I've got a backcountry xm chassis 800r all of a sudden when i start it usually takes me one pull 2 at the most it fires up and runs, as soon as I give it throttle it dies but restarts, same issue, yesterday I did keep playing with the throttle until it throttle up and took off but would not run past 40 mph after 3 miles in good snow she overheats and I shut it down, got it back home started it again same thing over again. Put new plugs in it today with no change and i did index them correctly, any thoughts out there what's going on with this? It now has 1600 miles and all but 50 has been u.p. riding. Thanks

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