Another good video Walt
I particularly liked the part where you discussed the bike cylinder. Since I have begun learning about porting theory as pertaining to saws, I have sure come to appreciate the complexity of my 250r cylinders. And you are right, wide power curve was their goal. My 250r cylinders have extra "boost" ports on the intake side, piston with a window on the intake side, reed valves and so on. I suspect that reed valves are necessary in bike mills due to porting layout. I'll bet your average bike cylinder has drastically different timing numbers that require reed valves to maintain case compression and prevent blowback through the carb. It's cool to begin understanding these things. I would also as that a wide power curve was not the only benefit of two-stroke porting tech before it came to an end. The power made per cc on a bike is amazing! Take the latest Honda CR125, they claimed over 35hp in stock configuration. That IS impressive! What's the HP per cc of displacement on any saw? Not anywhere near that. But it should be noted that with bikes, you have the ability to run tuned expansion chamber pipes, large carbs, reed valves, digital variable ignition, etc. All of those things along with that sophisticated porting layout equals a 125cc engine that makes over 35hp and spools to 10k rpm.. Hang on!
