Troubleshooting; Engine Does Not Start - Husqvarna 525BX Workshop Manual

Troubleshooting

8.1 Engine does not start

Remove the spark plug from the cylinder, and holding the cylinder, pull the starter housing and check
whether any sparks appear between the spark plug electrodes.
Symptom/Category
There are no sparks at the spark plug
Spark plug
Ignition module
Switch
There are sparks at the spark plug
Compression is
good and fuel flows
Fuel flows, but
compression is poor
No fuel flows
8 Troubleshooting
Cause
1. The spark plug electrodes are wet
2. Carbon has built up on the spark plug
electrodes
3. The spark plug electrodes are smoking-
plug electrodes
4. Insulation is poor due to cracks, etc. on
the spark plug insulator
5. The gap between the spark plug electro-
des is excessively small or large
1. Poor coil insulation
2. The cable trunking has been damaged or
the cable is broken
3. Poor air gap between the flywheel and coil Adjust to 0.3 mm
4. Damage to the plug and connection coil
1. The switch is OFF and not return ON
automatically
2. The switch is faulty
3. The primary wire is earthed
1. Excessive fuel intake
2. Fuel is too rich
3. Overflow
4. The air cleaner is soiled
5. Poor quality fuel is being used
1. The spark plug is loose
2. Wear or damage to the cylinder, piston,
piston
3. Gas is leaking from around the cylinder
and crankcase
1. Wrong carburetor adjustment
2. Blockage inside the carburetor
3. Blockage in the fuel filter
4. Fuel hose damage or blockage
Action
Dry them
Remove the carbon or replace
with a new product
Replace with a clean prod
Replace with a new product
BPMR8Y: Adjust to 0.65 mm
Replace
Repair or replace
Replace
Replace
Replace
Repair
Discharge the excess gas
Adjust or replace the carbure-
tor
Adjust or replace the carbure-
tor
Clean in a gasoline mixture
and dry thoroughly
Change with proper quality fuel
Tighten
Replace
Replace gasket with new
product and re-assemble
Adjust
Clean
Clean or replace the fuel filter
Repair or replace
English -
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