Kick Starter Failure

I seem to have broken some internal metal pieces that are intregal parts to the kick starter. I was kicking the bike over yesterday and all of a sudden after a kick the starter lever stuck in the down position and would not return under its own power. The only way to get it back up was to manually pull up on the lever and it was not easy to do. So I took it apart this morning and there are two metal pieces that have broken. One piece is bolted to the engine case by 3 10mm bolts( it looks like a quarter moon shape behind the kick starter gear), the other piece that broke is part of the kick starter gear assembly (ratchet wheel, I think). One of the tabs has broken off.

Was I kicking to hard? Or are they just old and worn out? Parts? Would a Yamaha dealer have this stuff?

Any input from anyone that has had this happen would be great. It looks like an easy fix if I can find the parts.

Curt