First steps on a couple of things.
1) Fitting the electronics to drive the carburettor bowl heaters. The little thermostat needs an on-off switch, a fuse, and weather protection. This was a bit of an exercise in just buying an enclosure and trying it for fit, to both the bike and the components mounting on it or in it. It was only $3.50 out of Jaycar, it's not the end of the world if I have to go back for the next size up or down.
It'll go onto the bike. There's a place where it can be tucked out of view inside the side fairing, mounted on the instrument sub-frame side rail, but accessible to a gloved hand for switching on or off.
In this setup, I won't be able to see the relay indicator, the digital display, or access the setpoint buttons. That isn't really a problem though... I'll set operating temperature once, then never worry about it again. All I really need to know is how long to run the heaters before hitting the starter button.
2) fitting the heaters and temperature sensor to the carburettor bowls. Should be easy, could be easy, so far it's fighting me. I tried making a clamp-on metal block, but it's clunky at best and it won't transmit heat well without thermal adhesive or similar. I'll revert to sticking the heaters in the idle mix adjust screw holes, with provision for easy removal, and find a place to fit the sensor. Somehow.
3) thermal adhesive. This stuff might make life a bit easier: it's two-part epoxy, but with thermal conductivity like heatsink paste.
The stuff I've ordered is supported by its parent company with online datasheets, including good info like glass transition temperature, service temperature limits, and susceptibility to solvents like petrol. So far it checks out... here's the page:
https://www.atomadhesives.com/AA-SUP...Epoxy-Adhesive
I ordered a pack through Amazon. It's a pain having to wait, but I'd tried local supply (Jaycar) and all they had was thermal plaster. I don't think it'll survive. Vibration, heat, thermal expansion, and petrol don't make an easy environment for this stuff.
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