125-200cc Kickstart gear slow to engage

We are having an issue on the 2012 WR125 with the kickstart gear not meshing/sliding over/engaging easily every time. All of the gears look great, it just doesn't slide over consistently. Is moves smoothly and with no seeming resistance, just doesn't travel the full distance unless it's done with a forceful stroke. What do I need to look for? On our CR 125s, easy strokes engage fully, every time... Thanks.

Kickstart gear is getting hung up behind idler gear. Had slight burrs on the backside of the idler and is slightly sloppy between the idler shaft and the needle bearing. Deburred and polished the gear/teeth. Some improvement, but not much.