Shattered I tell you what it gets very cold and I appriciat the input a lot. Yeah do you still own your rx 1? yeah I was a skidoo guy and still am but im getting hooked on 4 strokes for how many miles they last and the new xtx comes with a backcountry track so that will be nice thanks so much any more would be great. I look into that timber sled suspention but they run pretty high so Ill have to think about that one prolly getting a barker exhaust haven't got the sled yet will soon though excited
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I still have my RX1 and still love it. I have about 6000 miles on it and the only thing I've had to do to the motor is put engine oil in it after I roll it over. I've done some mods (mostly ergonomic) , but nothing too extensive and again, haven't had to touch the engine and it runs like a top. I have had to replace some wear items like jack shaft, axle and idler bearings, hyfax and I changed the engine oil after 5000 miles. You'll also find that you aren't spending a fortune on 2 stroke oil. Gas and go is a beautiful thing.
I am putting a 162 track on this summer. The factory 151 does okay, but the RX really needs a bigger footprint and more flotation. Another optional mod, but I think it will make for better performance.
The RX is heavy and doesn't do some things as well as some of the newer lighter 2 strokes, but it's reliable and after you get used to how it behaves, you can do a lot of good stuff with it. A turbo or supercharger will make the 4 strokes into mountain monsters.
Oh, by the way, boosting a Yamaha 4 stroke doesn't shorten the engine life provided you do it right. 200 hp is real easy and very reliable on pump gas. If you want big boost, you will have to do things like head shim, upgraded connecting rods in the engine, high octane race or aviation gas and a good fuel controller. It sounds like you aren't looking to do much big hill climbing, so boost may not be attractive to you.
Another fairly inexpensive mod that I would recommend, A roll over valve. Especially for fuel injected 4 strokes. What it does is close up the oil breather in the event you have your sled on its side or upside down. OFT Racing (he responded to your post a few entries up) sells them for under $200 and it includes a tether to kill your engine should you end up off of your sled. The kill tether is a real good idea for the fuel injected sleds since they will keep running when they are upside down. Not only is it dangerous should you end up pinned under the sled while it's running full throttle, if it's running full throttle upside down and pumping the engine oil out, it can damage the engine as well. I would recommend buying from OFT Racing as it's a local small business (out of Anchorage) and I don't think you can get a rollover valve system for much cheaper from anyone else anyway.
Ricky Coffman (owner of OFT Racing) is pretty much a Nytro god. I would recommend checking out his posts here and on Totally Yamaha and Back Country Rebels. He's done some amazing things with Nytros. In fact, he holds the state asphalt drag record on one of the Nytros he built. He's all about boost, but you can get some good ideas from his sled builds even if you don't boost.
I think you will love the Nytro after you get used to it. It will handle a little different than your Ski-Doo, and the power band is different but there are advantages. Fuel economy, trouble free engine, no 2 stroke oil, and robust clutches and belt life. If it's eating belts, there's a problem. I have about 2000 miles on my current belt and expect it will last a lot longer.
I was eating belts and went through two in about 500 miles a few winters back. The next summer I changed out my jack shaft and axle bearings and the problem went away. I assume that the clutch side jack shaft bearing was warn causing the secondary sheave to be misaligned. After changing out my bearings I gained a lot of power to the track and haven't eaten a belt since.
Anyway, I hope you are happy with your new sled. I sure do like mine. Be sure to check out Ricky Coffman's posts here and on Totally Yamaha. His username on Totally Yamaha is rlcofmn.