3－5
Recommended types: BOSCH F7RTC NHSP BP7RES CHAMPION RN9YC
NOTICE
Spark plugs of the wrong size or incorrect heat range
can cause engine damage.
1. Disconnect the spark plug lead and remove any dirt
from around the spark plug area.
2. Remove the spark plug with a spark plug wrench.
3. Inspect the spark plug for excessively worn electrodes,
chips or cracks in the insulator, or excessive deposits.
Replace the spark plug if you have any doubts about
its condition.
4. Measure the electrode gap with a wire gap gauge. Adjust
the gap to 0.025 – 0.030” by carefully bending
the ground electrode.
5. Use a spark plug wrench to tighten the plug enough to compress the washer. For a used plug, tighten 1/8 to
1/4 of a turn after the spark plug seats. For a new plug, tighten 1/2 turn after the spark plug seats. 18 – 22 ft.
lbs.
NOTICE
A loose spark plug can become hot enough to damage the engine. Over tightening a spark
plug can damage the threads in the engine.
6. Install the spark plug lead on the plug.
3.5 Valve Clearance
Valve clearance inspection and adjustment must be done with the engine cold.
1. Remove the valve cover, and set the first cylinder
piston at top dead center of the compression
stroke (both valves will be fully closed).
2. Measure the clearance between the rocker
arm and the valve stem with a feeler gauge.
Intake: 0.040” to 0.060” (0.10~0.15 mm)
Exhaust: 0.060” to 0.075 (0.15~0.20 mm)
3. To adjust valve clearance, hold the rocker arm
pivot and loosen the pivot lock nut.
4. Turn the rocker arm pivot to obtain the
specified clearance.
5. Hold the rocker arm pivot and tighten the pivot
lock nut.
6. Recheck the clearance and readjust if necessary.
7. Install the cylinder head cover.
8. Repeat procedure for the other side.
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