39
NOTE:
Good operating conditions are indicated
if plug has light coating of gray or tan deposit. A
dead white, blistered coating could indicate
overheating. A black (carbon) coating may
indicate an over-rich fuel mixture caused by a
clogged air cleaner or improper carburetor
adjustment.
4.
Reinstall the spark plug into the cylinder head.
Torque the spark plug to 18-22 ft. lbs. (24.4-29.8
N.m).
NOTE:
Do not overtighten plug. The gap may
change considerably due to the distortion of the
plug outer shell.
FIG. 19
SPARK PLUG:
Every 100 hours of operation,
remove the spark
plug (See FIG. 18), check condition, and reset
the gap (See FIG. 19) or replace with a new plug,
as necessary. Replace spark plugs after every
400 operating hours to assure proper engine
performance. Use a Champion
®
type RC12YC
(or equivalent), spark plug.
IMPORTANT!
Equipment to be operated in
Canada must use a resistor type spark plug in
compliance with Canadian Government
regulations.
1.
Before removing the spark plug, clean the
area around the base of the plug to keep dirt and
debris out of the engine.
2.
Remove the plug and check its condition.
Replace the plug if worn or reuse is questionable.
ENGINE MAINTENANCE
1. Oil Fill Cap
3. Spark Plug
2. Air Filter
FIG. 18
IMPORTANT:
A cracked, fouled, dirty or
otherwise malfunctioning spark plug must be
replaced. Do not sand blast, scrape, or clean
electrodes by using a wire brush because grit may
eventually release from the plug and fall into the
cylinder. The result is usually a damaged engine.
3.
Check the gap using a wire feeler gauge.
Adjust the gap to .040 in. (1.02mm) by carefully
bending the ground electrode. (See FIG. 19)
1774
3
2
1
1863-1
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