Hi POI,
Did it still do the run when pumping the primer?
Is the poppet opening when you move the throttle lever up and down. It doesn't move that much but you should be able to see it open a couple of mm.
You said in your first post that if you take the float and needle out it runs at high revs. The fact that it runs like that amazes me but this proves the main jet is clear, the crank seals are fine and you have ignition. This only leaves the carby and I do get the odd carby body that gives me issues but I just move onto another body. The next step I will suggest is to do my carby mod to it and unless there is an issue with the carby body it will work. I will dig up the carby mod details once you get through the initial tests. The carby mod is designed to allow the motor to come back to an idle speed because these carbys were renowned for over revving or high revving. Of the several hundred of these I have done I have probably left 5 carbys unmodified apart from the viton tipped float needle which I fit everytime first thing before testing.
