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Well Don, Dan called me and explained how to modify the vernatherm to stop it from blowing off those white plastic thermostat housings and discussed your points.
But you brought up something totally different that now I will have to look for!
I updated this motor to relocate the overboard water indicator to the top of the exhaust manifold, using a big fuel hose to let the water flow out directly. It comes out like a fire hose! The cylinder head is original to the motor and utilizes the plastic housing thermostat that comes apart with the vernatherm.
When I ran the motor on the test prop in the river, I could not get it to rise above 90° at low RPM (<1500), and it would barely climb to 95-100° holding steady in above this, say 4000-5000.
I’m hoping the fix Dan explained will remedy this, as we all know it’s futile to calibrate these when they are cold. I’ll run it hard later this afternoon with a prop on the boat and see how it behaves across all RPM’s, temperature-wise.