910500
– 4-Cycle Gas Power
Impact Wrench
Impact
Phone: (262) 637-9681
Email:
5.2022 Rev 1
Page
21
of
27
Spark Plug
Recommended spark plug
: CM5H (CMR5H (NGK)
Note
: Incorrect spark plug can cause engine damage.
For good performance, the spark plug must be properly gapped and free of deposits.
1. Loosen the hex bolt [1] with a hexagon wrench, then remove the top cover [2].
2. Disconnect the spark plug cap [3] and remove any dirt from around the spark plug area.
3. Remove the spark plug [4] with a 5/8-inch spark plug wrench.
4. Inspect the spark plug. Reduce it if damaged or badly fouled, if the sealing washer [5] is in poor
condition, or fi the electrode is worn.
5. Measure the spark plug electrode gap with a wire-type feeler gauge. Correct the gap. The gap should
be: 0.6-0.7 mm (0.024-.028 in).
6. Install the spark plug carefully, by hand to avoid cross-threading.
7. After the spark plug is seated, tighten with a 5/8-inch spark plug wrench to compress the sealing
washer.
When installing a new spark plug, tighten 1/8 -1/4 turn after spark plug seats to compress the washer.
Torque:
11.8 N-m (9 lbf-ft)
8. Attach the spark plug cap to the spark plug.
9. Install the top cover and tighten the hex bolt securely with a hexagon wrench.
Cooling Fins
Inspect and Clean
1. Loosen the hex bolt and then remove the top
cover.
2. Disconcert the spark plug cap.
3. Inspect the engine cooling fins [1] and clean
out debris if necessary.
4. Reconnect the spark plug cap.
5. Install the top cove and tighten the hex bolt
securely.
