been out on the bike today and its pinking,sy250 two stroke,running it on castrol tts,80mls to 5 lts fuel,standard jets ,would running it on super unleaded cure it?

normaly pinking is due to low grade fuel. ign timming to far advanced but you can not change that on modern bikes.air leak at manifold or carb running weak poss air filter not on properly.so first thing check bike,then use proboost stuff in fuel.

check the fan water level thermostat

with the hot weather it may be overheating which will cause it to pink