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Backfire is most often lean.... My ride'em lawnmower does it every time I shut down the throttle and ignition motor dies with last gasp backfire after it has stopped. You could make your screw driver stay on the needle valve by cutting a small piece of plastic tubing that has an opening to fit over the screw heard and attaching it to the end of the screw driver.

When there are two bearings in an assembly with a spacer in between them, the spacer will be tightly clamped between them. A spacer between the inner races keeps the bearings from moving or the inner race from being pushed out of the bearing when the nut mounting the assembly is tightened.. The spacer between the bearings makes them in effect one piece transferring the clamping power of the nut through the races to the shoulder they mount against.