Thats pretty awesome to hear!
The engine only running on choke should just be tuning, though they did have some problems with the intake gaskets, particularly the top one.
For tuning the little one on the upper of the carb is your low speed, the one out the bottom on an angle is the high speed. 1.5 turns is the normal starting point.
I am keen to see what springs are on the drive as greenfield never used any to make the pedal go neutral. There should be 2 small springs internally in the drive but that is all. Usually what happens is people grease the drive shaft where the clutches slide, it gets gritty/sticky and won't neutralise.
