Couldn't find your FB page 3:16?? I'm sure you have some good info.
OP, I see you posted the question on the vmax site, too. No doubt you have read the interview there under the "Article Index" about the '82 SRX with the Asst. Prod. Mgr-Snowmobile Tom Berkley.
In discussing the '81 SRX, he answered:
"Machines like the SRX, with radical porting and carbs to match, have a tendency to be very sensitive to carburetion. They require frequent adj. to suit the temp and altitude.
"The SRX has a rather narrow tolerance for fuel mixture".
"It was an intolerant engine".
If there was ever a factory engine, IMHO, that deserves an excellent, quick responding EGT probe and gauge set up, this one would qualify.
Most engines I wouldn't worry....but this may be the exception.
The expense to install these might save a lot of grief in the future.