Sprocket sizes

Information relating to the Matchless G2 or AJS Model 14 250cc Lightweight
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Bernie.Jones
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Joined: Sun Oct 28, 2018 8:58 am
Location: United Kingdom

Sprocket sizes

Post by Bernie.Jones »

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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Ozmadman
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Joined: Wed Dec 14, 2011 1:02 am
Location: ESSEX UK

Re: Sprocket sizes

Post by Ozmadman »

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
Bernie.Jones
Posts: 27
Joined: Sun Oct 28, 2018 8:58 am
Location: United Kingdom

Re: Sprocket sizes

Post by Bernie.Jones »

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 9:01 am, edited 1 time in total.
G15 Roy
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Re: Sprocket sizes

Post by G15 Roy »

Try Part number 041270 some stock shown.
Roy
Bernie.Jones
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Location: United Kingdom

Re: Sprocket sizes

Post by Bernie.Jones »

Thanks Roy - found them.

Regards,
Bernie
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Ozmadman
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Location: ESSEX UK

Re: Sprocket sizes

Post by Ozmadman »

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
Bernie.Jones
Posts: 27
Joined: Sun Oct 28, 2018 8:58 am
Location: United Kingdom

Re: Sprocket sizes

Post by Bernie.Jones »

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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