Yes, i must be wrong because if you think of it my way, it is fairly impossible to get a carb working nicely anyway with all the hopping around it does.
Doing wheelies, climbing hills, jumping, cornering, (falling down) etc. It is a miracle that a carb works like it does. Nice piece of invention.
Dirt bike dave, i did not know about the chain saw. So it is operating without a "steady" fuel level?
To close things down, is a idle surge caused by too lean a mainjet, just a preignition because of too warm an engine? After a few minutes the idle surge will be gone, as the engine cools.