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Well, you have to at least start off with the right kind, some have the check valve at the top of the hose, you want it at the bottom at the cylinder connection.

What Al says. Especially if new rings, look for compression increase. Some gauges read low too

Right Gar, I know that is one general consensus. I did some experimenting around, after reading a lot of conflicting opinions on which type oil to use on a modded saw that was going through break in. With the synthetic on a Husky single ring, I was getting a lot of resin coming out the exhaust...

If you put in new rings, I'd run petroleum based two cycle oil until it's broken in, then switch to a good synthetic. Look for sights and sounds of overheating.