winter jetting

i have a 08yz 450f in wisconsin, and am looking for jetting #'s for the winter/ice season. any advice would be great

Rule of thumb: Increase your jet size by 2% for each 15 degree (F) drop in temp, both pilot and main. Example: jet at 70 was 165, jet at 25 should be roughly 1.06 of that, or 175.

It will help starting to also bump the starter jet up some.

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