Thanks guys I will tune the engine to your instructions. We spent time this morning pulling the carb to bits again and this time washed it out with fuel, rather than just compressed air. Lot of small pieces of gunk came out, I expect pieces of grass and seeds (high summer here). The engine transitions OK now but does still hesitate a little, but does not stop. I am sure this hesitation will be eliminated following your tuning suggestions. I am also getting a carb filter to keep the little bits of gunk out. The engine just purrs when it running correctly.

Thanks for your help.

Cheers

David