Since new, my bike has been a bitch to start when it is below 40 degrees out.
Several things would help.....like turning the fuel off and running the carb dry whenever I get home....or tipping the bike over on its side to spill some gas over into the carb.
But they are a pain to do.
Others suggested re-jetting.....some people here had mixed results.
One solution that works is mounting up a pumper-carb. Kinda expensive though.
I found an alternative.
So I put a simple low-$$ fix which is a snap to install and flawless in operations.
I got a jet-ski primer kit ($15) and installed it on the bike.
When it is cold out, I prime it with a pull/push on the primer ****, pull the choke, and hit the starter. It cranks up immediatly every time.
Installing it was easy.
I cut the fuel line about 2 inches below the fuel cutoff valve.
I then inserted a "T" connector with a 1/8" connector in the middle.
Be sure to use clamps, as you do not want it to come loose.
I then connected up a 4-inch section of fuel line which came with the primer and attached it to the 1/8" T.
I zip-tied the primer on the mount for the idle-adjust ****.
I then drilled a small hole into the top of the plastic air-intake hose imediatly before the carb.
I glued on a 1/8" fitting into the hole and attached a hose to it.
I ran the hose under the seat and plugged it into the outlet of the primer