Wendelspanswick
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Do you have a timing gun? I've used one in the past to check the HT output on a mower that refused to idle, clip the sensor on the HT lead and connect the timing gun to a 12v battery. Every time the plug sparks the gun will flash, if the flash is irratic at idle it points to an ignition problem.Starting to get frustrated with this thing now - just had the carb off again (umpteenth time) - ran a bit of wire through the passage for the air screw and that seems clear. It runs reasonably under load but tends to spit and die when the throttle is released. On tick-over it tends to run fast and strong for a few seconds and then slows down and runs lumpy. Usually after a while of running lumpy it spits and dies. I have just been trying it with the new plug from my brushcutter so it's not the plug.
Help please someone - or this thing might well be headed for the tip!
Another area to look at is the valves, you could have a valve not seating properly so on idle its low on compression, especially if it's been sat awhile.