![]() ![]() ![]() Right now, head down to your local motorcycle, snowmobile, or auto parts store and buy a full color plug chart. Each one of these conditions causes certain effects in your engine and changes the color of the ceramic insulator surrounding the center electrode of a spark plug. Your engine will burn three types of air/fuel mixtures: (1) LEAN, meaning less fuel compared to air (2) PERFECT, the proper balance of air/fuel and, (3) RICH, more fuel compared to air. This is known as taking a spark plug reading or checking plug color. ![]() Long before we had modern electronics, old time mechanics could tell you exactly the condition of your engine by looking at your spark plugs. Frankenstein’s laboratory, I want to say, “Not a chance!” If this conjures up visions of computers, oscilloscopes or Dr. What I want to give you is a reliable system of engine tuning & combustion chamber monitoring and power output. Could be you just can’t stand a stock engine! Possibly, changes in carburetion, exhaust system, or other modifications were necessary to make it fit. I’m sure you have your own pet powerplant ready to be installed in your dream machine. In recent years the Homebuilt Rotorcraft industry has been exposed to a tremendous variety of engines, both off-the-shelf and out of the salvage yard – but little is known about engine tuning. ![]()
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