Very interesting engine. A bit of history for Jensen lovers.
Sounds like a project for a very thorough restorer.
One question. Did you check for continuity? I have a model #25
and it measured no continuity when I touched the meter probes
against the terminals of the heater (Very dirty w/corrosion).
Please note this was done while the heater was in its location.
I cleaned up enough to get good clean contact and not only was
the circuit complete it measured the correct resistance. Once
back together it heated and ran like a champ.
A 1953 model 10 sold recently at another auction for $125 + fee
and I was hi-bidder. It runs reasonably well but has a crack in
the wall of the cylinder (not a surprise) that cuts down on the
power and will not drive the generator fast enough. I'll fix that
soon enough, along with refurbishing the sightglass. Thankfully,
the generator works well and I think the light bulb may be original.
Go Jensen!
Wayne