Want to start off by saying that this thing is a work of art for sure, not bashing on how it was built by any means. Just think for the money invested the power to weight ratio is just ok, rather than great. With that said remember that this sled in Russia, where it was shipped to is over 20k stock, so our methodology here by starting with a 13k dollar sled is already skewed.
So assuming that there is clearly no budget on this build, and that right now the weight to HP ratio completely full of fluids is .4294, just seems like since you already spent 45k we might as well max out the budget haha.
Those figures are based on 405 lb sled, 10 gallons of fuel at 6.073lb/gal and 200 HP. Jack does not claim HP on this motor so everybody just has a guess, most say 190-200 so we will use the high number.
(Stock 163 weighs in at 484.73 with approx 140 hp is .288)
With that said, I think you could save another 5-10 lbs just on using all Titanium Fasteners on the entire sled. You will save some weight believe it or not by switching to airframes over the billet boards from Polaris. You could remove the massive taillight and use an LED one. Titanium steering post, titanium front bumper etc. All little things yes but when talking about a 20lb difference for 30 grand, every ounce counts haha.
The real question that we would like to know is what does the carbon save for weight? Or all said and done does it? Also would like to know how much more the 900 motor weighs than the 800. If we knew those things we would really be able to break this build down etc. The only other lightweight sled we can compare to that we have seen numbers on a build would be Darcy's 397Lb. PRO Rmk.
Still an incredible build and truly a work of art, it is beautiful!