I recently purchased a '61 Forney F1-A. Shortly after getting it home after approximately 10 hours in my possesion, it suddenly began running rough on a short local flight. After a precautionary landing it ran up without problem. The plugs were fouled with dry carbon and lacking any previous history as to how long since the plugs were cleaned, I cleaned them and began cautiously flying again. Within about 10 hours, the same roughness beset the engine and I contacted El Reno Avaition. Two facts emerged. The carb was actually from an O-200 and it had a single peice venturi. If you think that is rich in an O-200 you ought to see it in a C-90!
According to Ted at El Reno the only difference between the C-90 and O-200 carbs is the nozzle, a 47-850 in the O-200 vs. a 47-853 in the C-90. I just received the new nozzle today ($135) and have not put the coupe back together again but am confident of the outcome. If anyone needs the 47-850 nozzle and an O-200 carb data plate, contact me at 505-531-2270. Dick Chevalier
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