I guess I have to dig into it and see whats going on there.
If I override the governor by hand and rev the motor the issues seems to go away.
Also, if I push it to a lower idle it seems more pronounced. Just for giggles, add the recommended amount of something like Marvel Mystery Oil to the gasoline and run it for an hour or so.
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The problem I am having is that it has a slight skip at run speed...1800 RPM.
I think it is late 80's early 90's vintage (aluminum headed, I believe 1988 by the serial).
Since it is on a genset this creates fluctuations in voltage and AC frequency IE dirty power.
1000hrs doesn't seem like a whole lot given the usage...
I mean it's not on a chipper or trash pump or something that has run wide open most of it's service lie. The plugs that came out of it were blackish, definitely not tan, perhaps a bit rich, but doesn't look like oily deposits.
It's governed to 1800 RPM, it looks like it has been well maintained. I checked the intake and carburetor area for vacuum leaks with a rattle can of ether with no avail.Thus far I have changed the plugs, installed new copper core wires, new points, new condenser, cleaned the cap and rotor. I also ran a compression check which yielded all cylinders in the 85 psi range with little or no variation.Seems there is no published value for the compression range..a quick google search looks like 85 psi isn't anything to worry about.There isn't abnormal smoke out the exhaust and the crankcase doesnt have unusual blowby. Mike If you are reading 85 PSI in all cylinders, I don't think you have a valve problem. It sounds like you are running a tad rich, or you are running with a very light load all the time.The carburetor and fuel pump both have service tags indicating a rebuild on them within the last few years. If there is no main jet adjuster, then I would check the gaskets in the carb, and the float level.I'm kinda scratching my head at this point, and it is a little outside my realm. Too high a float level setting or a bad carb/fuel bowl gasket, will cause a rich condition.