Hi Wobs, I have an '01 Bonney, are these the ports next to the spark plugs? I think
that is a small diameter passage to the exhaust port for the air injection system.
Likely not enough room for an egt probe in there. I've done a little reading, seems
the probe should be centered in the exhaust stream, and mounted a certain distance
from the exhaust valve, according to what the probe manufacturer recommends.
Aircraft Spruce has a bunch listed under "Instruments". Good reference material there,
they show several of the clamp-on type. Drill a hole in the exhaust pipe, clamp on,
and you're done. Or the weld-on bung type, which you could remove and plug when
you convert over to street-bike mode.
Cheers, Dave