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Tecumseh HS40 - 50 - Page 38

Tecumseh HS40 - 50
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34
GOVERNOR OVERRIDE SYSTEM FOR
TVM170, 195 AND 220 ENGINES
This system will be found starting on 1985 production
models, and will not retrofit onto older engines. It is designed
to allow the governor to regulate the low and high speeds
of the engine. The high speed is adjusted at the top screw
of the override lever; to increase R.P.M. turn the screw out
(counterclockwise), to decrease R.P.M. turn the screw in
(clockwise). The low speed is adjusted at the bottom screw
of the override lever; to increase R.P.M. turn the screw in or
clockwise, to decrease R.P.M. turn the screw out or
counterclockwise (diag. 31).
GOVERNED / NON-GOVERNED IDLE
With the engine throttle set at its lowest speed, set the
governed idle at the designated RPM by bending the idle
RPM tab or adjusting a screw. Next set the non-governed
idle by pushing the bottom of the governor lever away from
the control brackets, so the throttle lever contacts the idle
speed screw. Hold the lever in this position and turn the
idle adjustment screw clockwise to increase or
counterclockwise to decrease engine idle speed. The
setting on the carburetor screw should be set 600 RPM
below the governed idle setting. This setting prevents the
throttle plate from closing when going from high speed RPM
to low speed RPM. If improperly adjusted, the engine could
experience an over lead condition.
TVM ENGINES WITH GOVERNOR OVERRIDE
HIGH SPEED
ADJUSTMENT SCREW
LOW SPEED ADJUSTMENT SCREW
MAIN MIXTURE
SCREW
31

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