Hi Grumpy, no doubt i have confused everyone involved, this is how i feel everyday ( sorry readers ). Let me start again.

Photo 1 all attachments on carby: runs but revs high then low etc. [Linked Image]

Photo 2 elbow and gasket/insulator attached, no hose or airfilter, runs as above.
[Linked Image]

Photo 3 elbow only, no gasket/insulator, runs as above. [Linked Image]

Photo 4 gasket/insulator only, runs as above. [Linked Image]

And with nothing on the carby it will run the same as above.. I think i have forgotten to mention that if i pull the choke approx half way closed while running the motor it will smooth out and run properly, or as i just found out blocking the idle air bleed. Sorry Grumpy, hope this get us up to speed.