1. Plugs.
a. Short circuit. b. Broken porcelain. c. Too large a gap.
2. Cable.
a. Broken. b. Grounded.
3. Instrument.
a. Dirty carburetor. b. Interrupter points on magneto.
B. Carburetor.
1. Water in carburetor. 2. Dirt in the line. 3. No pressure or no gas.
4. Too lean a mixture.
C. Engine.