My bike started one day and the very next day I couldn't start it (Outside temp is in the high 40s). When I try to start up the bike I get it to turn over but it wont start up. If i try long enough (while giving some throttle) I get a back fire sound from my exhaust (with some flame). I figure I should change my spark plugs but I wanted some other opinions on what I should do. Please respond with suggestions and directions on how to trouble shoot.

 

Good questions there.. I'll do my best as will other members to help to out. What model cbr is it? Here is a link below that should help you out if not solve your problem.. A lot of us owners have troubles so it's great that we can all learn together.. Try this post:
Cbr starting issues