Alright, so tonight I went out to go for a ride. Just around the neighborhood, nothing very far because it is cold as hell out but I felt like going for a ride. So the bike starts up and idles fine...takes it a couple mins longer to heat up but no prob. So I go out for my ride, it accelerates nearly perfect through first but when I shift to 2nd or anything higher, it starts sputtering and even stalling after about 5k rpms. I had to put it on full choke just to keep it running. I was out for a ride last night and it was running perfectly. Do you think it has something to do with the cold weather? Any input would be appreciated. BTW its a '97 CBR600. Thanks guys.