Wow, what an excellent effort to launch a serious discussion.
In response, all I can do is pick holes. However, I�ll certainly not claim that my choice of product is �the future�. In fact I doubt that description can apply to anything burning fossil fuels.
The holes I see are that, while you have covered the technical and rational considerations well, you have missed out two � more � crucial determinants: politics (& political power) as well as vested interest, with the two obviously going hand in hand, so to speak.
Is that not, for example, the primary factor that did in the manufacturers of 250cc 4-strokes engines? They were led up the garden path and then dropped when it was probably decided that this direction would not sufficiently serve the industry incumbents.
So instead said incumbents (there�s also an Italian name for this group that escapes me at present) devise a formula, calling it �KF�, that allows them to repackage and push a tired, old technology they�ve had on the shelf for ages.
Luckily for us buying public, BRP also chooses to operate in this market. And they are of course the only player with enough clout to face up to the above.
DavyBoy has repeatedly argued here that BRP Rotax should be recognised for its position in the market and adopted at the top championship level. That too is logical, but won't happen for the above reasons.
But the upshot of all this is that you�re probably right: 2-stroke is the short to medium term future.
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