KDS20A/KD21 Pump
241912 was the complete motor & pump assembly for the KDS20A which used the KD21 series wash system. Any KD21 series pump or parts should work for you.
Pilot gas adjustment
Follow the 3/16" aluminum line to the pilot filter at the gas manifold pipe. There will be an adjustment screw for each of the pilots.
J500V Partio Cart
You are correct Pulltostart. These were introduced in June 1960. I have the service manual with schematic and wiring diagrams should anyone need a copy.