Craftsman 143.991200 Specifications download pdf (Page 59)

SERVICE

To remove the ignition module or the flywheel from

the engine, see Chapter 9 under "Disassembly".

SPARK PLUG SERVICE

Spark plugs should be removed, cleaned, and

adjusted periodically.

Check the air gap with a spark plug gap gauge and

adjust accordingly. Set the spark plug gap at .030"

(.762 mm) (diag. 5).

Replace the plug if the points on the base of the plug

are pitted or burned, or if the porcelain is cracked

anywhere.

1. Carburetor setting is too rich or the air cleaner

is restricted.

2. Partially closed choke shutter.

3. Poor grade of gasoline.

4. Improper fuel.

5. Restricted exhaust system.

6. Incorrect spark plug.

7. Incorrect spark plug gap.

8. Oil level is too high, or the breather is restricted.

9. Faulty piston rings.

10. Weak ignition system.

Normal

Carbon Deposit

Worn

Oil Deposit

When reinstalling the plug make sure it is clean of all foreign material.

NOTE: DO NOT USE A SAND BLASTER TO CLEAN PLUGS, MICROSCOPIC PARTICLES LEFT IN THE

PLUG CAN SCORE THE ENGINE CYLINDER DURING OPERATION. USE A SOLVENT AND A WIRE BRUSH

TO CLEAN, AND USING EYE PROTECTION, BLOW OUT THOROUGHLY WITH COMPRESSED AIR.

Or replace the spark plug with the proper spark plug. Consult the proper parts breakdown for the spark plug to

be used in the engine being serviced.

Set the spark plug gap at .030" (.762 mm) using a spark plug gap gauge.

Install the spark plug in the engine and tighten it to 180 inch pounds (20.5 Nm) torque. If a torque wrench is not

available, screw the spark plug in as far as possible by hand, and use a spark plug wrench to turn the spark

plug 1/8 to 1/4 of a turn further if using the old spark plug, or 1/2 of a turn further if using a new spark plug.

CONDITIONS CAUSING FREQUENT SPARK PLUG FOULING

GAP GAUGE

(670256)

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Craftsman 143.991200 Specifications Page 59