Well, yes, then it's not so easy.
In my experience, the jetting difference between summer (20C) and winter (-10C) is small. I rarely change anything for the winter, but I run a Lectron.
What i would do in your case is depending on the type of race. You rarely foul a plug if you are able to keep the revs up and it's not too gnarly. Bring a spare plug with you. I would consider using a hotter plug, I run my bikes on NGK 7 plugs (BP7ES or similar). I guess your manual says to use a 8 plug? (depending on engine size).
If the track is tight and you rarely open the throttle, I would perhaps chance on going down on the pilot jet.
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Anders
"So you know, that you're over the hill when your mind makes a promise that your body can't fill" (Little Feat: Old Folks Boogie)
2015 EC200 Racing: TE bars, Rekluse Core Exp 3.0, 38mm Lectron & Ohlins S3 steering damper
2006 EC200: 2011 plastics, Rekluse Z-Start, revalved KYB forks & Scotts steering damper
1998 Bimota Supermono
1986 Duc Mille S2
1975 Guzzi sidecar hack
1961 Morini Corsaro 125
etc
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