classic motorcycle forum
Motorcycle Discussions => British Bikes => Topic started by: Lincolnshire_Poacher on September 08, 2007, 02:02:02 AM
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As part of a restoration project my dad has bought recently, he has got here a 1930's Pride & Clark 100mph Speedo & drive, but we don't know what is used to drive the speedo drive (does that make sense?).
The drive unit we have has a Tufnel gear with hooked teeth, which appear to have been machined this way. Any suggestions ???
Phil
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Very early speedo drives were just a toothed wheel resembling a small sprocket attached to the wheel hub that drove the cable through a small gear wheel at the lower end of the cable that sat at roughly 90 degrees to the hub gear wheel?
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That was a thought of ours, but the teeth are a pecuiliar shape, not what i'd expect for driving off another gear, in a perpendicular or parallel orientation.
The shape of these would suggest that the (possible) mating gear teeth would have a buttress form (a sort of castlated shape), perhaps looking more like a ABS sensor ring off a modern car.
Plenty more conundorums to overcome yet with this project, for instance the Bowden Carb, which seems to be a clever blend of throttle body, & conventional Carburettor. I'll try and add some piccies in a few days of the speedo drive to see what people think.
Phil