G'day Norm,
It's just a standard centrifugal mechanical governor, with the governor gear/bobweights mounted on a vertical shaft in the sump. Looks like the governor gear is probably driven by the camshaft driven gear.

Same principle as for this Briggs description:
[Linked Image]


Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."