Uh...need some more info. Hard starting is usually due to one or more of the following: Old gas, no gas, clogged fuel line, low compression, weak spark, wrong jetting, choke problems, kill switch, mice living in your pipes...
Start with the easy stuff. Remember that factory jetting only covers a stock banshee down to 60 degrees. Below that you'll have to rejet. Also if you did any mods and didn't rejet you'll be having problems. Is this a new thing or did it just start? If it just started then what did you do beforehand? Did the temperature drop? How do the plugs look? How's the compression? You'll have to do some homework before we can give you a better answer.