Mountain as trail sled

If you put a cross country track on an rx1 mountain would it be ok to ride on trails in upper WI? Also what's the difference between a mountain and a 121? Obviously track length but jetting, etc? Thanks.

jetting would need attending to as they are jetted leaner for the mountains. easy way would be to throw a set of used carbs from someone at same elevation that you have personally cleaned and synched. ski stance will be narrower but that is minor. only other things are clutching and gearing. you will need to do the clutching no matter what and i reccomend ulmerracing's kit. allen is awsome to deal with. the gearing might be ok for you but that is easy to change once you get the clutching done.

x2 on what maim says, except gearing first then clutching.
You can find a set of RX-1 A-arm in the classifieds I'm sure of, and a set of shocks to go with them. You need 4 x 135 main jets for lower altitudes, it's a small job. Handlebars are taller on the Mountain.
That pretty much cover it.

Thanks guys I ended up buying an 05 rx1 121 instead.