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Speedo Drive #791773 12/01/19 6:12 pm
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Dave Martin Offline OP
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So ……. the speedo drive on my B44 has finally shuffled off this mortal coil and passed on to the great landfill in the sky (or at least it will when the garbage collection comes around). For various reasons, including smuggling and other nefarious acts (as Capt Jack Sparrow said "welcome to the Caribbean luv"), I can save a couple of $ and get a replacement that is listed as for an A65 / Norton Commando, these have a 3/4" hole yeah? mine should have an 11/16th which is smaller. Could the 3/4" hole ones fit?

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Re: Speedo Drive [Re: Dave Martin] #791778 12/01/19 6:44 pm
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kommando Online Content
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Check your Speedo looking at the small numbers at the bottom, most B44's have 1600 on them and need a 2:1 ratio gearbox, the A65 and Commando have 1000 and need a 1:1.25 or 15/12 gearbox..

Re: Speedo Drive [Re: Dave Martin] #791785 12/01/19 7:47 pm
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Dave Martin Offline OP
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Yeah, mine has the 1000 printed on it so the 15/12 is what I need. The issue is the hole in the drive, does the extra 1/16 cause a problem? (I cannot see how it would) or even is the A65 / Commando actually 11/16th not 3/4??
It truly is staggering how far a BSA owner will go to save $18!

Re: Speedo Drive [Re: Dave Martin] #791797 12/01/19 9:03 pm
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Ignoramus Offline
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it should be ok because it will still center on the felt washer/seal (marginal i recon) ........but more important i recon the amount of surface area for the axle and the inside spacers is marginal enough as it is. IE what the axle/spacers pinch/crush on.......remember its only alloy casting, which is not exactly known for its compression strength.

i would do one of 2 things

1 make (if you have access to a lathe) a small "shim" press fit into the ID of the housing and minimal clearance on the axle
OR
2 take all the internals out of the new drive and transfer them to the old one with the right size hole ( its a bit tricky but its doable )

of course there is always 3 get the right sized one

i have previously enlarged (bored out) the hole on a smaller one up to the size for the A65 but have never actually shimmed one down.

PS i cant say for certain , ive forgotten, what the size hole for the A65 is but 3/4" does sound right


"There's the way it ought to be and there's the way it is" (Sgt Barnes)

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