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I am thinking of replacing my Waxstat's and using this kit below:

https://www.ebay.co.uk/itm/TRIUMPH-TR6-TR7-SPRINT-2-5-HS6-SU-TWIN-CARB-REBUILD-KIT-WAXSTAT-CONVERSION/233497090657?_trkparms=aid%3D1110001%26algo%3DSPLICE.SIM%26ao%3D1%26asc%3D20160323102634%26meid%3D6799e6cf0b1f4f30aa3e9bd0cff254c8%26pid%3D100623%26rk%3D1%26rkt%3D5%26sd%3D233399792153%26itm%3D233497090657%26pmt%3D0%26noa%3D1%26pg%3D2047675&_trksid=p2047675.c100623.m-1

I have to replace the butterfly bush too on the carb near the bulkhead, so thinking I may as well do the whole job in one go.

Has anyone done this conversion or any words of advice?

Some reading in my blog, label SU from july 2017 onwards: https://tr7beans.blogspot.com/search/label/SU
Most important thing to bear in mind is that when you need to fit (new) bushes for the throttle spindels, you need a milling machine.

Need a milling machine?

Or some way of accurately machining the bush holes the right size,depth and exactly in line.His is possibly not a job for a hand drill.Steve..

OK so if I am getting this right, if I replace the Waxstat jets to the pre 76 non thermostatic jets, I will need to machine the needle to make it fit? I will not be able to buy the uprated ones that are currently available?

No, you need a milling machine when you have to fit throttle spindle bushes.
Maybe some reading is in order before you start with this job

Hi Phil,
Are you back home?

The conversion to non wax-stats is a straight forward bolt in job...a bit finnicky, but no machining required.

The carbies tend to wear where the brass shafts that carry the butterfly valves pass through the
alloy body. This is equivalent to an air leak and causes idling problems.
If it is bad enough, you have to have bushes fitted, although it's probably easier to throw it away
and find one that hasn't worn.

The other option is to have a groove machined in the shaft and fit an "O" ring to seal it.

Another problem with worn spindles is that the throttle disc won't seat properly.
As a result idle speed can become quite random.
Though an extra seal certainly won't harm

Hi Stag76, yes I am back home now (back in the UK) and my girl is back with me after her long holiday in Australia

I think that is my problem, that I need to replace the bushes on the carb near to the bulk head. When I tried to tune them, I could get the carb by the rad down to a low number, but the carb by the bulk head would now go below 5 on the carb tuner.

When I was there, I was thinking it may be worth changing the jets too and getting the whole system. Currently, my idle runs at 850 - 900 when warmed up, but after the electric fan has been the idle runs at 900 - 950.