Stephen,
Find a water hose or connection that is the highest on your engine and after ruining the engine enough to get the chill off it stop the engine and open the hose or connector and air will come out. Repeat this until only coolant burps out and you will find that the coolant stops blowing out the overflow.
As you are using a real engine the place I burp mine is the heater feed as seen in this photo. its to the left of the dizzy in front of the carby.
Also my engine runs at 80*C summer or winter.
Cheers,
Bryan
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COB-66 Young at heart old fart.
Don't drive faster than your guardian angel can fly.
If it doesn't matter what gear your in you have enough torque.
VK3KDN
