Troubleshooting Guide for Gasoline Engines

a) The engine does not start.

The crankshaft

 

 

 

Seizure, intrusion of a foreign substance

 

 

 

Disassemble and repair

 

 

 

 

 

 

 

 

 

does not rotate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clogging inside the

 

 

 

 

 

 

Disassemble and clean

The crankshaft

 

 

 

The fuel has not been fed to

 

 

 

 

 

carburetor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rotates

 

 

 

the carburetor

 

 

 

 

 

 

 

 

 

 

 

Clogging of the fuel

 

 

 

 

 

 

Clean

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

piping

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The fuel has been fed to the

 

 

 

No compression

 

 

 

 

 

Loosened

 

 

Tighten further

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

carburetor

 

 

 

 

 

 

 

 

(normally 7 kg/cm2

 

 

 

 

spark plug

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

99.5 psi or more)

 

 

Abrasion or damage of

 

Replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the cylinder, piston, or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compression adequate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

piston ring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The spark plug does not spark

 

 

 

 

 

 

 

 

 

 

 

 

 

The spark plug does spark

 

 

 

 

 

 

 

 

 

The Stop switch has

 

Turn on

 

 

 

 

 

 

 

Wet plug

 

 

 

 

Remove the spark

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

plug and dry it

 

 

 

 

been turned off

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The carburetor has

 

 

 

 

 

 

 

Wiring is disconnected

 

 

 

 

 

 

 

Repair

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The spark plug is defective

 

 

 

 

 

Replace

 

 

 

 

 

 

 

not been properly

 

 

Readjust

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

adjusted

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The ignition module is defective

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The fuel is not

 

 

 

 

 

 

 

The air gap is too large

 

 

 

 

 

 

 

 

 

Adjust

 

 

 

 

 

 

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

suitable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The spark plug gap is too large

 

 

 

 

 

Adjust

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

b) The engine stops by itself

It suddenly stops

It slows down and stops

The crankshaft does not rotate

 

 

 

See a)

 

 

 

 

 

 

or is abnormally heavy

 

 

 

 

 

 

 

 

The crankshaft

 

 

 

 

 

 

The plug cap has come off

 

 

 

 

 

 

 

 

 

 

 

rotates

 

 

 

Wiring disconnection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Spark plug bridge

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Stop switch has

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

been turned off

 

 

 

 

 

 

 

 

Out of fuel

 

 

 

 

 

 

 

 

Refuel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Not out of fuel

 

 

 

 

 

 

 

The fuel is not fed to the carburetor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Water is mixed in the fuel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Put back

Repair

Use a standard plug Use clean fuel

Turn on

See a)

Replace

c)Lower power output

Overheating

The carburetor has not beeen properly adjusted Air suction from a carburetor joint or oil seal Abrasion of the piston ring

The fuel is not suitable

Clogging of the muffler or exhaust port due to carbon The spark plug heat range is not proper

Readjust

Repair

Replace

Replace

Clean

Replace

d) The engine does not stop

Overheating

 

 

 

 

See c)

 

 

 

 

The Stop switch is defective

 

 

 

Repair

 

 

 

Switch wiring is disconnected

 

 

Repair

 

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APC Zenoah instruction manual Engine does not start, Engine stops by itself, Lower power output, Engine does not stop

Zenoah specifications

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