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Front wheel speedo drive unit

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Oddjob:
So why the different part numbers Bry?

exvalvesetdabbler:
Most honda and Yamaha used the same internal gearing in the Speedos so it would make sense that the gear in the drive accounts for wheel circumference.

2240 rpm on the cable for 60mph

Full list here
https://web.archive.org/web/20250324054306/https://mostynindustries.com.au/speedo-tacho-ratios

Regards
Dave

Bryanj:
Not sure Ken, there used to be a supercision list and i suspect its on there

honda-san:
Yes, 500 and 750 both have the same 19" front wheel and drive plate, so hard to imagine why their drive gearboxes have different part numbers. Having checked via both Fowlers and DSS web site, none of the part numbers supersede to any of the others - suggesting there must be a difference.

I too had pondered setting a wheel up, and attaching a degree disc to the square cable tang and making measurements. Just wondered if I had missed something obvious that would enable easy visual identification. 

Oddjob:
Maybe a vernier gauge would show any difference in the size of the housing. Maybe so slight but it’s difficult to see by the naked eye

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