Sprocket sizes

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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Sprocket sizes

Postby Bernie.Jones » Wed May 01, 2019 6:55 pm

Have just completed the first run on my rebuilt G2 and it seems to be revving rather high in all gears.
Not clutch slip so I'm wondering what the standard sprocket sizes are and whether I'm under-geared for some reason.

Thanks,
Bernie

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Re: Sprocket sizes

Postby Ozmadman » Wed May 01, 2019 8:45 pm

Bernie.Jones wrote:Have just completed the first run on my rebuilt G2 and it seems to be revving rather high in all gears.
Not clutch slip so I'm wondering what the standard sprocket sizes are and whether I'm under-geared for some reason.

Thanks,
Bernie

Most lightweight owners say the same thing, yours may be a 17 tooth but my 350 had a standard 18 tooth and I have fitted a 20 tooth and first gear is actually useful now and it is a lot happier around 60 mph now too.
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

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Re: Sprocket sizes

Postby Bernie.Jones » Thu May 02, 2019 6:57 am

Thanks Paul - do you know of a supplier for a 20 tooth? The club, and other sites I've searched, only seem to have the 19s ?

(Answered - Andrew Engineering! )

Cheers,
Bernie
Last edited by Bernie.Jones on Thu May 02, 2019 8:01 am, edited 1 time in total.

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Re: Sprocket sizes

Postby G15 Roy » Thu May 02, 2019 8:00 am

Try Part number 041270 some stock shown.
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Re: Sprocket sizes

Postby Bernie.Jones » Thu May 02, 2019 8:35 am

Thanks Roy - found them.

Regards,
Bernie

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Re: Sprocket sizes

Postby Ozmadman » Thu May 02, 2019 10:12 am

You might also need a longer )or lengthen your) chain, cant remember what I did (think I just replaced the chain) as it was a few years back now
Paul
1960 Model 8
1974 Yamaha RD250B US Model 6 speed

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Joined: Sun Oct 28, 2018 8:58 am
Location: United Kingdom

Re: Sprocket sizes

Postby Bernie.Jones » Thu May 02, 2019 3:12 pm

Thanks again. Could someone please remind me of the chain size? I measure it as 5/8" wide and 1/2" pitch (between pin centres) but most sites I look at seem to suggest it's 1/4" pitch so a bit confused.

Also, any suggestions as to where I might get extension links please? I assume that these need to be hand riveted on?

Many thanks,
Bernie

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