CAUTION:
Avoid contacting hot exhaust pipe when you are ad-
justing carburetor.
Final Adjustment:
A. Turn main needle valve in until engine misses {lean mixture). Then turn it
out past smooth operating point until engine runs unevenly (rich mixture).
Now turn to the mid-point between rich and lean so the engine runs smoothly.
B. Hold throttle at idle position and set idle speed adjusting screw until fast
idle is obtained {1750 RPM).
C. Hold throttle in idle position and turn idle valve in (lean) and out (rich) until
engine idles smoothly.
D. Then reset idle speed adjusting screw so that engine idles at 1750 RPM.
Acceleration:
Engine should accelerate without hesitation or sputtering. If engine does not
accelerate properly, the carburetor should be re-adjusted to a slightly richer
mixture
(i.e.,
open main needle valve slightly).
Riding Lawn Mower Under Load:
Loss of power, tendency to
stall,
or excessive backfiring all indicate a lean
mixture. Open the "Main" needle valve in 1/8 turn graduations until
engine runs smoothly. Operating the engine on too lean a mixture causes
loss of power and high exhaust heat. If mixture is too
rich,
the engine will
sound as though flooded and dark smoke will appear in the exhaust fumes.
NOTE:
Erratic engine operation can also be caused by dirt or other foreign
material in the carburetor. Carburetion on small gasoline engines is
always critical of dirt. It is recommended that a filtering fuel
funnel always be used along with clean gasoline. Also check the
fil-
ter in the tank outlet fitting periodically.
CAUTION:
Do not change the engine governor settings or over
speed the engine.
ENGINE LUBRICATION
See ENGINE LUBRICATION on page 12 of this manual.
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