Husqvarna 2011 SMS 125, Workshop Manual

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C.4
TROUBLESHOOTING
Ed. 05-2011
Trouble Cause Remedy
Gear shift pedal does not return to original
position
1. Weak or broken selector return spring Replace
2. Worn shifter forks Replace
Transmission jumps out of gear 1. Worn sliding gear dogs Replace
2. Worn gear grooves Replace
3. Worn dog slots in gears Replace
4. Worn selector shaft splines Replace
5. Worn shifter fork shafts Replace
6. Worn shifter forks Replace
Engine has low power
1. Dirty air filter Clean
2. Poor fuel quality Replace
3. Intake coupling loose Tighten
4. Spark plug electrode gap too wide Adjust
5. Insufficient compression Check for the cause
6. Carburettor main jet clogged or of the wrong size Clean or replace
7. Too much ignition advance
Adjust
8. Deposits on the exhaust valve Clean
9. Exhaust valve wrongly installed Adjust
The engine overheats 1. Dirty combustion chamber and/or piston crown
with carbon deposits
Clean
2. Insufficient oil in engine or wrong oil Top up or change
3. Obstructions blocking air flow on radiator Clean
4. Cylinder head gasket leaking Replace
5. The clutch slides Adjust
6. Too much ignition delay Adjust
Coolant drops around spark plug elec -
trodes
1. Cylinder head gasket leaking Replace
2. Porosities inside head dome Replace
Oil level increase inside crankcase due to the
presence of coolant
1. Water pump impeller shaft leaking Check