In colder weather, you might want to try running a hotter plug. Your bike likely came with a BR9EG or variation of that plug. Try running a B8ES - available at AutoZone or Advance for $2.
Clean your air filter, too.
Is this bike new to you? Do you know any of it's history - like when the last time it had a new top end? If it starts easily, you likely have decent compression. But if you just got it, it could need to have the jetting adjusted to suit your area.
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