Wayne, Take a good look at the hot air flap. Mine was installed on the top of the
shaft (engine side) whenit is supposed to be installed on the outside of the shaft. Two screws hold it in place. Mine was installed on the engine side of the sshaft, one bolt failed, ond the flap was now able to close up the air flow/restrict the air flow,etc... However, I was able to obtain almost full power, tho not fulll fower. Only 1500 RPM seems strange... As I understand your posting, the engine performed properly on first flying ---failed during flight... Sounds like you got a Bug in the carb jets, Maybe....The float chamber is vented to the outside of the throttle plate, and if this gets plugged, then the mixture goes haywire ---one of the reasons for air filter. I wouldf remove the mixture control assy, and check the passageways, and the small mixture control disc with holes in it. (three holes, I think). Also, was the fuel line replaced? There was a case I remember that the fuel line was replaced ---too small diameter - restricting the gravity flow to the carb. He could get full power on take off, but only about 1800 RPM around the pattern to land. I understand they traced it to a too small inside diameter hose from the firewall to the carb. Interestingly, they were able to easily stretch the "too small hose " over the fittings, so thought all was OK. Unlikely the mags would change during flight ----unless they are loose on the mounts.... Also check the flow of fuel to the carb - hosae disconnected. You could have a restriction in the center cowl tank outlet. Hope these thoughts help... Harry
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