Carb Temp Jumping?

[dresoccer4]

I just noticed something odd, when performing the run-up, as I gently increase power, the carb temp first:

1) starts around 20c
2) increase throttle which slowly reduced temp to a stable -15c
3) increase throttle slightly more and the needle immediately jumps to +30c
4) slowly reduce throttle and needle drop back down to <-20c

is this normal behavior? (all with carb heat off, full rich)

 

Edited May 8, 2020 by dresoccer4

[tADEUS73]

Yeah, I was also mentioning it somewhere, the overall tendency of the rise and fall seems similar like in other pistons, but the jump is strange