Craftsman 143.991200 Specifications download pdf (Page 28)

Speed Controls And Linkage

Many different types of speed controls and linkage are used for O.E.M. applications. Linkage attachment

points are best recorded or marked prior to disassembly. This assures the correct placement during reassembly.

The solid link is always connected from the outermost hole in the governor lever to the throttle in the carburetor.

The governor spring is connected between the speed control lever and the governor lever. Vertical shaft

engines may use an adjustable intake pipe mounted speed control bracket located above the carburetor, or a

vertical or horizontal control mounted on the side of the engine. The ignition ground out terminal, idle R.P.M.

and high speed R.P.M. adjustment screws may be located on the speed control bracket.

The adjustable speed control bracket which is

mounted on the intake pipe must be aligned properly

when installing. To align the control bracket, use the

following steps.

1. Loosen the two screws on the top of the panel.

2. Move the control lever to full wide open throttle

position and install a wire or aligning pin through

the hole in the top of the panel, the hole in the

choke actuating lever, and the hole in the choke

(diag. 12).

3. With the components aligned, tighten the two

screws on the control panel.

The following pages show common linkage hookup

arrangements. Whenever the carburetor or the

governor linkage is removed or replaced, the engine

R.P.M.'s should also be checked. Use microfiche card

#30 or contact a local Tecumseh dealer for the correct

R.P.M. settings for the engine model and specification.

NOTE: RPM SETTINGS CAN ALSO BE FOUND ON

THE COMPUTERIZED PARTS LOOK UP SYSTEMS.

OHH REMOTE SPEED CONTROL

The engine and equipment control must be adjusted

to allow the engine control lever to touch the high

speed stop when the equipment control is set in the

"highspeed" or "fast" position. Loosen the bowden wire

clamp, place the equipment control to the "fast"

position, move the engine control lever to contact the

high speed stop, and hold the lever in this position

while tightening the bowden wire clamp.

HIGH SPEED STOP

OHH GOVERNED IDLE SPEED CONTROL

This control is adjusted by bending the tabs on the control bracket to achieve the correct idle speed and high

speed. When the engine is running, the governor controls both the idle and the high engine speed. In order for

the governor to respond properly to a crankshaft load at engine idle, the idle speed screw on the top of the

carburetor must be set 600 RPM lower than the governed idle speed. Use the following procedure to set the

engine speeds (diag. 14 & 16).

1. Check to find the correct engine speeds found on microfiche card # 30 or using the Computer Parts Look-

up System.

2. Start and allow the engine to run ( 3-5 minutes) before beginning adjustments. Place the control knob in

the lowest engine speed position. Use a Vibra-Tach or other tachometer to set the non-governed idle

speed (600 RPM lower than the governed idle speed) by pushing the bottom of the governor lever away

from the control bracket so the throttle lever contacts the idle speed screw and hold the lever in this

position. Turn the idle speed screw clockwise to increase or counterclockwise to decrease engine idle

speed.

3. Allow the governor to control the throttle. Use a Vibra-Tach or other tachometer and bend the tab as

shown to achieve the specified governed idle speed.

4. Slide the control knob to the high speed position and bend the tab as shown to achieve the specified

governed high engine speed.

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Craftsman 143.991200 Specifications Page 28

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