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Help me identify this part...1956 30 hp johnson...

cjbrill715

Regular Contributor
j30.jpg What is the unit on the cowl bracket that has a hose running to the intake manifold, and a single electrical wire running up to one of the points???...Rookie question, I know, But i'm restoring a 1956 Johnson 30 hp RD-18 that I found in a scrap yard....Also, is this part something that commonly wears out, or does it tend to survive??...If it commonly wears out, is it easy to find??
 
Vacuum cutout switch.------Designed to short out one set of points should a high vacuum develop.-----Designed to prevent a " runaway " high RPM condition.-----Very durable part and lots of used ones available cheap.
 
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