Hi,
I think that I went through all threats about starting cold engine issues but that did not help me.
I have problem to start engine only in a morning but after that during a day is fine. Even after work where bike is not used for 8 hours then it starts properly.
Battery has been changed recently, so it is not an issue but today morning for the first time new buttery run out of power because engine could not start. I had to wait 20 minutes and then it started.
Battery voltage is 13.5.

I did few things to fix problem, like: changing spark plugs, set proper gap in spark plugs. I have also checked charging system but results surprise me a bit. Charging voltage on idle engine speed was 14.5 but when I increased engine speed to 5000 rpm then charging voltage dropped to 13.2V. Thought, that charging should go up to max 15.5V. Spoke with local mechanic and he said that this is correct.
I also found that unplugged spark plug cap from spark plug has lots of little sparks on its side to the cylinder when engine was running.

Small thinks which probably does not matter:
1. Before winter I had to send my bike for service because it was noisy like diesel engine. It has been fixed but since that bike was not starting like it did before and it was getting worse and worse till now. Also choke cable does not work that smooth like it was before.
2. Before, engine was running nicely with full choke cable on (off course when engine was cold) and I had to close it ½ way through because revs were to high. Now, few seconds after when engine starts I had to set choke to ½ way through, otherwise revs were go down by itself and engine behave like it has too much fuel.

Please help

 

Pull the tank and airbox to check the routing and set of the circuit enrichers (chokes). Bubba Buttcrack down at the service bay isn't known for attention to detail. A kinked or misrouted cable would cause that.
Check that voltage level with a load on the system, the high-beam on for example. That's suggested in the shop manual and yes, the output should go up as the rpm's increase, 14.5 is plenty to charge the battery, much more will cook it. Book says 15.5 is the max, but sounds hot to me.