CLEANING (FIG. 9)
Clean the filter element in warm soapy water, rinse and allow to
dry thoroughly. Or clean in nonflammable solvent and allow to dry.
Dip the filter element in clean engine oil, then squeeze out all
excess oil. The engine will smoke when started if too much oil is
left in the element.
Wipe dirt from the air cleaner body and cover, using a moist rag.
Be careful to prevent dirt from entering the carburetor.
Reinstall the filter element and air cleaner cover securely.
SPARK PLUG (FIG. 10-11)
Recommended spark plug: CM5H (NGK), CMR5H (NGK)
The recommended spark plug has the correct heat range for normal
engine operating temperatures.
AN INCORRECT SPARK PLUG CAN CAUSE ENGINE DAMAGE.
For good performance, the spark plug must be properly gapped and free
Remove the top cover.
CAUTION: Do not operate the engine
when the top cover is removed. Do not
pull the recoil starter handle when the top
cover is removed. You may be injured
from the rotating parts or burned by the
Disconnect the spark plug cap and
remove any dirt from around the
spark plug area
Remove the spark plug with a 5/8-
inch spark plug wrench.
Inspect the spark plug. Replace it, if damaged or badly fouled, if the sealing washer is in poor
condition, or if the electrode is worn.
Measure the spark plug electrode gap with a wire type feeler gauge. Correct the gap, if necessary, by
carefully bending the side electrode. The gap should be: 0,60 – 0,70 mm.
Install the spark plug carefully, by hand, to avoid cross-threading.
After the spark plug is seated, tighten with a 5/8-inch spark plug wrench to compress the sealing
When installing a new spark plug, tighten ½ turn after the spark plug seats to compress the washer.
When reinstalling the original spark plug, tighten 1/8–1/4 turn after the spark plug seats to compress
NOTICE: A LOOSE SPARK PLUG CAN OVERHEAT AND DAMAGE THE ENGINE. OVERTIGHTENING THE
SPARK PLUG CAN DAMAGE THE THREADS IN THE CYLINDER HEAD
10. Attach the spark plug cap to the spark plug.
11. Install the top cover and tighten the 5mm hex bolt securely with a hexagonal wrench.