I posted this long ago but the problem still never got fixed grrrrr rrrrr rr. Its tractor related cuz I use my motorhome to pull my tractor to tractor shows???? I have an Onan 2 cyl 4 KW Genset with old fashion points, condensor and carb. So far I have installed a new Onan coil, new points set correct and condensor and plugs and thoroughlly cleaned the carb including its nozzle, needle n seat, power adjuster valve etc etc. It has an electric fuel pump which seems to shoot fuel real well into the carb. Heres its problem: It has a good hot spark, starts well and runs the AC, but has an intermittent stumble where it cuts out n spits n sputters and shakes, maybe a bit of black smoke, but then catches up n runs without completely dying. Ive heard of their valve guides n stems carboning up, but one thinks after enough running with Mobil 1 it ought to clean up?? Ive also heard of loose valve seats ????? ???? It seems one of the plugs may blacken and soot up more than I like instead of that nice warm gray color, but I adjust the power valve screw to where she runs best under a load and DO NOT have it set too lean or too rich. If it ran bad all the time I may figure her out better, but that runing fine with occassional cut outs has me cornfuseddddd ddddd d. Although I set the power valve about right when loaded (about between where she leans out or loads up) and shes not blowing any black smoke whatsoever, the exhaust has a tell tale smell of one thats runnign too rich?? Any you Onan men or others got any ideas????? ? If its not carb or ignition, Im awfully afraid may have to get into the valves grrrrr rrrrr rrr. Thanks n God Bless Yall John T
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