For past two years I ran the KDX in the Québec winter, no problems just BIG fun. Hard to describe how much fun it is.
Modification I use for the winter:
Trelleborg Tungsten carbide spiked front tire
Ice screw rear tire (approx 250)
Richer carburation
Light fork oil 2.5w or less
I go for rides when 5 to 20F outside.
Be sure to oil your air filter the same manner you do in the summer or Ice vapors or snow in the air will enter in the carb slide and freeze wide open. Belive me this is a heck of a feeling
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