tough thing about winter tuning is the moisture level in the air. you can have cold dry days and "summer" jetting will be just about fine. get a really moist day with temps just above freezing and you've got some crazy good air and will need to richen it up a lot. couple days later it'll be too rich if it gets really cold and dry again. went bonkers with the rockhound last winter. thankfully she's still in waiting for mods mode and parked non-running under a tarp for the winter.
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