Cool outside? Bike won't start!

[97gs500e]

This is weird, and I've had this problem since I bought my bike 4 months ago.  It seems that if its below 70-75 degrees F outside, I cannot start my bike, at all.  It cranks and just barely turns over, but won't start (even on a push start).
I've kreemed my tank and replaced the fuel lines recently.  I have a new battery (fully charged with enough electrolyte) new(er) spark plugs (correct heat range and gap) and a new air filter.

If its warm or hot outside it will always start, but sometimes requires a push.  

Any ideas??

[davipu]

have you ever played with your idle mix screw?

[scottpA_GS]

You are using full choke right?? and hit the throttle a bit on start as well??

Could be your choke is stuck closed??? check the choke lever on the carb.. work the choke lever and make sure all is moving ok    

Just a guess.. something to try

[RVertigo]

have you ever played with your idle mix screw?

I play with mine all the time...  Oh... You meant...  Riiiight.  :lol:

I need to get my mind out of the gutter.

[97gs500e]

yes, I've been using the choke - there's nothing wrong with the choke.  Adjusting the idle screw hasn't helped...

[callmelenny]

Does it sound like it is turning over at a slower speed in cooler weather? Have you checked the battery condition?

:dunno:

[Catcams]

Same thing has been happening to me since a few days.
Temperatures drop around the Same.
Bike does not start instantly once I push the start button.
It cranks & will only start when I twist throttle...it was barely able to start.
It stalls at every corner