Ensure the needle valve has not "worn" on its "sides' (Examine closely ?7 if "needle wobbles in the "seat, REPLACE!---Simple test>Turn off fuel supply, as travelling ,& IF Machine begins to accellerate , quickly lower throttle setting & turn( switch)- fuel lever to normal "ON" --Good Luck, Des PS/- I presume this is not EFI or DFI equipped,---If so Disregard above solution!
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I have a 00 700 XC and my temp light and engine use to do the same thing. I raised the hood once and noticed the temp sender wire had rubbed bare and a cylinder head bolt and was shorting out. Just an idea??? Not sure if it would cause it to run rough though, it seems as if mine did as well a few years back.
i have a 98 xc 700 and had the same problem and it was the voltage regulator. make sure and get one from polaris because they can be touchy with an after market vr.
when it stalls, is it on a warmer day? ie 20+ degrees? is it overeheating or hot? If you have never had the carbs serviced, the summer/fall may be a good time. inside the carbs, you have differnt circuits, they may be gummed up. Good luck
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