Specifications

31
Medium Frame Vertical Shaft Engines
To adjust high speed on an up/down control (diag.
41) bend the adjustment tab. Low speed is adjusted
by a screw at the bottom of the control bracket. Both
the governor override system and the up/down speed
control have a governed idle. On these systems it is
important to also adjust the throttle crack screw. To
adjust the throttle crack screw use your finger to hold
the throttle shutter tight against the throttle crack screw
and adjust the engine speed to approximately 600
R.P.M. less than the recommended low speed.
The idle speed is adjusted by turning the idle speed
screw clockwise to increase engine R.P.M. and
counterclockwise to decrease R.P.M. Use tool part
#670326 to adjust the high speed engine R.P.M. Place
the slotted end of the tool onto the adjustment tab and
bend the tab to the left (toward the spark plug end) to
increase engine R.P.M. (diag. 42).
NOTE
Be sure that the throttle cable has full travel from wide
open throttle to full choke. Hard Starting could result
if the cable is not properly adjusted to allow for full
choke.
Engine Speed and Mixture Adjustments
IDLE MIXTURE
SCREW
THROTTLE CRACK
SCREW
MAIN MIXTURE
SCREW
41
HIGH SPEED ADJUSTMENT TAB
LOW SPEED
ADJUSTMENT
SCREW
BEND TO INCREASE SPEED
BEND TO DECREASE SPEED
CHOKE HOOKUP
TOOL #670326
ALIGNMENT
HOLE
HIGH SPEED
ADJUSTMENT
TAB
THROTTLE
LINK HOOKUP
GOVERNED
IDLE SPEED
SCREW
CHOKE LEVER
AIR GAP
(.040 - .070")
(1.0 - 1.8 mm)
BEND TAB TO
ADJUST
TVXL220, OHV 11-18, OV358EA, OV490EA
STYLE SPEED CONTROL
42
IDLE SPEED
CRACK SCREW
IDLE MIXTURE
SCREW
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