Loose timing belts - they were both like this.

Worn emulsion tube - new one is on the left.

Countershaft retaining plate. This plate should be one thickness, these teeth have worn down over 50%. The bike this came off of had an indicated 20,000 miles on it.

Starter terminal - these corrode so it's easy to destroy the brush when you try to remove the cable. Do not let it spin when trying to remove the nut! If it does, it's rebuild time.