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Here is a strange notion. I thought that the burnt valve was the only problem I had with mine, but my dad advised something strange. Pour gasoline into the cylinders on top of the pistons. I rotated the engine to make sure nothing was top of stroke. I noticed that when I poured it in the gas in numbers one and three stayed there, while the gas in number two ran out quickly. He said this indicated bad rings or piston. Sure enough the second piston, when I removed it, was cracked from the bottom of the skirt to the top of the "dome". I do not know what would have happened if I had subjected it to full compression.
We used gas because it is so thin that it will run better than water, and after you soak it up with a paper towel the rest will evap quickly.
It's a strange notion, but a lot of piece of mind.
WARNING: Even if no gas appears to run through the engine always drain and change oild before starting engine the first time. you do not want gas to stay in there.
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