Gear ratios

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Pharisee
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Gear ratios

Post by Pharisee »

Rightly, or wrongly, I fitted an AMC gearbox from a 1960 AJS M18 behind my (nominally) 1954 Matchless G3 engine. It works fine but the gear ratios aren't ideally suited to that engine. First and second are quite close together, as are third and top but there is a big jump from second to third which necessitates reeving the engine harder than I would like in second before making the change to third.

Were all the AMC gearboxes fitted with the same internal ratios or were they changed to suit whichever make/model of bike they were fitted to? Ideally, I would like to either raise the second gear ratio a little or lower the third gear ratio a bit.
Are/were different internal gears available that might allow me to do this?
I'm from the Fens.... Gimme six.
Mick D
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Joined: Mon Mar 24, 2014 5:44 pm
Location: Aberdeenshire

Re: Gear ratios

Post by Mick D »

Hi

There are some different configurations - check out the data on pg 7 of the 57 - 64 Workshop Manual.

Regards Mick
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