Distributing brush broken. Engine misfires. New brush.
Oil soaked winding. Engine misfires. Clean.
Magnets loose on pole Engine misfires. Tighten screws.
pieces.
Armature rubs. Engine misfires. Repair bearings.
Bearings worn. Noisy. Replace.
Magnets weak. Weak spark. Recharge.
Contact breaker points Engine misfires. Clean.
pitted.
Breaker points out of Engine misfires. Reset.
adjustment.
Defective winding (rare). No spark. Replace.
Punctured condenser (rare). Weak or no spark. Replace.
Driving gear loose. Noise. Tighten.
Magneto armature out of Spark will not fire Retime.
time. charge.
Magneto loose on base. Misfiring and noisy. Tighten.
Contact breaker cam worn. Misfiring. Replace.
Fibre shoe or rolls worn Misfiring. Replace.
(Bosch).
Fibre bushing binding in Misfiring. Ream slightly.
contact lever (Bosch).
Contact lever return spring No spark. Replace.
broken.
Contact lever return spring Misfiring. Replace.
weak.
Ground wire grounded. No spark. Insulate.
Ground wire broken. Engine will not stop. Connect up.
Safety spark gap dirty. No spark. Clean.
Fused metal in spark gap. No spark. Remove.
Safety spark gap points too Misfiring. Set properly.
close.
Loose distributor terminals. Misfiring. Tighten.
Contact breaker sticks. No spark control. Remove and clean bearings.
Magneto switch short- No spark. Insulate.
circuited.
Magneto switch open circuit. No engine stop. Restore contact.
STORAGE BATTERY
DEFECT TROUBLE CAUSED REMEDY Electrolyte low. Weak current. Replenish with distilled water.
Loose terminals. Misfiring. Tighten.
Sulphated terminals. Misfiring. Clean thoroughly and coat with vaseline.
Battery discharged. Misfiring or no spark. New charge.
Electrolyte weak. Weak current. Bring to proper specific gravity.
Plates sulphated. Poor capacity. Special slow charge.
Sediment or mud in bottom. Weak current. Clean out.
Active material loose in Poor capacity. New plates.
grids.
Moisture or acid on top of Shorts terminals. Remove.
cells.
Plugged vent cap. Buckles cell jars. Make vent hole.
Cracked vent cap. Acid spills out. New cap.
Cracked cell jar. Electrolyte runs out. New jar.
DRY CELL BATTERY
DEFECT TROUBLE CAUSED REMEDY Broken wires. No current. New wires.
Loose terminals. Misfiring. Tighten.
Weak cell (7 amperes or Misfiring. New cells.
less).
Cells in contact. Short circuit. Separate and insulate.
Water in battery box. Short circuit. Dry out.
TIMER
DEFECT TROUBLE CAUSED REMEDY Contact segments worn or Misfiring. Grind down pitted. smooth.
Platinum points pitted. Misfiring. Smooth with oil stone.
Dirty oil or metal dust in Misfiring. Clean out.
interior.
Worn bearing. Misfiring. Replace.
Loose terminals. Misfiring. Tighten.
Worn revolving contact Misfiring. Replace.
brush.
Out of time. Irregular spark. Reset.
INDUCTION COIL
DEFECT TROUBLE CAUSED REMEDY Loose terminals. Misfiring. Tighten.
Broken connections. No spark. Make new joints.
Vibrators out of adjustment. Misfiring. Readjust.
Vibrator points pitted. Misfiring. Clean.
Defective condenser } rare. No spark. Send to maker Defective winding } for repairs.
Poor contact at switch. Misfiring. Tighten.
Broken internal wiring. No spark. Replace.
Poor coil unit. One cylinder affected. Replace.
WIRING
DEFECT TROUBLE CAUSED REMEDY Loose terminals anywhere. Misfiring. Tighten.
Broken plug wire. One cylinder will not Replace.
fire.
Broken timer wire. One coil will not buzz. Replace.
Broken main battery wire. } No spark. Replace.
Broken battery ground wire.} Broken magneto ground wire. Engine will not stop. Replace.
Chafed insulation anywhere.} Misfiring. Insulate.