What symptoms do you get when a coil is starting to increase internal resistance. I have .6 ohms on mine. Its a 1996 warrior. The specs are supposed to be between .36 - .48 ohms.

 

.1 ohm is problably not enough to notice but since you asked I would say the spark would start to get weaker making it possibly load up under accel. and prolong idle. The plug should get sooty like it was running rich cause it can't fire all of the fuel.