when people talk hp to weight ratio they fail to count the heaviest part of the sled. the person driving it
example a 100 hp sled weighs 500 lbs, a 600 lbs sled would need 120 hp for the same ratio.
through on a 200 lbs of rider and gear, and 100 lbs of fluids (easy to do)
the 600 lb sled only needs to make 112.5 hp to have the same power to weight ratio.
for a real fatass like me, the only time the weight of the sled matters at all is when it gets stuck
another point
what really matters is how much power gets to the ground thoughout a pass, not just what the hp peak on the dyno says, and the broader powerband of the 4 strokes whittles away the difference even more.
kind of like comparing a 300 hp deisel to a 300 hp gas engine. the deisel will leave the gasser eathing soot filled smoke