Found the lost one on the shelf complete with the Davis head ( the one from the UK not here yet) appears this one for a virgin engine has the best compression yet of any of my TT10s
put a few drops down the carb compression 1 1/2 turns out on the thumb screw about 10 or 12 quick flips and off it roared. I was about to start turning the compression screw in. no need and no kick back just went off martin