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Speedo for Falcon 81

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Speedo for Falcon 81

Post  john87 on Sat Jun 11, 2016 7:52 pm

Hi all, Anyone got a decent speedo for a Falcon 81?? Would they be the same as a tiger cub one?? Anyone tried one of the replica ones?? What they like, where did you get it, and what size??

john..

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speedos

Post  piston 197 on Sun Jun 12, 2016 6:07 am

It will depend if you are :-
a, trying to fill the hole in the headlight
or b, trying to get some form of accuracy ?
The speedos are designed to work with different ratio gearbox drives and wheel diameter.
The cub used variously 16,17,18,19 inch wheels on different models so even a cub uses different speedos
The Falcon 81 one is coded 80421/19/2 for the 1958 bike and on the new coding system SN3103/20 for the 59 bike, same speedo just 2 different code numbers from Smiths, either will do the job in conjunction with a 2 to 1 rear wheel speedo drive gearbox and should if working correctly be accurate, whereas any same sized speedo will fill the hole, but may not be accurate
JH
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My Speedo!

Post  john87 on Sun Jun 12, 2016 9:23 am

Ahh, I have been searching everywhere for an explanation of the serial numbers on the speedo, with no luck at all.. Mine is SN3103/20 so that bit is correct, at least i can be fairly sure it is the correct speedo with the correct mileage. Second part of the number is "1590" I assumed [maybe wrongly] that this was the "turns per mile" for the thing. [The important bit!]

My speedo has been sitting in a shed since 1982 at least, which would be ok, but there was no glass in it.. It was seized solid, but i have managed to clean up the internals to the point that it might actually work, but i think i might be better sending it to one of the specialists that recondition these things and at least have it properly repaired..

john..

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1590 coding

Post  piston 197 on Sun Jun 12, 2016 9:36 am

Yes 1590 revolutions of rear wheel per mile, based on wheel circumference when fitted with manufacturers recommended tyre size and with correct 2 to 1 smiths speedo drive.
JH
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