Husqvarna Snow Blower Cover Owner Manual - Page 10

Spark Plug Service

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Dirty or heavy exhaust smoke No spark or poor spark Spark plug fouled with carbon Spark plug becomes fouled too soon Spark plug electrode overheated or burnt 1. Too much engine oil in the engine 2. Worn piston rings or cylinder 3. Worn valve guides 4. Scored or scuffed cylinder wall 5. Worn valve stems 6. Defective stem seal 7. Worn oil ring side rails 1. Defective ignition coil 2. Defective spark plug 3. Open-circuit wiring connection 1. Incorrect gasoline 2. Dirty air cleaner element 3. Too cold spark plug 1. Worn piston rings 2. Worn piston or cylinder 3. Excessive clearance of valve stems in valve guides 4. Worn valve stem oil seal 1. Too hot spark plug 2. Overheated the engine 3. Loose spark plug 4. Too lean fuel mixture Adjust Replace Replace Replace Replace Replace Replace Replace Replace Check and repair Replace Replace Use hotter plug Replace Replace Replace Replace Use colder plug Tune up Tighten Check for air leak Spark Plug Service 3FDPNNFOEFETQBSLQMVHT5PSDI1MVH'35$ Cross References  t$IBNQJOHQMVHDSPTTSFGFSFODFJT3/:$ TPNFUBCMFTTIPX3/:$$  t/(,QMVHDSPTTSFGFSFODFJT#13&4  t#04$)QMVHDSPTTSFGFSFODFJT83%$  t/05*$& Using an incorrect spark plug may cause engine damage.  8IFOFOHJOFJTDPPM EJTDPOOFDUUIFTQBSLQMVHDBQBOESFNPWFBOZEFCSJTGSPNUIFTQBSLQMVHBSFBXJUIIJHIQSFTTVSFBJS 2. Remove the spark plug with a 13/16-inch spark plug wrench. 3. Inspect the spark plug. Replace it if the electrodes are worn or if the insulator is cracked or chipped. Spark plug gap should be set to 0.027 - 0.030 inches. 4. Install the spark plug carefully to avoid cross threading. Screw in spark plug by hand until it stops turning. 5. Tighten the spark plug with a 13/16-inch spark plug wrench. Tighten 1/4 turn after the spark plug seats. t/05*$& A loose spark plug can overheat and damage the engine. Over-tightening the spark plug can damage the threads in the cylinder head. 6. Attach the spark plug cap. Ensure spark plug cap snaps into place securely. Rev:010410 Copyright © 2010 Liquid Combustion Technology, LLC LCT Engine Service Manual: 208cc, 291cc & 414cc 9

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Rev:010410 Copyright © 2010 Liquid Combustion Technology, LLC
LCT Engine Service Manual: 208cc, 291cc & 414cc
9
Dirty or heavy exhaust smoke
1.
Too much engine oil in the engine
Adjust
2.
Worn piston rings or cylinder
Replace
3.
Worn valve guides
Replace
4.
Scored or scuffed cylinder wall
Replace
5.
Worn valve stems
Replace
6.
Defective stem seal
Replace
7.
Worn oil ring side rails
Replace
No spark or poor spark
1.
Defective ignition coil
Replace
2.
Defective spark plug
Replace
3.
Open-circuit wiring connection
Check and repair
Spark plug fouled with carbon
1.
Incorrect gasoline
Replace
2.
Dirty air cleaner element
Replace
3.
Too cold spark plug
Use hotter plug
Spark plug becomes fouled
too soon
1.
Worn piston rings
Replace
2.
Worn piston or cylinder
Replace
3.
Excessive clearance of valve stems in valve guides
Replace
4.
Worn valve stem oil seal
Replace
Spark plug electrode over-
heated or burnt
1.
Too hot spark plug
Use colder plug
2.
Overheated the engine
Tune up
3.
Loose spark plug
Tighten
4.
Too lean fuel mixture
Check for air leak
Spark Plug Service
Cross References
Using an incorrect spark plug may cause engine damage.
2. Remove the spark plug with a 13/16-inch spark plug wrench.
3. Inspect the spark plug. Replace it if the electrodes are worn or if the insulator is cracked or chipped. Spark plug gap should
be set to 0.027 - 0.030 inches.
4. Install the spark plug carefully to avoid cross threading. Screw in spark plug by hand until it stops turning.
5. Tighten the spark plug with a 13/16-inch spark plug wrench. Tighten 1/4 turn after the spark plug seats.
A loose spark plug can overheat and damage the engine. Over-tightening the spark plug can damage the threads in the
cylinder head.
6. Attach the spark plug cap. Ensure spark plug cap snaps into place securely.