Shindaiwa AH243S-LW, Operator'S Manual

Page: 32 / 164

30
Maintenance and care
Troubleshooting table
The engine does not start
Diagnosis Cause Solution
Does the engine crank?
NO
Œ
Faulty recoil starter.
Œ
Fluid in the crankcase.
Œ
Internal damage.
Œ
Consult your dealer
YES
Good compression?
NO
Œ
Loose spark plug.
Œ
Tighten and re-test.
Œ
Excess wear on cylinder, pis-
ton, rings.
Œ
Consult your dealer
YES
Does the tank contain fresh fuel of the
proper grade?
NO
Œ
Fuel incorrect, stale, or con-
taminated; mixture incorrect.
Œ
Refill with fresh, clean unleaded
gasoline with a pump octane of 89
or higher mixed with a 2-cycle air
cooled mixing oil that meets or ex-
ceeds ISO-L-EGD and/or JASO
FC, FD classified oils at 50:1 gas-
oline/oil ratio.
YES
Is fuel visible and moving in the return
line when priming?
NO
Œ
Check for clogged fuel filter
and/or vent.
Œ
Replace fuel filter or vent as re-
quired. restart.
Œ
Priming pump not functioning
properly.
Œ
Consult your dealer
YES
Is there spark at the spark plug wire ter-
minal?
NO
Œ
The ignition switch is in Stop
position.
Œ
Move to the Start position.
Œ
Shorted ignition ground.
Œ
Faulty ignition unit.
Œ
Consult your dealer
YES
Check the spark plug.
NO
Œ
If the plug is wet, excess fuel
may be in the cylinder.
Œ
Crank the engine with the plug re-
moved, reinstall the plug, and re-
start.
Œ
The plug is fouled or improper-
ly gapped.
Œ
Clean and regap the plug to 0.6 -
0.7 mm. Restart.
Œ
The plug is damaged internally
or of the wrong size.
Œ
Replace the plug with an NGK
BPMR8Y or equivalent resistor
type spark plug of the correct
range. Set spark plug electrode
gap to 0.6-0.7 mm.