Ah... thanks MJay... I 'll check it out..!.. I also need to put tethers on our sleds... where have you found is the best place to put 'em..??..
Put the tethers on mine right next to the key. The AC tether is a plug in model, no cutting/connecting wires. $25.
The M7 I have has only 1300 mi, but I've had no problems with it other than the coolant bottle finally warped a little this year and the cap popped off (30 mi from the truck!) from being too close to the pipe. You can add the heat shield form the newer models, and if it is warped a little, bend the tabs in on the radiator cap a little.
Add the heat shield under the ypipe to protect the injectors form heat (from the newer models).
Change the DD oil every few hundred miles. It will weep a little oil from around the top shaft seal. This is the vent and is normal, unless you see any drips on the floor, then it's leaking too much and a seal is probably bad. These won't survive like a chain/case with low/no oil.
Holz rear susp bracket for the front arm mount is a must, rear susp geometry is effed up without it. Read up on this and the Geo Mods to help the rear susp. It's actually quite nice after a little work.
Get the Sno Pro ski springs for the ski bolts, in place of the spacers. Eliminates darting on the trail. $4/ea and the sled handles ALOT better on packed trail.
Ice scratchers probably needed, but I've found that the M sleds do alright unless there's no loose snow on the trail.
Has a lean spot at part throttle 6000rpms??? Make sure you don't just run constant throttle at around 30mph for a long time. It would start running hot, presumably from running lean, when my wife would just "cruise" on it. If you varied the throttle in the same conditions, no overheat.
Have fun!