what weight of oil are you currently running? this is in the Honda cm400? it should have 10W40 if I remember right, I've had good luck with the Amsoil motorcycle oil in cold weather, ran it in my Yamaha RD350 all year when I had it, and because it was only in the gear box it took a while to heat up, even longer in Wisconsin in the winter, and never had make the clutch act poorly.
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