I proceeded to clean the valves and intake/exhaust ports in the method described in this video. It involves a brass brush in a Dremel for the ports and a brass wire wheel in a bench grinder for the valves. The trick is to mount the valves in a drill, so they spin while you clean them and they're easier to hold. Everything seemed to come out really well, so I'm happy.
This project also involved mounting and using my Black Friday bench grinder for the first time. I actually had to Jerry rig it for the wire wheel to work.
|Notice the removal of all safety guards.
Here are all the valve parts, sorted neatly.
And the naked top end.
Here are some before and afters:
|Before - Exhaust Port
|After - Exhaust port
|Before - Intake Valve
|After - Intake Valve
|Before - Exhaust Valve
|After - Exhaust Valve
I had planned on letting professionals do this, but the video gave me confidence. It really isn't that tough, at least when you have a simple engine with four valves.
The next step is to re-seat the valves with some grinding compound.
*I might start a dead blow hammer fan club.