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Showing results for tags 'Mag check; backfire'.
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What could cause a single backfire when conducting a mag check on the right mag? How serious is this and what should I do before my next flight? Since my last annual last summer, I've been experiencing what I believe is a fouled plug when I conduct the the the before takeoff runup check on the right mag. So, to preclude putting the airplane away with a fouled spark plug, I added a preshutdown mag check after my mag ground check before engine shutdown. Ground check was good, left mag check was good with a 50 rpm or less drop, but right mag check at1700 rpm caused just over a 100 rpm drop and a single, loud back fire, followed by a return to normal rpm. Would appreciate any advice -- Bobby Rakes, 573.337.3447, rakes_bobby@hotmail.com, N6094Q, 1966 M20C Mark 21, Lycoming O-360-A1D.
