Oil isn't even at it's correct working temperature until it's at 100C.
Those temps on an air cooled engine wouldn't worry me.
Your viscosity rating 40/50 etc is actually measured at 100c
As for those temp gauges. They may not be totally accurate but what they do show is variations. If you're usually running a certain temperature and it suddenly drastically changes, then it's a great warning that something is going wrong. Especially when your oil is low because it WON'T register a temperature you're used to.
You should test your temp gauge in boiling water too. See how far out it is.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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