Dave:
I am having probles with my 63, will die during flight. YS 20/20 Powermaster fuel, 12/4 prop, YS plug. Have checked for blockage, replaced regulator spring, diaphram, plunger and the rubber plunger seat. My question is, I had the pressure housing off so many times, I forgot which way it goes back on the engine. One side of the housing has a buildt up rib on it. Does this face the prop or the engine housing? Question #2, I ordered the plunger from Central Hobbies twice by part number off the instruction manual. Both times they sent me a smaller diameter plunger, about 1/2 the diameter that was previously in the engine and it had a different part number. Has the plunger been changed in both size and part number?
Thank You
Paul Eagon