I am looking into this issue as well. I've noticed last season that my idle RPM was a bit high (1000+ rather than 800). This season the engine is running a bit rough at idle, which may still be somewhat due to water in oil issue that I had earlier. I am primarily looking into possible sources of air leaks in the carburetor. But I also came across some older posts by Dave Neptune where it was suggested that RJ12C gap should be close to 0.040 with EI. Default gap for RJ12C is 0.03. I think I saw Dave say that increasing gap would improve engine running at idle speed. Is this the case?
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