Well, I assembled the engine with the new bearings, and mounted it to the Yak with the cleaned muffler and I'm happy with the results. I would recommend this cleaning method to anyone in the future. Thanks for the tips!!

Cracking result!

I tried the pure antifreeze crockpot method as described here. Green antifreeze with the phosphate. Turned my os LA 40 parts dull grey. looks like crap.
Unless someone can specifically specify what exact type of antifreeze they are using (chemical composition) I would stay away from this process. Its a crap shoot.

I use the "crockpot method" at least 4 or 5 times a year. Make sure you set the temperature on LOW. If it is set on high, you will cook that engine and it will change color. I use Prestone antifreeze. Yellow container...undiluted. Not the premixed stuff you can buy in the stores. The antifreeze is green in color. I soak overnite on LOW temp. Never had a problem. Good luck

There is a fresher thread on this in Q&A that just started.

A lot of people clean their engines due to the external appearance. But you should examine the interior of the engine from time to time. For instance heavy deposits of varnish on the piston walls or sleeve can cause excessive drag on the engine which will present itself as an engine that has difficultly maintaining a reliable idle.