Husqvarna SMR 449 2011 I.E., Workshop Manual

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C.2
TC 449 2011/2012 I.E.
TE 449 - 511 2011/2012 I.E.
TXC 449 - 511 2011/2012 I.E.
SMR 449 2011 I.E.
SMR 511 2011/2012 I.E.
TROUBLESHOOTING
Workshop Manual Ed. 03-2012
ENGINE
Trouble Cause Remedy
Engine does not start or Insufficient compression
has starting trouble 1. Piston seized Replace
2. Connecting rod small or big end seized Replace
3. Worn piston rings Replace
4. Worn cylinder Replace
5. Cylinder head loosely tightened Tighten
6. Head gasket leaking Replace
7. Spark plug loose Tighten
8. Incorrect valve clearances Adjust
9. Weak or seized valve springs Replace
10. Seized valves Replace
Weak or no spark
1. Spark plug faulty Replace
2. Fouled or wet spark plug Clean or dry
3. Spark plug electrode gap too wide Adjust
4. Ignition coil faulty Replace
5. High-tension cables open circuit or shorted Check
6. Electronic control unit faulty Replace
7. Right-hand switch faulty Replace
The throttle body is not receiving fuel
1. Faulty fuel pump relay Change
2. Faulty fuel pump Check / change
3. Clogged fuel inlet hose Clean
Engine stalls 1. Fouled spark plug Clean
easily 2. Electronic control unit faulty Replace
3. Dirty injector Clean
4. Low idle Adjust
Engine is noisy Noise seems to come from piston
1. Too much piston-to-cylinder clearance Replace
2. Worn piston rings or piston grooves Replace
3. Too much carbon build-up in
combustion chamber or on piston crown Clean
4. Valve clearances too large Adjust
5. Weak or seized valve springs Replace
6. Worn timing chain Replace
7. Incorrect timing chain tension Adjust
Noise seems to come from crankshaft
1. Worn main bearings Replace
2. Connecting rod big end has too much side clearance or end float Replace
3. Crankshaft gear damaged Replace
4. Crankshaft locknut loose Tighten