Just remembered Boyd.
When I last saw the motor there was a lot of play/wiggle/wobble with the slow speed needle assembly.
I suggested to use BOTH of the packing washers out of your carb kit then.
Has this been done?
Absolute nil movement on this needle in packing is acceptable. It will stuff up the idle and other things if leaking air.
No wobble and firm in and out required.
That is why I wanted to use my carb.
Cheers
B