Insufficient Output Or Unstable Rotation; The Amount Of The Wind Is Weak - Husqvarna 525BX Workshop Manual

Troubleshooting

8.4 Insufficient output or unstable rotation

Symptom/Category
Compression is
good and there is no
flame out
Excessive heat
Other

8.5 The amount of the wind is weak

Trouble
Good compression
but cannot reach the
requierd revolutions
at full throttle
65
- English
Cause
1. Air has entered through the fuel pipe joint,
etc.
2. Air has entered the fuel pipe due to a
crack or pin hole
3. Air has entered through the insulator and
carburetor installation part
4. Air has entered through the oil seal, etc.
5. There is water in the fuel
6. The piston appears to have been burned
7. Carbon blockage in the muffler
1. Fuel is lean
2. Blockage due to dirt in the air passage for
cooling
3. Blockage due to dirt on the cylinder fin,
etc.
4. Poor quality fuel is being used
5. Carbon has collected up in the combus-
tion chamber
6. The spark plug electrode is red hot
1. The air cleaner is soiled
2. Excessive load
Probable Cause
1. The air cleaner element is clogged
2. Carbon adheres to the spark arrester
3. Carburettor is damaged
Action
Insert it securely
Replace
Replace or tighten the gasket
Replace
Discharge and clean the inside
of the tank, then fill with good
quality fuel
Remove the burn with a fine
file, or replace
Clean
Adjust or replace the carbure-
tor
Clean
Clean
Replace with good proper fuel
Clean
Clean carefully, and BPMR8Y:
Adjust to 0.65 mm
Clean in a gasoline mixture
and dry thoroughly
Reduce the load
Countermeasure
Clean the element
Clean the spark arrestor
Maintenance or replace