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I looked at the parts list, the C80 is Not a prime start even though some manuals say it is.
with no load the additional air can actually come from the ex ports to support a runaway.
thats why some modern engines and the old 2 cyl 35,33 and 40 big twins had a vacum switch to short a set of points if high intake vacum was present.
typically under a load as the throttle opens intake vacum drops close to 0"Hg or rises to atmospheric pressure.
with no load its possible to have 12-14"Hg in the intake and the RPM climbing.
thats why its not good to rev most 2 strokes on a flusher.
why it would not shut down with the key is odd.
could have been a very lean fuel mix that can act like a diesel and combust with compression.
usually the motor has to be almost at the point of overheat for that.
with no load the additional air can actually come from the ex ports to support a runaway.
thats why some modern engines and the old 2 cyl 35,33 and 40 big twins had a vacum switch to short a set of points if high intake vacum was present.
typically under a load as the throttle opens intake vacum drops close to 0"Hg or rises to atmospheric pressure.
with no load its possible to have 12-14"Hg in the intake and the RPM climbing.
thats why its not good to rev most 2 strokes on a flusher.
why it would not shut down with the key is odd.
could have been a very lean fuel mix that can act like a diesel and combust with compression.
usually the motor has to be almost at the point of overheat for that.
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