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 0.020º (0.50 mm) (Fig. 17). Install correctly gapped spark plug and gasket seal. Tighten plug firmly to 14 ft±lb (19 Nm).
Draining Gasoline
1.Stop engine and wait for engine to cool. Pull wire off spark plug.
Note: Drain gasoline from a cold engine only.
2.Remove cap from fuel tank. Use a
Note: This is the only procedure recommended for draining fuel.
Changing Crankcase Oil and Filter
Change oil after the first 5 operating hours and then after every 50 hours or every season. Change oil while engine is warm. Replace the oil filter (Fig. 18) after every 100 operating hours or yearly, whichever occurs first.
Note: Change oil every 25 hours when operating under heavy load or in high temperatures.
1.Stop engine and wait for all moving parts to stop. Pull wire off spark plug.
2.Remove grass bag. Drain gasoline from fuel tank: refer to DRAINING GASOLINE section.
3.Remove dipstick from oil fill tube and place a drain pan next to left side of mower.
4.Tip mower on its left side, allowing oil to drain into drain pan (Fig. 18).
5.When oil is drained, return mower to upright position and add fresh oil to engine. Refer to OIL section in BEFORE STARTING chapter.
Adjusting Throttle
Throttle control adjustment may be required if engine does not start. Whenever a new throttle control cable is installed, throttle must be adjusted.
1.Stop engine and wait for all moving parts to stop. Pull wire off spark plug.
2.Loosen cable clamp screw until throttle cable slides (Fig. 19).
3.Move governor control lever, throttle cable and casing in direction of arrow as far as possible
(Fig. 19). Move throttle control to 
(FAST position). Tighten cable clamp screw to lock
adjustment in place.
Cleaning Cooling System
After every 100 operating hours or every season, clean dirt and chaff from cylinder, cylinder head fins and from around carburetor and linkage. Also remove debris from air intake slots on recoil housing. This will ensure proper cooling and best engine performance.
Adjusting Wheel Drive
(self-propelled model only)
If mower does not
1.Close door in mower housing and remove grass bag.
2.ADJUSTMENT (Fig. 20)ÐRotate control knob clockwise 1/2 turn if mower does not
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