One huge advantage to the porting if done the way I will describe is much better cooling which there seems to be a lot of complaining about.
How do I know this, from partly self inflicted cooling issues,. In order to build a 360 lb mtn sled with just the little 600 carb engine I took anything that might be excess weight off including the front heat exchanger for about 4 or 5 lbs weight loss counting the coolant in it. (My thinking was on a good day going down a mountain it might have 120 HP and stock exchangers were the same as 160 HP 800's)
I have run ported, unported and now ported again. The last configuration with a ported down the center (small rectangular hole and two wheel axle) and a snow flap I made goes to within a couple inches of the snow got my temps down into low 120's finally with good snow. Before was 140 to 150's.
Why the ported works better for cooling, snow gets in the skid, as the track rolls over the rear axle the snow in there is carried up and thrown up at the heat exchanger via the holes.
It does hurt my flotation a little.
- SummitRider11 likes this