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8. TROUBLESHOOTING
The following three conditions must be fulfilled for satisfactory engine start.
(1) The cylinder filled with a proper fuel-air mixture.
(2) Good compression in the cylinder.
(3) Good spark, properly timed, to ignite the mixture.
The engine cannot be started unless these three conditions are met.
There are also other factors which make engine start difficult, e.g., a heavy load on the engine
when it is about to start at low speed, and a high back pressure due to a long exhaust pipe.
The most common causes of engine troubles are given below:
8-1 NO ENGINE OPERATION
Phenomenon Possible causes Remedy
1. Electric starter
does not
operate.
1) Poor connection of key switch wiring Check, repair or replace
2) Wiring discontinuity between key switch and starter motor Replace
3) Wiring discontinuity between battery and starter motor Replace
4) Improper battery (low capacity) or discharged battery Charge or replace battery
5) Poor connection of battery terminal Check, clean or replace
6) Starter magnetic switch faulty Check, clean, repair or replace
7) Starter motor faulty Repair or replace
8) Crankshaft seizure Check, repair or replace
9) Seizure between piston and cylinder Check, repair or replace
2. Electric starter
operates, but
engine does
not start.
1) No fuel Refill
2) Poor connection or discontinuity of ignition system wirings Check, repair or replace
3) Electric starter faulty Repair or replace
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