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CLEAN MACHINES

  PHOTOS BY DAVE GIERKE & PETE HALL EASY WAYS TO REMOVE STUBBORN ENGINE VARNISH   During a recent flying session, your engine let you down bigtime: it flamed out during a hovering maneuver at low altitude. What went wrong? The mill was almost new; you had run only about 10 gallons of fuel through it since break-in. I'll play detective and ask several questions regarding this engine's operation during its final flights. Did it...

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