Can a Smiths speedo drive be driven backwards?

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o0norton0o said:
So,.. after some long periods of thought (which makes my brain hurt) I've come up with a postulate of sorts...

There are 3 variables:
-which side of the bike the gearbox is mounted on determins the spin direction relative to the gearbox
- which direction on the output shaft is used to exit in the direction of the gauge (being mounted with the output cable above or below the axle)
- which way the gears are cut to spin the cable pinion and cable

Unfortunately, if you chose any 2 variables that automatically dictates the third one in order to get the cable to spin in the proper direction for the gauge to work.

IN the case of chosing the timing side mount with the output cable exiting above the axl, the norton speedo-gearbox gears are cut the wrong way to spin the cable properly for the guage. This means you have to change a different variable to change the spin direction of the output cable OR change the angles to their mirror opposite directions on the drive gears.

The modified Norton gearbox has different mirror image gears in it that allows it to be used. Someone or the PO did a hellof a job on it. I reinstalled it until I can find a replacement. heres a photo for comparison, you just barely see the worms
 

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jimbo said:
I have been in contact with them all week :?

Do you mean they couldn't help, or haven't replied to emails/calls?
 
L.A.B. said:
jimbo said:
I have been in contact with them all week :?

Do you mean they couldn't help, or haven't replied to emails/calls?


Hitchcocks don't have the gearbox I need. BG5331/107

Burtons said they had the correct one , then they sent info on the one they had and it was wrong. And I have been getting my email bounced by their stupid spambot, causing a real problem with communication
 
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