Consider review of what has been shared.
Just noticed reference to kilometers so this is a cold weather bike with probable salt road exposure.
Make sure to clean the idle control motor shaft and linkages too.
The engine temp sensor would be a main suspect with idle control motor as second most probable so it needs to be reviewed.

 

whoa there.

How 'bout checking fault codes to see if he's thrown a 14 or not? we might save this guy a Benjamin.

OP: Look up how to retrieve fault codes for EVO Fuel injected harleys. Should be instructions or a youtube video out there. It's also in the HD service manual. Basically, you turn the on/off switch as follows: ON/OFF ON/OFF ON. Then you wait and count the number of flashes that it gives you. Little bit more to it than that so look it up.

carl

 

Good idea always best to test parts first