Electrex. This is the one for my 1vj.
https://www.electrexworld.co.uk/acatalo ... XT600.html
They do the correct ignition coil, and good regulators too.
Highly likely the same one, but I’d double check with the other 34l/55w guys first
Actually it’s different by he looks of it.
https://www.cmsnl.com/yamaha-xt600-dual ... 4l8141051/
This is on cmsnl. For a US xt600. Kick only

Thanks everyone for your answers, I drove the bike a few times more and figured it out. All it needed was a tiny tiny bit of gas when really hot and it starts right away.

Cheap solution is always best , glad youre sorted

I find with carbs on bikes and old wagons, that once you’ve changed anything, the starting process always changes slightly too. Always a learning curve.