Husqvarna ST131 [7/31] Controls features

Snow Engine Manual 4rev. 01/04/16

CONTROLS

1. Choke Control Knob

The Choke Control Knob opens and closes the choke valve in the carburetor. The “START” position enriches the fuel mixture which

allows easier starting a cold engine. The “RUN” position provides the correct fuel mixture once engine warms up. Never try to shut the

engine down using the Choke Control Knob.

2. Idle-Down Control Ring (if equipped) (not shown)

The Idle-Down Control Ring sets engine speed from high-speed to low-speed. Rotate the ring clockwise, “RUN” position for high-

speed. This control MUST be set in the “RUN” position for starting a cold engine. By rotating the ring counterclockwise, “IDLE”

The Fuel Control Knob opens and closes the passage between the fuel tank and carburetor. The Fuel Control Knob must be in the

“ON” position for the engine to run. When the engine is not in use, be sure to turn the Fuel Control Knob to the “OFF” position.

5. Safety Key Switch

The Safety Key Switch enables the engine electrical system and must be installed to start the engine. On some models this key switch

is incorporated with the RUN/STOP switch, #3.

6. Primer Bulb

The Primer Bulb system is designed to enrichen the fuel mixture for starting a cold engine. DO NOT over prime the fuel system.

To properly use the Primer Bulb system, depress Primer Bulb 3 times maximum when starting a cold engine. Do not use Primer

Bulb system when attempting to start a warm engine.

7. Oversized Recoil Handle

8. Oversized Gas Cap

Allows for easy opening and closing for more efcient refueling.

9. Electric Start (if equipped)

Used to start the engine with 120VAC extension cord.

Always use correct size extension cord to prevent

electric starter damage.

10. High Oil Fill Tube (if equipped)

Allows convenient location for adding oil during the life

of the engine. Check oil level with lower oil ll plug (10A)

per owner’s manual instructions.

5

6

7

3

1

Optional combined Engine Run/Stop

and Safety Key Switch (3 & 5)