Beginning last fall my g5 has been stuttering and loosing power when cold(outside temp <50F) most noticeable when getting on the highway about 1 mile into my morning commute. I do not typically have any issues on the hilly 30mph street leading up to the highway, but when I try to accelerate up to 50 from a stop the bike will go between full power and hardly anything. Once finally up to speed the problem mostly goes away, and there is no issue once the bike is warmed up. Another possibly related issue is that I intermittently have difficulty kick starting the bike(I know how to find tdc), and the bike will sometimes not idle when cold with out a bit of throttle. E-start is fine as long as I give the throttle a slight twist.
I initially assumed this was related to my terminally leaky exhaust header gasket but that has been fixed.
The bike has 3300 miles on it, runs great otherwise, and the spark plug has been replaced.
Possible causes to look into:
paint in the fuel filter
loose electrical connections/low battery
EFI not properly mapped for cold weather
Any other ideas?