Husqvarna TC 250 2010 Workshop Manual page 26

ENGINE
Trouble
Engine does not start or
has starting trouble
Engine stalls
easily
Engine is noisy
TROUBLESHOOTING
Cause
Insufficient compression
1. Piston seized
2. Connecting rod small or big end seized
3. Worn piston rings
4. Worn cylinder
5. Cylinder head loosely tightened
6. Head gasket leaking
7. Spark plug loose
8. Incorrect valve clearances
9. Weak or seized valve springs
10. Seized valves
Weak or no spark
1. Spark plug faulty
2. Fouled or wet spark plug
3. Spark plug electrode gap too wide
4. Ignition coil faulty
5. High-tension cables open circuit or shorted
6. Electronic control unit faulty
7. Right-hand switch faulty (TE - TXC)
Carburettor is receiving no fuel (TC)
1. Tank cap breather clogged
2. Fuel cock clogged
3. Fuel feed pipe clogged
4. Filter on carburettor fitting dirty
5. Floater valve or floaters faulty
6. Linkage is blocking floater valve
Carburettor floods (TC)
1. High fuel level in bowl
2. Floater valve or floaters worn or stuck
open
1. Fouled spark plug
2. Electronic control unit faulty
3. Carburettor jets clogged
4. Low idle
Noise seems to come from piston
1. Too much piston-to-cylinder clearance
2. Worn piston rings or piston grooves
3. Too much carbon build-up in
combustion chamber or on piston crown
4. Valve clearances too large
5. Weak or seized valve springs
6. Worn timing chain
7. Incorrect timing chain tension
Noise seems to come from crankshaft
1. Worn main bearings
2. Connecting rod big end has too much side clearance or end float Replace
3. Crankshaft gear damaged
4. Crankshaft locknut loose
C.2
Remedy
Replace
Replace
Replace
Replace
Tighten
Replace
Tighten
Adjust
Replace
Replace
Replace
Clean or dry
Adjust
Replace
Check
Replace
Replace
Clean
Clean
Clean
Clean
Replace
Release
Adjust
Replace or release
Clean
Replace
Clean
Adjust
Replace
Replace
Clean
Adjust
Replace
Replace
Adjust
Replace
Replace
Tighten
Part. N. 8000 H1489 (10-2009)