Gort
Ex Member
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1. Weak Spark
2. Erratic Spark
3. Fuel Mixture too Rich, Due Too: a. Incorrect mixture adjustment. b. Dirty Air Filter. c. Choke is on, even if the knob is pushed all the way in. d. Slightly ruptured or pin-hole in Savage petcock diaphragm, allowing vacuum hose to suck fuel.
4. Too cold of a range Spark Plug, or Spark Plug set wrong, or Spark Plug is defective (check for fractures in the insulator and in the nose porcelain.)
5. Oil fouling, Due to: a. Worn or cracked piston rings, or cracked piston. b. Worn Valve Stems, or valve stem guides or seals, depending on what an engine has. c. Scored or ovaled cylinder.
6. Timing too retarded, which can happen despite your setting it correctly by eye, if the ignition system is controlled by a defective ECU management system.
7. Wrong Carb Jet size, without having made additional engine modifications to accommodate the increase in fuel being delivered to the engine.
8. Very old gasoline, or contaminated gasoline. 9. Internals of the muffler have collapsed due to rust or fatigue, producing a partial blockage.
10. A engine without an electronic fuel management system, whose carburetor is not jetted for high altitude, but is always operated at high altitude.
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