My F2 has had some trouble as of late. It has begun getting cold here (NC - maybe mid 40's in the morning) but the bike never seems to come up to operating temp no matter how long I ride it for. It's always a hair above the first tick mark above C, never really moves. Down low, it seems to sputter and buck far more than it did in the summer time. Is this common? Do I need to do a retune for the colder temps? To me, it feels like it's overrichening the mix, but I'm a car guy and this is my first bike... so I may be way off Many thanks!