He is talking about listening for the engine rpm change as you remove the plug one at a time. It was an old trick to find out which was the bad cylinder without equipment. Some engines you will hear it better than others, some guys rely on the tach for the detection, the one that is not firing will have no effect on the sound or rpm.
Least that is what I believe he is talking about
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Willy
1986 V20 Old School
1992 V20 1992 150 Yamaha
1997 HydraSport 2250 Vector
2009 17' G3 Outfitter "G Spot"
http://www.youtube.com/watch?v=TDebw...eature=related
"I won't be wronged, I won't be insulted and I won't be laid on a hand on. I don't do these things to others and I require the same from them" JW
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