True, on a motorcycle where the plugs are changed a LOT sooner than those on some cars. There wouldn't be as much carbon build up on the plug threads.Good video, but not quite applicable for our bikes. I mean that part with loosing the spark plugs, then put back all together and starting the engine. I think that it is no need to doing that.
This may start something, not my intent, but from my own experience. Plugs in aluminum heads come out easier when the engine is hot. My feeling is when hot, the alloy expands more than the steel sparkplug so the hole get's ever so slightly larger thereby easing it's grip on the plug just a bit. Never stripped a plug hole in any alloy head using this hot method. Including anything from lawnmowers, to my original Norton, to a really overdo 5.3 liter Sierra V8.I can change plugs without all that effort. I've never had ANY trouble doing it. Just make sure to change plugs on a cold engine.