Hello Simon,
A little while ago I had problems with mine not working because a spacer drive washer was missing. Fortunately for me another member kindly did some research and found a KTM washer which fixed my problem.
Attachment:
Speedo drive washer.jpg [ 586.36 KiB | Viewed 5628 times ]
Take a look at;
http://www.ams4ktm.co.uk/ktm-parts-find ... 146_730383The image of the speedometer drive looks very similar to our original unit.
Whilst investigating I did not come across a single replacement CEV drive that was exactly the same but it might just be that the KTM version of speedo gearbox could fit or be modified to fit your bike
Perhaps if you could measure your drive unit and/or take it to a KTM dealer they might have a suitable replacement. I received very good service from AMS Motorcycles.
I will try to look out for a 'genuine' drive but let me know how you get on and if possible I will try to help from this side of the channel.
TTFN
Hugh.