Tecumseh ECV100 - 120 Technician's Handbook page 34

GOVERNED
ADJUSTING RPM ON MEDIUM FRAME
IDLE SPEED SCREW
VERTICAL SPEED CONTROL
HIGH SPEED
GAP OF
ADJUSTMENT TAB
.040 - .070
This speed control is adjusted by aligning the slot in the
(1.016 - 1.778 mm)
speed control lever with the alignment hole on the mounting
bracket. Place a pin through the two holes, place the
equipment throttle control to the wide open position, hook
the bowden cable end in the control as shown, and tighten
the cable housing clamp. In this position, the gap of .040"
- .070" (1.016 - 1.778 mm) should exist at the gap location
HIGH SPEED
as illustrated. This will assure that the carburetor will go
PIN POSITION
into full choke when the control is placed in the start
position.
TOOL
670326
Þ
INCREASE
DECREASE
14
ADJUSTING GOVERNED/NON-GOVERNED
.040 - .070 (1.016 - 1.778 mm)
With the engine running at its lowest speed, set the
HIGH SPEED
GAP LOCATION
ADJUSTMENT TAB
governed idle at the designated RPM by adjusting the
governed idle screw or bending the idle tab. Next set the
BEND AREA
non-governed idle by pushing the bottom of the governor
CHOKE ADJUSTING
lever away from the control brackets so the throttle lever
TAB
contacts the idle speed crack screw (on the carburetor).
Hold the lever in this position and turn the crack screw to
600 RPM below the governed idle speed. This setting
CONTROL
LEVER
prevents the throttle plate from closing off when going from
high speed RPM to low speed RPM. If improperly adjusted,
HIGH SPEED
the engine could experience an over lean condition.
PIN POSITION
The idle speed is adjusted by turning the idle speed screw
DECREASE
clockwise to increase engine R.P.M. and counter-clockwise
to decrease R.P.M. Use tool part # 670326 to adjust the
INCREASE
GOVERNED
high speed engine R.P.M. Place the slotted end of the tool
IDLE ADJUSTING
TOOL
onto the adjustment tab and bend the tab to the left (toward
SCREW
670326
15
the spark plug end) to increase engine R.P.M. (diag. 14).
NOTE: Some engines use nylon bushings on the throttle
and choke linkage hook-up points to extend the life of the
linkage and to enhance the stability of the governor system.
Make sure they are in good condition and in place.
ADJUSTING RPM ON MEDIUM FRAME
VERTICAL
(up/down speed control)
To adjust the high speed RPM on Medium Frame Vertical
engines, move the control lever to the high speed pin
position (align high speed pin holes in the speed control
bracket). Place the slot on the straight end of tool (number
670326) onto the high speed adjustment tab as pictured.
Rotate the bent end of the tool counterclockwise to
increase RPM and clockwise to decrease RPM. (diag.
15).
30