I noticed with the GS21R noob engine, the temperature of the engine increases as the fuel is used up in the fuel tank.
At the current setting - it starts (after running 2 tanks already - so the engine is warmed up) at the low 190F when the tank is full then goes as high as 250F just as the tank is about to run out of fuel.
Anyone else notice this with their engines? Race engine or not.
I'd assume that the engine ran rich at FULL fuel level as the *head* of the fuel liquid gives the engine that certain pressure. As the fuel is used up, the pressure head drops - causing the engine to run leaner - thus in effect - raising the temperature of the engine.
NOTE: There is NO leak whatsoever on the fuel tubing (its new tubing) and all fuel inlet outlet from the tank to the engine and to the exhaust is snug.