G2 CSR Gearbox

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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G2 CSR Gearbox

Postby Winkie » Sat Feb 16, 2008 8:39 pm

I had the equivalent AJS model 14CSR back in 1967 (it was a 1966 model) and it always leaked from the kickstart shaft, despite renewing the seal several times. A new seal may help a bit, but the high oil level needed in these boxes tends to make good sealing difficult. Mine also had a small amount of play in the lever - this was reduced when I changed the return spring - I remember that these were always a bit on the weak side, so I don't think you have too much to worry about. Just keep the oil level topped up and enjoy the bike.

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G2 CSR Gearbox

Postby ajscomboman » Sun Feb 17, 2008 11:16 am

Nigel

The oil level in these gearboxes is critical. With the gears being at the top of the box they require lubrication at all times. Oil leaks and the subsequent running dry is why the majority of these boxes failed in the past, especially in the hands of learner riders. The late Malcolm Saggers offered a machining facility that allowed the end cover to be fitted with lipped oil seals on both starter and gear change shafts. Most competent engineering companies will be able to offer this service but at a cost. I had Malcolm machine my cover and it's the best modification done on my Mod8, 10 yrs on still no leaks.

Whilst i think about it, i recall that way back there was an article written in the Jampot about fitting lipped seals. Maybe Jampot Editor Chris Read has something in his archives.


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G2 CSR Gearbox

Postby CR » Sun Feb 17, 2008 12:55 pm

quote:
Whilst i think about it, i recall that way back there was an article written in the Jampot about fitting lipped seals. Maybe Jampot Editor Chris Read has something in his archives.


You have almost as good a memory as I do! Article was published in Jampot issue 563 (june 1999) and was written by a Mr A.Trace from Plymouth.

I don't know if this one is in the archives? If not I'll have to scan it - but I need to finish the new Parts List first...

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G2 CSR Gearbox

Postby Eamonn » Sun Feb 17, 2008 2:24 pm

[url="http://www.ajs-matchless.com/article_read.asp?id=81"]Click here to view the article[/url]

Corners like a Lego man

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G2 CSR Gearbox

Postby basketcase » Sun Feb 17, 2008 7:20 pm

Thank you Eamonn,too bl**dy clever for my liking! I`m off work this week so it will have to wait until I can access the toolroom next week. Thanks everyone,

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G2 CSR Gearbox

Postby MikeM. » Sat Oct 25, 2008 8:09 pm

If the standard seal is the same size as used on the AMC ('58 onwards) gearbox then the one you want is available from AMC Classic Spares (advert in the Jampot). They cost 50p each, I have used one and so far seems to have cured the leak.

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G2 CSR Gearbox

Postby ajscomboman » Sat Oct 25, 2008 8:26 pm

Go into tech articles and click on gearbox it'll come up there. I've just tried and found it.

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G2 CSR Gearbox

Postby ajscomboman » Sat Oct 25, 2008 8:38 pm

Nigel meant say tech articles then click tech tips then gearbox.

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G2 CSR Gearbox

Postby basketcase » Sun Oct 26, 2008 4:45 pm

Thanks all, I`ve printed off a copy and pinned it to the wall behind my workbench. Let`s see me lose it now!!

Cheers,basketcase.

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G2 CSR Gearbox

Postby basketcase » Tue Mar 31, 2009 7:16 pm

I`ve recently renewed the seals,gaskets and kickstart return spring in the outer section of the gearbox. Upon re-assembly I found it impossible to find any gears. Eventually after about 30-40 tries I assembled it and `found` that I had gears. The only problem being now is that it jumps out of first gear upon acceleration.
Where have I gone wrong?
Pleadingly, basketcase.

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