Husqvarna TC 250 2011, Workshop Manual, Page: 26 / 366

C.2
TROUBLESHOOTING
Ed. 07-2010
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 (TE - TXCi) Replace
Engine stalls 1. Fouled spark plug Clean
easily 2. Electronic control unit faulty Replace
3. Carburettor jets clogged 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
Noise seems to come from the clutch
1. Worn plates Replace
2. Too much clearance between clutch housing and friction plates Replace
Noise seems to come from gearbox
1. Worn gears Replace
2. Worn gear grooves Replace
Noise seems to come 1. Chain stretched (worn) or improperly adjusted Replace or adjust
from secondary drive 2. Worn transmission sprocket and rear chain sprocket Replace
chain