Caution: Wear safety glasses in order to avoid eye damage.
| • | Broken teeth (1) |
| • | Damaged teeth (2) |
| • | Chipped teeth (3) |
| • | Worn teeth |
| • | Uneven wear on the edge of the teeth |
| • | Worn valleys between the sprocket teeth |
| • | Crankshaft sprocket keyway for wear |