I could use some help/ideas. I have a MH 44. It is a 44 GR, 4-cylinder, gas, S# 12653 with a Zenith carb and Continental engine. It starts fine and runs for about 5 minutes and dies. Minutes later it can be restarted, and runs for about 30 seconds and dies. There after it will start and maybe run for 10 seconds and die The choke can be pulled and pushed and it will sputter on for a few more seconds and then die. The carb was just rebuilt. The carb was just recleaned. The fuel line filter is brand new, the glass fuel filter bowel has been removed because the bowel screen was tore. The gas tank outlet is not clogged. The gas tank has been drained. It has new gas. Fuel flows freely and evenly through the fuel line to the carb. The carb inlet elbow is not clogged. The electrical coil has been replaced. Electronic distributor parts have been installed to replaced the points & condenser. The timing has been set and is good while running. The governor moves freely. The carb jet settings have been adjusted/altered with no change in the dyeing situation. Air suction at the air inlet of carb would take a glove off my hand. . I noticed ice crystals appear on the manifold, where it is connected to the top of the carb, and the crystals go up about 3 inches on the manifold. . Another note, when I recleaned the newly rebuilt carb, and was blowing out the carb orifices, it appears a "leg" of the new venturi, where it is pressed into the carb body was placed so it was somewhat blocking (not totally) a port/orifice that would feed into the venturi. Didn't look normal, but don't know. Any suggestions to try would be greatly appreciated.
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