L.A.B. said:
It will either not engage when you kick, or it will slip out of engagement as you kick.
I was afraid that that would be the answer. My bike's been up and running for about two weeks. A week ago it started either locking up or making a ratcheting noise when I kick it over. It's coming from the gearbox. It's intermittent. When shifting through the gears everything is fine. I'll start pulling it apart.