This is an easy way to keep your small-mid size glow engine engine collection in top shape.
A wee bit of fuel drop in the carburetor, and flick. Don't use any electric starter, too much fuel drop will easily hydrolock your engine. I find that a good engine will start with hand flick. A few drop will last a couple of second of run. If you feel the engine is hot while in test, a quick WOT will shut the engine off.
In this video, i'm testing my ASP15A, OS40LA, vintage G-Mark 061, OS Max 25 FSR.
Safety first..! This method is only for experienced modellers, always wear gloves and always keep fire extinguisher close if you dealing with fuel.