Many thanks Deejay
I guess it helped that the powertorque is a relatively simple design that operates in a way, I as a nubee, could understand, even if it took maybe a week to "get it". Actually, I think it's an amazing design and its longevity is testament to that. However, I'm pretty sure you guys would have had my issue sorted within an hour if it was on your shop floor.
I also want to check later on the correct jet for this model. The local Stihl guy replaced the carb body maybe 18 months ago, I recall the original jet had some rings on it, the current one is plain, no rings.

Next up is my Rover XL Suzuki, but thats for another sub forum.

Cheers
Pat