What bothers me is not that some people can't hear the difference. Ok, I'll accept the fact that some people need a tachometer to tune their 4-strokes.

What bothers me is when someone tells someone else who may be a little gun-shy about buying their first 4-stroke that they MUST buy a $30 piece of equipment to go with it or they won't be able to tune it - even though everyone I know does not need one.

Now you are the first one to say that we are not all alike, yet you jump on me when I tell these same people that they do NOT need to spend that extra money, nor do they need to learn a new technique to tune their engine. But you stick to your guns defending your position.

How about this:

Tune your 4-stroke the same way you would tune a 2-stroke. If you find you can't hear the difference in RPM (which some people can't) you may want to consider getting a tachometer to help you out.