Just wondering . . . what's the difference between how cheap hookers and how expensive hookers jump around?
KLR engine temperatures will vary markedly in operation; less so with a Thermo-Bob installed. Some insist the "heat cycling" causes severe, drastic, and irreversible damage to unknown engine components, but . . . actual data on the premise remains elusive.
Same with, "thermal shock," the temperature difference within the cooling system network when the thermostat opens . . .
Regardless, as long as your temperature gauge needle stays out of the far red zone; fear not. Aside from the possible long-term calamities mentioned, your bike is operating within safe limits.