Greensmaster Flex 21 Page 3 – 9 Engine
Fuel Filter
Initially, clean fuel filter element and sediment bowl after
the first 20 hours of operation; thereafter, clean after ev-
ery 50 hours operation.
1. Close fuel shut–off valve and unscrew nut from the
shut–off valve body. Remove sediment bowl, gasket,
and filter element (Fig. 9).
2. Clean sediment bowl and filter element in clean gas-
oline.
3. Reinstall filter element, gasket, and sediment bowl.
Secure with nut. Wipe up any spilled gasoline. Open fuel
shut–off valve.
Figure 8
1. Fuel shut–off valve
2. Sediment bowl
3. Shut–off valve body
2
3
1
Figure 9
1. Shut–off valve body
2. Gasket
3. Nut
4. Filter element
5. Sediment bowl
1
4
2
5
3
Spark Plug
Use a NGK BPR 5ES spark plug or equivalent. Remove
plug after every 100 operating hours and check its
condition.
1. Make sure engine is OFF. Pull high tension lead off
the spark plug.
2. Clean around spark plug and remove plug from the
cylinder head.
NOTE: The condition of the spark plug can give an ac-
curate picture of the overall condition of the engine. Use
the chart on the following page as a guide to determine
possible problems with the engine.
3. Inspect the spark plug.
IMPORTANT: Replace a cracked, fouled, or dirty
spark plug. Do not sand blast, scrape, or clean elec-
trodes because engine damage could result from
grit entering cylinder.
4. Set air gap from 0.028 to 0.032 inch (0.7 to 0.8 mm).
Install correctly gapped spark plug into cylinder head
and torque to 17 ft–lb (23 Nm). Connect high tension
lead to spark plug.
Figure 10
.028 to .032 in
(.7 to .8 mm)
Engine
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