Zenoah AIR G26, Instruction Manual

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11
Troubleshooting Guide for Gasoline Engines
a) The engine does not start.
The crankshaft
does not rotate
Seizure, intrusion of a foreign substance
The fuel has not been fed to
the carburetor
The fuel has been fed to the
carburetor
The Stop switch has
been turned off
Wiring is disconnected
Disassemble and repair
Disassemble and clean
Clean
Loosened
spark plug
Abrasion or damage of
the cylinder, piston, or
piston ring
Tighten further
Replace
Readjust
Replace
Wet plug
Remove the spark
plug and dry it
The carburetor has
not been properly
adjusted
The fuel is not
suitable
Turn on
Repair
The spark plug does not spark The spark plug does spark
Clogging inside the
carburetor
Clogging of the fuel
piping
No compression
(normally 7 kg/cm
2
99.5 psi or more)
The crankshaft
rotates
The spark plug is defective
The ignition module is defective
Replace
Replace
The air gap is too large Adjust
The spark plug gap is too large Adjust
Compression adequate
b) The engine stops by itself
It suddenly stops
The crankshaft does not rotate
or is abnormally heavy
The crankshaft
rotates
Out of fuel
Not out of fuel
The carburetor has not beeen properly adjusted
See a)
See a)
Put back
Repair
Use a standard plug
Turn on
Use clean fuel
Replace
The fuel is not fed to the carburetor
Water is mixed in the fuel
Replace
Replace
Refuel
Readjust
It slows down and stops
The plug cap has come off
Wiring disconnection
Spark plug bridge
The Stop switch has
been turned off
Air suction from a carburetor joint or oil seal
Abrasion of the piston ring
Repair
Replace
The fuel is not suitable
Clean
Clogging of the muffler or exhaust port due to carbon
The spark plug heat range is not proper
See c)
Repair
Overheating
Repair The Stop switch is defective
Switch wiring is disconnected
c) Lower power output
d) The engine does not stop
Overheating
Generally speaking, there are very few things that will
keep today’s modern engines from starting. Use good
quality “fresh” fuel and make sure that good plugs are installed. Should the engine fail to start after these items
are verified, refer to the charts on the following page.