RE: Cleaning Solutions
I just did a number of older engines with the Dawn Power disolver, and found it works great. In the past, I've used a product that used to be sold for cleaning glow engines, can't remember the name, but it used to require setting a half hour or more before rinsing off. I cleaned off an old Cox Golden Bee from castor oil goop and assorted other crud from 40 years accumulation in just 15 minutes. I just applied the Daw, let it sit about 5 minutes, then cleaned off with an old tooothbrush and warm, soapy water. Just had to repeat once on part of the cylinder fins.
My experience with all synthetic fuels gave me the impression that while they might be great for most newer engines with things like AAC, ABC, ABN plating technologies, but if you have older iron piston/steel cylinder engines, have aat least 20% oil, and at least half that oil being Castor. I wrecked a couple very good steel/iron engines the first time I tryied all-Syn fuel