That has been beaten to death first with cat and 2nd with Yammy....pol has addressed it to some extent with coatings on the higher models, and maybe we'll see cooling system changes on the next model. Pol seems relatively open to buyer suggestions these days, so I wouldn't doubt they pay attention to such discussions. there was a thread in the pro section about what pol could better for the next rendition.... it was well received and well participated in and covered many topics. Like Icr said...the forums seems to have some weight to manufactures decisions these days.
This seems like Yammy owners are mostly unwilling to have a similar discussion....so I guess everyone thinks this is as good as it's ever gonna get.....?
Or Yammie owners don't want to have a discussion because they don't think it's as big an issue as some think - maybe that's why it isn't that important....
From a marketing perspective they just made a huge move with the Cat chassis. In the next couple of years they can easily increase power and reduce weight.
They don't need a new motor because this one can be easily tuned and more than meets emissions.
And they can't beat two strokes at the weight and boondocking game so why try.
And as for efficiency the track is by far the most inefficient piece of the drive train so putting belt drive on is a drop in the bucket. An existing clutch system turning lower revs would do more for efficiency.....