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I have been assisting a friend in restoring his #7 Johnson Rocket, aka
"The Great Pumpkin". It had the O-435-1 (O-435-C), with the MA4-SPA carburetor. He had had the single-piece venturi installed when he bought the plane. It would cough and miss when power was reduced to 20" MP, making it unsafe to fly. In talking to El Reno Aviation and the Stinson Sentinel group on Yahoo, I found out that the single-piece venturi makes the MA4-SPA completely unusable in the O-435. I have been operating, under field approval, the MA4-5 for the O-435-A engine on the O-435-C, for the last 25 years. I also had a core carburetor and sent it out for overhaul/updating. We installed it on #7 (with field approval). I flew it today for the first time and had flawless engine performance! -- Remove _'s from email address to talk to me. |
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