Whitexc, If you look at the top of the page you'll find a link for the 4-stroke forum. Joinup over there and post this question in the RX/RS mountain forum. You'll have better luck getting your questions answered over there. There is an excellent thread by Kachess about 1 ton mountain sled modifications. Lot's of info and some vid's that show what an inexpensively moddes RX Mountain is capable of.
Dave