EFE Clocks

[OzyChris]

Hey all, long time no post. 

I seem to remember back in the depths of time someone used to refurbish EFE Clocks, but I can remember who!

Search did find anything. Any ideas?

[RobNukem]

Hi,

I don’t have the information you want but I’ve had mine apart and bought some spares and got them working, Can I ask what the problem is or is it just for a refurb?

[fab]

On 11/1/2025 at 7:28 PM, OzyChris said:

Hey all, long time no post. 

I seem to remember back in the depths of time someone used to refurbish EFE Clocks, but I can remember who!

Search did find anything. Any ideas?

if you're in Australia manly instruments does great work.

[RobNukem]

Sorry, UK, I couldn’t be much further away

 

[OzyChris]

Nope although im from WA, i live in Guernsey, just off the french coast. They are tatty and the tacho doesn’t work, but I now th in no that may be because it’s got a dyna s ignition unit. 

[Duckndive]

20 minutes ago, OzyChris said:

Nope although im from WA, i live in Guernsey, just off the french coast. They are tatty and the tacho doesn’t work, but I now th in no that may be because it’s got a dyna s ignition unit. 

Sometimes need to add a resistor in a patch lead "an adult will explain" 

Dyna used to supply the patch lead with Dyna S but don't anymore 

[DH115]

Has anyone ever converted the stock EFE clocks to work using a koso speed sensor. The previous owner of mine fitted a TL1000R front end which has no speedo drive and he fitted a Koso stand alone speedo with wheel speed sensor. Is there anything on the market that takes the speed sensor signal and  screws into the stock EFE speedo and allows it to work . Want to keep the stock clocks and lose the Koso stand alone one 

[inazumarob]

Look at a company called Digital Speedos, I think they do the adaptor you need.

[DH115]

Thank you will look them up

[arnout]

I moved the speedo cable to the front sprocket on my EFE as I'm planning to swap the front end for one that has no space for a speedo drive.
 

 

[Katana]

On 11/22/2025 at 8:57 PM, arnout said:

I moved the speedo cable to the front sprocket on my EFE as I'm planning to swap the front end for one that has no space for a speedo drive.
 

 

How did you do that?

[Blubber]

40 minutes ago, Katana said:

How did you do that?

The H0nda CBR400RR from 1990 till 1994 has a front sprocket driven speedo Pictures maybe even more models. 

@arnout adapted that to fit his sprocket cover. 

Edited December 2 by Blubber

[arnout]

14 hours ago, Blubber said:

The H0nda CBR400RR from 1990 till 1994 has a front sprocket driven speedo Pictures maybe even more models. 

@arnout adapted that to fit his sprocket cover. 

Yup 

The H*cough*nda speedo drive isn't CBR400RR specific btw, and the same part is used on the NC30 (VFR400), RC30 and various other VFR750 versions.

I first looked into the RC30 setup originally because of its 18" rear wheel, as it's the same diameter I use on my EFE. And so reckoned the ratio might be somewhere near. Further calculations showed that the ratio of the final transmission of my EFE was similar to that of the RC30 as well, and in actual live tests the speedo accuracy hadn't become worse than is was before with the GSX-R front wheel speedo drive. So that worked out well.

Main downside of this setup is however that you're locked to a certain final sprocket combination for the speedo to indicate somewhere correctly.

To fit the speedo drive onto the front sprocket ready made mounting kits are available from well know places on the internet. But because I think these are ugly and won't allow to keep the original sprocket cover, I decided for a different -less conspicuous- solution. It took quite a bit of tinkering to make it all fit inside the modified stock cover though. (I can post or link to some photos if anyone is interested). 

[Katana]

I’m interested. I have a GSXR motor in mine with a aftermarket sprocket cover so should be able to adapt somthing

tbanks

[arnout]

14 hours ago, Katana said:

I’m interested. I have a GSXR motor in mine with a aftermarket sprocket cover so should be able to adapt somthing

tbanks

OK. Posted some photos below of my efforts, which might give you some ideas for doing something similar with a GSX-R engine.
But keep in mind that the ratio of the final transmission required to make the H*nda speedo drive work correctly with the speedometer, might not be (close to) the ratio of the sprocket combo that you want to use on your bike. 

Oh.. Lining up the shaft of the speedo drive with the output shaft of the engine is a bit fiddly. I used slightly oversize holes in de mounting plate to allow for small adjustments. Also the lateral spacing takes quite a bit of measuring and test fitting to avoid any clamping pressure on the speedo drive and the plastic (PA) adapter, but still keep a snug fit.
I used a dremel as a router to machine the 3 (glued in place) mounting points and various surfaces level and parallel to mounting face of the sprocket cover.

[Katana]

Thanks will look into it