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Thought I'd post some pics of my Smiths rev counter conversion. The gearbox came from Gaggs and the side casing was modified by Rimini, I also had to extend the brackets on the exhaust to clear the gearbox. I still need to route cable through crossmember and mount clock but it works a treat. I chose to keep the side casing finish original in keeping with the rest of the scooter and not have it polished or acid dipped.

Very nice

Superb!

Smart as fook m8

Excellent work

Nice looking job , I would check the angle drive as the one you have fitted is the plain bearing type which are the 4000 max rev ones , i only use the ball bearing type which are the 7000 rev drive,

tim_mason wrote:Nice looking job , I would check the angle drive as the one you have fitted is the plain bearing type which are the 4000 max rev ones , i only use the ball bearing type which are the 7000 rev drive,

Are the gearbox casings both the same size/shape?

yes

tim_mason wrote:yes

That's ok then, if there's an issue I'll send it back to Gaggs. How can you tell the difference, is it from the number on the end?

yes, I cannot quite see the full markings which indicate the ratio, just to check if that is correct as well ,

Some info that I found

RGB1507-1508 series

A range of gearboxes primarily for driving high reving engine, rev counters (tachometers) and designed to run at speeds of up to 7000PRM when fitted with ball race bearings, and up to 4000 RPM with self lubricating bronze bearings. Various ratios are available as well as reversing and non reversing.

RGB1507 (Ball Race) Maximum Input Revs 7000

RGB1507- 00 2:1 Ratio Non Reversing
RGB1507- 01 2:1 Ratio Non Reversing Long Spindle (.890”)
RGB1507- 02 2:1 Ratio Reversing
RGB1507- 03 4:1 Ratio Reversing
RGB1507- 04 2:1 Ratio Reversing (output .120” Internal Square)
RGB1507- 05 Not Allocated
RGB1507- 06 8:1 Ratio Reversing
RGB1507- 07 8:1 Ratio Non Reversing
RGB1507- 08 1:1 Ratio Reversing
RGB1507- 09 1:1 Ratio Non Reversing
RGB1507- 10 1:1 Ratio Non Reversing Long Spindle
RGB1507- 11 2:1 Ratio Reversing Long Spindle

RGB1508 Maximum Input Revs 4000

RGB1508- 00 1:1 Ratio Painted Black
RGB1508- 01 2:1 Ratio Reversing
RGB1508- 02 1:1 Ratio Reversing
RGB1508- 03 4:1 Ratio Reversing
RGB1508- 04 1:1 Ratio Reversing Painted Grey
RGB1508- 05 1:1 Ratio Reversing
RGB1508- 06 2:1 Ratio Reversing Painted Grey
RGB1508- 07 2:1 Ratio Non Reversing
RGB1508- 08 1.5:1 Ratio Reversing
RGB1508- 09 4:1 Ratio Non Reversing
RGB1508- 10 3:1 Ratio Non Reversing

Great, thx

tim_mason wrote:Nice looking job , I would check the angle drive as the one you have fitted is the plain bearing type which are the 4000 max rev ones , i only use the ball bearing type which are the 7000 rev drive,

I checked with Gaggs and they said they only sell the ball bearing type and to ignore the part number on it as some of the old boys in the workshop still use the old numbers, so all good