I didn't mean to suggest you should shut up! :) I appreciate you trying to help. But I am pretty confident the thermostat the S1 shop supplied isn't the issue. :)
BTW - I can now get the triangular thermostat housing top piece to tighten down on the thermostat housing assembly just using the 1 X 0.8mm gasket. I'd like to show Dave and Mick before I replace it on the engine.
Might not need any thicker gasket. Maybe you guys can take a gander at it on Sat or Sun arvo?

