That issue is usually caused because the gap on the trough switch is too close. Open it up and you should be good.

Ball Kicker (left kickback) or Ball Return (out hole)? Assuming you mean Ball Return, that requires both the O/Ball Return relay to be active and the motor (switch 4C) to be turning. Are either of those happening? If not, could there be a short through the bottom arch or other metal bits under it?

/Mark

Hmm. The P relay should fire the O relay. And the O relay should always kick the Ball Return. I wonder if it isn't supposed to work that way even though the Ball Return kicks unnecessarily. I looked at Royal Flush and P doesn't fire O there.

On this game P doesn't start the Score Motor so maybe they just fired the O relay with P to get the Score Motor to turn. It's an extra kick but one less switch in the Score Motor circuit.

Is the switch in the outhole gapped adequately too? I could see where if it wasn't it might be closing briefly from the vibration when the trough switch fires everything off, and activate O again.

Yes, it looks like that's how it works. It's interesting looking at the design evolution of these circuits. This design remained unchanged until somewhere around the time of Far Out (late '74) when they added a P make/break to the ball return kicker path to filter that second pulse out. Then around Fast Draw (mid '75), P got its own motor and hold switches and became the circuit we all know and love.

Check the ball kicker for "mushrooming" and then take a file to it. When the kicker blade gets shroomed, it can catch the plastic switch arm and close the outhole switch as the kicker arm returns back to it's resting position. That of course re-energizes the O relay which will re-fire the kicker.