Sachs 50/MA ABE X - Which Spark Plug to use?

[mlbillow]

I just acquired a 1971 Arctic Cat Prowler with a Sachs 50 engine. It had an AC 45 spark plug in but not sure if that was the correct spark plug to use? Also, not sure what the gap should be or what the oil mixture should be. Anyone have info on the 1971 Arctic Cat Prowler?

 

[t555trailblazer]

 

[mlbillow]

View attachment 243062

This is great!!!! Thanks so much!

 

[Emac70]

Do either of you have an electrical diagram of this bike? I think the kill switch is bad