Operator's Manual
Maintenance
GB–18
Changing Crankcase Oil
Change oil after the first 2 operating hours and after
every 25 hours thereafter. Since warm oil drains
better and carries more contaminants than cold, run
engine for several minutes or so before draining oil.
1. Stop engine and pull wire off spark plug
(Fig. 15).
2. Drain gasoline from fuel tank: refer to Draining
Gasoline.
3. Tip mower on its left side (Fig. 17).
4. Place a drain pan under mower.
5. Remove drain plug from underside of mower
(Fig. 17).
1973
1
Figure 17
1. Oil drain plug
6. Lower mower allowing oil to drain into pan.
7. After draining, clean drain plug and reinstall it.
8. Set mower upright.
9. Wipe up any spilled oil.
10. Fill engine with fresh oil: refer to Fill Crankcase
With Oil.
Spark Plug
Use a Champion RJ19LM spark plug or equivalent.
Correct air gap is 0.76 mm (0.030”). Remove plug
after every 25 operating hours and check its
condition.
1. Stop engine and pull wire off spark plug
(Fig. 15).
2. Clean around spark plug and remove plug from
cylinder head.
IMPORTANT: Replace a cracked, fouled, or
dirty spark plug. Do not sand blast, scrape, or
clean electrodes because engine damage could
result from grit entering cylinder.
3. Set air gap at 0.76 mm (0.030”) (Fig. 18). Install
correctly gapped spark plug and gasket seal.
Tighten plug firmly to 20 Nm (15 ft-lb).
.76 mm
986
(.030”)
Figure 18
4. Reconnect spark plug wire when maintenance is
completed.