Applying thumbscrews to the exhaust in that video didn't result in much cooperation from the engine so I think I'll pass up the opportunity to drill a hole in my Gold Star's silencer.Maybe Magnetoman could put a thumbscrew in his tailpipe and go for a ride without the bunsen valve and see what the A/F sender has to say about that?
Returning to temperature, I suspect this is a non-issue for us since we only have one or two 500cc cylinders sending hot exhaust past the sensor, whereas car engines have six or eight cylinders providing that much more heat to dissipate. However, attached is the caution and work-around from my LM-1's manual.