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If it's 400# dry it's going to be a turd!!! I like the engine but they missed on the chassis. A poo 800 rmk is 406 dry.
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buy your 10 year old an 800 rmk then.
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I think the point trying to be made is that (at least) Polaris has found a way to make an 800 come in at 408 pounds and yet we continue to see beginner sleds offered that are much heavier. New ridders are usually young and do not have the upper body strength or body weight to counter act the weight of a heavy sled in the powder. I cringe when thinking of putting a new and or young rider on even a 120 hp 600. The lower power is good for a beginner so they do not get in over their head but the power to weight ratio also will affect a new riders ability to ride the sled in deep powder. Weight on a trail sled does not have as much of an effect although lighter is still better for new riders. All the MFG offer 4 wheelers in reduced scale sizes to fit all body sizes, age, and skill levels. I think it is reasonable to assume that the smallest model would not weigh more than a full size model, or to expect a smaller rider to be able control/ handle the extra weight when trying to learn. A Polaris 800 engine weighs around 100 pounds and this new 400 engine weighs around 50 lbs so it is not that big of a stretch to think a 360 pound powder sled is within reach with a single cylinder engine (at least in a Polaris chassis). I am a Polaris guy and I have spoke to anyone I can at that company over the last several years asking for a true beginner mountain sled built with existing parts in their inventory. They now have an EVO RMK and I understand they have most likely left out the light weight parts in an effort to hit the price point but still continue to ask why they do not offer snow check options to build one with the light weight parts. I take issue with the argument that these are super high cost parts when the R and D as well as the tooling costs have long been paid for by the volume already produced. I don't know Cat very well but it looks like they have included many premium parts including their new skid from their top of the line powder sled. I would be willing to guess the new Cat Blast M final weight can be calculated by deducting the weight difference of an 800 engine and the 400 engine from an 800M, a few pounds for the shorter track and a half gallon of coolant (around 55 pounds lighter than the 800) . I think their price point seems to reflect the cost of a new water cooled engine and most of the goodies from the full size sled. If my weight estimate is correct it would be hard to see how they could reduce the weight much more if the new sled is built from a full size sled platform that is already heavier than the competition. I do agree power to weight is very important in a powder sled.