In tracking your temps, try to standardize the position that you take the temperature from because when the engine is running, they vary considerably. Take your temperatures with the engine running. Heat soaking will distort the readings on a stopped engine.

On the two stroke, measure right beside the glow plug on the exhaust side of the cylinder head.

On the four stroke, measure just above or behind the exhaust pipe.

Getting to 300 F is getting too hot.

Establish base lines on all your engines so you have a comparable later on.