jerky overrun

[knackeredMk1]

The revs hanging is often associated with lean running but it can also be the throttle cable being kinked or not running smoothly. So if the cable is looking a bit sad they are not expensive and probably worth buying just for the improvement in feel and could be the answer to that part of your problems.

[prime]

If its running a bit lean low down would the mixture screw or needle position have much affect on this?

[knackeredMk1]

Both would have a small effect on early throttle settings. Only the mixture screw would effect when the throttle is on its stop. There is information on the forum about setting the mixture screw.

[prime]

Cheers I will have a good look

[fallenmikethebike]

Probably an air leak then. Check the plug for colour. Spray some WD type oil around the rubber intake manifold, see if that gives a temporary fix, if so the rubber needs replacing.
Mike

[prime]

Thanks mike I will have a check again for air leaks over the weekend