Testing Cut-out Switch

[frankr]

No reason why not, that I know of. Sez it has a range of up to 30" mercury which is pretty darn good. But maybe that is speaking of the gauge??

[outbdnut2]

I’ve got several RDs and the way I make sure the vacuum cutout is working is to get it running in neutral and momentarily advance the carb throttle linkage so it momentarily revs up big – you will hear it go "Chunk-Chunk-chunk" as it cuts one cylinder in and out to keep the revs down. I have never found a bad vacuum cutout switch.
Dave

[Buccaneer]

I’ve only had two or three bigger motors in my life, and never
experience the pleasure or displeasure of seeing one "run away"
So what’s the theory exactly on how it happens, and can it
happen when revved up in gear in the water?
From what little I’ve gleaned from this site, I gather the sudden
increase in vacuum (from when the motor is revved up, then
throttle shut) allows too much fuel to be sucked into the crankcase,
even with the throttle shut.
Is this kind of it?

Prepare to be boarded!

[Author]

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