Winter temp jetting

Need some help. I have a race this weekend and the temps are going to drop....lows in the 30's up to low 60's. I have done the BK mod, running 168, 45 combo and C12 gas. Should I make any adjustments? Cooler wheather will cause a lean condition? Any help would be appreciated.


I don't know what specific jetting you should change to, but yes cooler temp. = more oxygen which means your bike will run leaner.


Do you have a practice on Sat or the morning? I would say let it alone. I was in the same boat a couple of weeks ago. I noticed the bike being a tad lean in the morning hours when it was brisk but come race time the bike ran fine. Even when it ran a touch lean in the cold weather, the bike still ran good. I would suggest taking a couple of different size larger jets and if you notice a huge problem after morning practice possible go up a size. Course by race time, if it's around 60. I don't think you will have much problem if the weather you are riding in now is the 70's.

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