Ignition checks
in 912 / 914 Technical Questions
11 years ago
I have a skyranger with 912s that I bought last year, that had a prop strike, and sat for 5 years. I've had the gearbox checked and certified ok, and had a crank runout done at 0 runout . It starts easily, and seems to run alright. I can't seem to run it up over 4000 rpm's when it runs rough. It seems to idle fine, but with a deep mellow kind of a vibration. When I flip the ignition switches to test the modules, the right switch doesn't effect the engine but very little. When I flip the left switch, there is a huge difference in sound and rpm's. we have switched the plugs on both sides of the modules to test the wires and mods. Even switched the plugs! The problem remains the same oN the left switch. The carbs are in sinc at idle and up to 3000rpms but change above that. Found out today that the previous owner/builder had the same issue! My A&P is baffled, and so am I. What should we look for?
