You need a fatter jet in colder weather, since the air is more dense. Jet sizes are in millimetres, so a 110 is 1.1mm, a 115 is 1.15mm etc. Before changing jets, evaluate how the engine runs and go from there. Does it fail to idle? Does it bog when you first open the throttle? Does it have a hiccup at mid-throttle? Does it feel like it's running out of gas at WOT? All of these questions need answers before changing jets. A plug chop is also wise.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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