Sounds very amateurish to me. I'd either use the method detailed in the manual or [link=http://rbmods.net/enginetempering.php]this[/link]
ORIGINAL: rc10gt2guy7
Continue running the first tank of fuel, repeatedly giving it one-quarter throttle then braking until it is almost empty. Do not run the tank dry because this will result in a burned out glow plug from the fuel mixture being too lean and can also lead to damage from high engine temperatures.
Shut off the engine by pinching the fuel line to the carburetor and let it cool down for about 10-15 minutes before you start on your next tank of fuel.
This is also a load of nonsense. First it states that running the tank dry will starve the engine and damage it, then it advises doing exactly the same thing (starving the engine of fue) by pinching the fuel line.