This is interesting (http://www.continental.aero/engines/200.aspx). Raising the compression from 7:1 to 8.5:1 in the O-200-D doesn't change the rated...
I did that trip a few times either IFR or on top in a Maule or C-185. Pre-GPS with NDB and VOR/DME. Always wondered where I might be if it got quiet...
Mike, you might first try to rotate the tach (in the correct direction) with a variable speed drill. Not sure what it will take but likely something...
From what I've read it helps to keep the oil from getting bulked up with combustion byproducts. That can lead to excessive deposits. How much is too...
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