Some words of wisdom when dealing with Onan engines: proceed slowly and look carefully as they are quite expensive to replace parts on. As my father used to tell me: Think twice, measure ten times and then cut once. I usually approach Onan engines with ths mind set. They are a little different from the Briggs and other engines. Most of my dealings has been with the CCK engines that powered generators and welders plus the NH model that I personally own. Occasaionally a few of the ones like you are dealing with on a few high end lawn tractors. One problem I had found on several of the CCK series and on my own NH series engine was that in the breaker point box there is a rubber seal thingy at the top of the the push rod hole and sometimes it acts like a pump to draw oily vapor up into the point box and gets the oily vapors on the points. When that happens remove and discard the little rubber seal looking thing on the push rod. It does as much harm as good sometimes. I also ran into a situation one time with own my engine that I could not get enough lift from the push rod to properly gap the ignition points and finally determined that the push rod had worn off at the end and was a little too short. I made a new push rod that was 1/8 longer from a brass rod and it has run well for several years now. The real Guru for Onans is a guy in Texas by the name of Billy Shafer who ocassionally will post on this board. He has forgotten more than most of us will ever know about the Onans especially the generators. He is slso active on the SmokStak forum.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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