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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
speedo gearbox
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<blockquote data-quote="vapide" data-source="post: 2808" data-attributes="member: 181"><p>There seem to be at least three gearboxes one may encounter on 5" Shadow clocks. As I understand it, the original ones had non-threaded inputs, so they could only be used with the original gearbox which clamped over the input stub. Repros usually had a standard movement with a threaded stub so a cable could be attached directly, but were supplied with a Smiths BG2410/00 gearbox which has a captured knurled screw which screws down over the threaded input stub. Later repros seem to use Landrover gearboxes. I think the Smiths is a little smaller but can't swear to it. Just to make it more complicated, there was a modification available in the old days to eliminate the troublesome gearbox by putting a threaded input on the original speedos so the cable could be run straight out of the back, and its possible an original speedo so modified could have been fitted later with the BG or Rover box. Doug Wood apparently has a source of the original style boxes which he uses in his repros. The Smiths BG is no longer made but NOS ones turn up fairly regularly (I bought a couple recently for $50 each), and the Rover one seems to be readily available.</p></blockquote><p></p>
[QUOTE="vapide, post: 2808, member: 181"] There seem to be at least three gearboxes one may encounter on 5" Shadow clocks. As I understand it, the original ones had non-threaded inputs, so they could only be used with the original gearbox which clamped over the input stub. Repros usually had a standard movement with a threaded stub so a cable could be attached directly, but were supplied with a Smiths BG2410/00 gearbox which has a captured knurled screw which screws down over the threaded input stub. Later repros seem to use Landrover gearboxes. I think the Smiths is a little smaller but can't swear to it. Just to make it more complicated, there was a modification available in the old days to eliminate the troublesome gearbox by putting a threaded input on the original speedos so the cable could be run straight out of the back, and its possible an original speedo so modified could have been fitted later with the BG or Rover box. Doug Wood apparently has a source of the original style boxes which he uses in his repros. The Smiths BG is no longer made but NOS ones turn up fairly regularly (I bought a couple recently for $50 each), and the Rover one seems to be readily available. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
speedo gearbox
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