Specifications

22
BEND TO INCREASE SPEED
BEND TO DECREASE SPEED
To adjust high speed on an up/down control (diag.35)
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.
After setting the engine speeds recheck the fuel
mixtures and double check the engine speeds.
NOTE: Not all engines have fully adjustable
carburetors.
It may be necessary to preset the carburetor mixture
screws.
Tecumseh Carburetors
Engine Model Main Pre-set Idle Pre-set
All models with
float-type carburetors 1-1/2 turn 1 turn
All codels with
diaphragm-type
carburetors 1 turn 1 turn
IDLE MIXTURE
SCREW
THROTTLE CRACK
SCREW
MAIN MIXTURE
SCREW
Engine Speed and Mixture Adjustments - continued
2.5-17.5 HP Vertical Shaft Engines
35
HIGH SPEED ADJUSTMENT TAB
LOW SPEED
ADJUSTMENT
SCREW
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
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. 36).
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.
TVXL220, OHV 11-17 STYLE SPEED CONTROL
36
IDLE SPEED
CRACK
SCREW
IDLE MIXTURE
SCREW