The last major piece to reinstall on the engine was the valve cover. I was hoping to be able to dunk the whole thing into my 5-gallon parts cleaner bucket before painting, but it turns out that even parts cleaner freezes solid when it is left in the shed over the winter. I was forced to just use some de-greaser and Scotch-Brite pads to clean it up before painting.
When I originally obtained the 1981 Suzuki GS650L, the two pieces that had been removed from the bike were the carburetors and the valve cover. The original owner had planned to polish the valve cover, but it is not the right material for polishing. The carburetors were removed trying to get a shop to do the cleaning, but the quote was more than I paid for the whole bike.
The valve cover was a bit discolored to start:
With de-greaser and Scotch-Brite pads it was looking just a little better:
Similar cleaning and sanding was done with the breather cover and starter cover:
Right away, with a few coats of primer and paint, these pieces were looking much better:
After a quick double-check of the valve clearances, everything was put back together and torqued down to spec:
And now, as soon as it gets warm enough to get the Ducati Multistrada out of the shed and create some working room around the frame of the GS, it is time to get this engine back outside and get it back into the frame.