I'm aware of the changes, Mike, but the motor is still ported toward the top end of the RPM power curve. I've seen several run, and they always had that little bit of "burble" in the mid-range, even though the carb idle mixure was extremely leaned out. It's all a compromise with these engines, and the porting in the cylinders, and over-sized reed assembly are the last barriers to a smooth mid-range. Since the DA100 uses the same reed, and runs a LOT better in the midrange area (IMHO . .but I'm pretty anal about this) it all falls on the ports .. and the 3W is ported with longer duration and higher mixture flow as the primary consideration. Just look at the ports on each engine, the difference is blatantly evident.

This is why BME has gone to shorter duration porting (than either DA OR 3W) in the new Xtreme cylinders, though BME uses a high-flow, short duration design of the ports to promote the best possible mid-range and smoothness of operation, while still allowing great top-end power. Add in that the enigne is designed to make great gains with tuned exhaust (pointing to the more conservative porting that helps prevent pulse reversion and promote flow) and the design qualifications are plainly evident.

3W has their focus, DA has theirs, and BME has theirs. Pull back the port timing on a 3W by about 10-15 degrees and see the power drop, but the mid-range will become a lot better. One other consideration. . DA has cylinders the "old way", yet runs melted-butter smooth. that thing from 3W about "reversing" the cylinders for more smoothness is pretty much another marketing claim. They did it, but the flow differences between rear-induction and bottom induction motors are so pronounced there is NO credence that 3W did it because the rear-induction motors were smoother. This is yet another bogus 3W claim. When it comes to smoothness of operation, internal crankcase shape, not front-rear location of the cylinders, is a much bigger consideration. The newer crankcase designs, rather than cylinder location, are what has balanced the flow.

Imagine THIS. . they MIGHT have changed the location of the cylinders to provide more room on the right side for engine thrust angle???? And if this "theory" about which cylinder should be farther forward was true, my old style TOC140 and DA150 (both with the cylinders in the WRONG places)would not both be smoother than my New Generation TOC150.

It's the porting, Mike, nothing more.