I'll ask next time I'm in.

You guys make me laugh. How many of us love 4-strokes because they don't make the same sounds that two-strokes do? Quite a few of us, I'd imagine. Part of that is that the pitch changes aren't nearly as perceptible. Again, if you say you can hear the difference, that's really great for you. I'm proud of you. You deserve a gold star. Most of us, however, can't do that. For whatever reason you have difficulty accepting that. I'm not sure why.

If you can pick out exactly when a 4-stroke is peaked, that's great. If your ears will tell you when it's richened 300-500rpm, that's great, too. My ears don't work that way, so I use a simple, inexpensive tool.