Author Topic: clocks for a scrambles tranny drive speedo?  (Read 1177 times)

Offline snowbeard

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clocks for a scrambles tranny drive speedo?
« on: 15.10. 2008 20:22 »
So I am beginning to think that having either a speedo or a tach would be nice.  I have the brass drive from the mag for the tach, but have taken it off since I have no dial or cable, why wear it out, eh?

so I realized that my speedo drive is off the bottom front of my tranny.  it's a '57 spitfire scrambler with the original SC. T2 transmission (at least the cover is stamped XX over STD which I am told is the designation)



can anyone tell me what drive ratio I need?  the bike is a rider, not a restoration by far, so I think I am alright with a repro just to have a readout before the lights start flashing!!

thanks
__________________
\'57 BSA A-10 Spitfire Scrambler
Spitfire Starting Video
\1960 Super Rocket (basket)
\1981 Suzi GS650
\1988 BMW K100LT in Lisbon!!

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Online bsa-bill

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Re: clocks for a scrambles tranny drive speedo?
« Reply #1 on: 15.10. 2008 22:08 »
Looks like you need to spend some cash on that kickstart pinion *whistle*

All the best - Bill
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline snowbeard

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Re: clocks for a scrambles tranny drive speedo?
« Reply #2 on: 16.10. 2008 01:07 »
oh thanks, Bill  *smil*  that was actually one of the very first things I fixed on this bike, flushed the tranny really really well, then replaced both the kickstart rachet and the return spring. 

but good eye  ;)
__________________
\'57 BSA A-10 Spitfire Scrambler
Spitfire Starting Video
\1960 Super Rocket (basket)
\1981 Suzi GS650
\1988 BMW K100LT in Lisbon!!

=

Offline dpaddock

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Re: clocks for a scrambles tranny drive speedo?
« Reply #3 on: 16.10. 2008 16:49 »
my '57 Spit has a Smiths SSM 5007/02A magnetic unit with a nominal calibration of 1600.
Actually, Mark Bohman dialed it in to suit my rear tire rolling radius, so it's pretty much spot on.
David
'57 Spitfire