Thanks GML for your input. Jono and Johno were unknown to me until you mentioned them. Currently they have 17.5hp motors for $550. Looking more and more likely to be an affordable solution should my motor have done its governor. Speaking of which, I thought I would include a link to the forum in which one contributor states that more than 15-20 degrees of governor shaft movement (after governor arm is removed) is indicative of failure, specifically related to 20hp Briggs and Stratton Intek motors. If true, it is a worthwhile diagnostic tool, I would have thought.
https://www.shopyourway.com/questions/1081458I have no idea as to the veracity of this statement, but intend to find out. Will report findings.