If you have duplex gears, then you should fit a duplex chain. Also available from club spares.


Sorry, I would say it is the bearing ring. What part of the clutch centre would wear?
You can see where the chain has been touching the inner casing.
Are there any measurements I can cross reference with my Mic?
The engine has been worked on as the piston is fairly new and the valves are new. The right main looks to have movement which is under investigation.
Thanks very much for the reply

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Re: 1965 G2CSR Clutch play

Postby clanger9 » Wed Nov 11, 2020 12:09 pm

This is likely to be the clutch centre. It is very prone to wear. When worn, the clutch wobbles on the shaft.
Here's comparison of a worn one and a new one.

IMG_1291.jpeg


Easiest way to check is to take the clutch basket off and have a look. While the clutch is off, you can see if there's any play on the gearbox input shaft. It is likely to be fine.
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1989 Moto Morini Dart 350
1993 Ducati 750SS

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Re: 1965 G2CSR Clutch play

Postby ColourNcoat » Wed Nov 11, 2020 12:43 pm

[quote="clanger9"]This is likely to be the clutch centre. It is very prone to wear. When worn, the clutch wobbles on the shaft.
Here's comparison of a worn one and a new one.

IMG_1291.jpeg


Easiest way to check is to take the clutch basket off and have a look. While the clutch is off, you can see if there's any play on the gearbox input shaft. It is likely to be fine.[/quote

I have to be to be honest mine doesn't look that bad. The rubber absorber looks a black mess. Disintegrated more like but the spines look ok. Still trying to do pictures lol.

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Re: 1965 G2CSR Clutch play

Postby ColourNcoat » Wed Nov 11, 2020 12:50 pm

I have just checked the g/b input shaft and there is play in the shaft bearing.
Roger

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Re: 1965 G2CSR Clutch play

Postby clanger9 » Wed Nov 11, 2020 12:52 pm

If the shaft is wobbly, it could be the plain bushes inside the output gear.
Hopefully it's not the big roller bearing, because this is expensive (and you need a decent track on the output gear...)
1989 Moto Morini Dart 350
1993 Ducati 750SS

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Re: 1965 G2CSR Clutch play

Postby ColourNcoat » Wed Nov 11, 2020 1:12 pm

clanger9 wrote:If the shaft is wobbly, it could be the plain bushes inside the output gear.
Hopefully it's not the big roller bearing, because this is expensive (and you need a decent track on the output gear...)

It can't get much worse. The main bearing is worn but has to be done now lol.
Will take box apart in a bit.
Thanks very much for your input excuse the pun.
Will update later.
Regards Roger

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Re: 1965 G2CSR Clutch play

Postby clanger9 » Wed Nov 11, 2020 1:22 pm

Good luck! :beer:

I wrote a guide on overhauling the Lightweight 'box - the bits on the output bearing & gear might be helpful:
https://www.ifixit.com/Guide/AJS-Matchl ... 77#s258666
https://www.ifixit.com/Guide/AJS-Matchl ... 77#s171888
1989 Moto Morini Dart 350
1993 Ducati 750SS

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Re: 1965 G2CSR Clutch play

Postby ColourNcoat » Wed Nov 11, 2020 3:54 pm

clanger9 wrote:Good luck! :beer:

I wrote a guide on overhauling the Lightweight 'box - the bits on the output bearing & gear might be helpful:
https://www.ifixit.com/Guide/AJS-Matchl ... 77#s258666
https://www.ifixit.com/Guide/AJS-Matchl ... 77#s171888

That is great thanks. Just finished stripping and vapour blasted the engine and the main bearing bush needs changing but will change other roller bearing as Well.
Will have a read this evening about the gearbox and start stripping that tomorrow.
Also will order duplex this evening.
Thanks Clanger for all your advice :beer:

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