The part is called the "Starter idler gear" according to the haynes manual, it sits between the starter motor and flywheel, tranfuring power from the starter
Ron Ayers don't do triumph parts so i couldn't look in there fiche which is my normal trick
If any one has eaither a Triumph motor they're stripping for bits, a friend doing the same or can get me really cheap Triumph parts (he got told over £100 for this small cog
Cheers
