Husqvarna K1270 Workshop Manual page 83

22.4. INSUFFICIENT OUTPUT OR UNSTABLE ROTATION
Symptom/Category
Compression is
good and there is no
flame out
Excessive heat
Other
22.5. OTHER ENGINE PROBLEMS
Symptom/Category
Even if the engine
revolution is de-
creased, the blade
does not stop
Even if the engine
revolution is
increased, the blade
does not rotate
Abnormal vibration
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 pulse
pipe insertion part, etc.
4. Air has entered through the insulator and
carburettor installation part
5. Air has entered through the oil seal, etc.
6. There is water in the fuel
7. The piston appears to have been burned
8. Carbon blockage in the muffler
1. The engine is running 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 built up in the combustion
chamber
6. The spark plug tip is red hot
1. The air filter is too dirty
2. Excessive load
Cause
1. The clutch spring is broken
2. The clutch is open due to rusting of the
clutch bolts
1. Drum bearing is stuck
1. Blade eccentricity
2. Abnormal vibrations.
Anti vibration element is broken
Troubleshooting
Action
Insert it securely
Replace
Insert it securely
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
Repair or replace the carburettor
Clean
Clean
Replace with good quality fuel
Clean
Champion RCJ 6Y/NGK BPMR 7A:
Adjust to 0.5 mm
Replace the air filter
Reduce the load
Action
Replace the engine's clutch
spring
Remove rust from clutch bolts,
apply grease and re-assemble
Replace
Fit a new blade. Make sure that
the right arbor bushing is used
Replace
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