Ive got a k6 gsxr 600 and it had a stator burn out a couple months ago, and i got it replaced with a brand new one. The battery was also replaced with a new OEM one, and the rectifier was still working fine when i did the stator swap. Its been working fine ever since until now.
Only on cold starts (when its around 60 or less), the bike seems to take longer to start. As if the battery was dying, but it does start up eventually. Any other time during the day, it starts up fine. Its only at night when its cold. Lights and everything electrical work fine and it shows no FI light.
It could be battery, charging, wiring or starter. No magic answers here.
A voltmeter is your friend here. Start with cranking voltage, charging voltage, etc. 90% is in the service manual plus there are lots of threads here if you search for them.
Id figure if its the charging system, it would struggle to turn on at any temperature. This problem is only in cold weather under 60 degrees.
Plugs where replaced right before i bought my bike, so there should be enough spark.
Im gonna try raising my fast idle abit, see if that works. Ill try it out tonight again.
Ok so i raised the fast idle from 1500 to around 1900. And it started up instantly. Ill try it out tomorow when its really cold to test it out. Hopefully thats all it needed.