Controls & Features - McCulloch MC621 Manuel D'opération

Controls & Features
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"
position, will allow your engine to run at low-speed. DO NOT OPERATE EQUIPMENT IN THE IDLE POSITION. Note: the idle-down
control is intended to be either in "RUN" or "IDLE" positions only.
3. Engine RUN/STOP Rocker Switch (or optional Rotary Key Switch)
The Engine Rocker Switch (or optional Rotary Key Switch) enables and disables the ignition system. Turn the engine switch to the
RUN position to start the engine. Turn the Engine Rocker Switch to the STOP position to stop the engine.
4. Fuel Control Knob
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
The engine is started by pulling the Recoil Handle. Always grip firmly and have your body positioned properly when pulling.
When starting the engine:
· Slowly pull Recoil Handle until resistance is felt.
· Then pull firmly the full length of the rope to start engine.
· Never wrap thumb around Recoil Handle in the event of
engine kick-back.
START
8. Oversized Gas Cap
Allows for easy opening and closing for more efficient 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 fill plug (10A)
per owner's manual instructions.
11. Oil Drain
The oil drain can be located on either side and
on some models extend out below the recoil housing.
rev. 01/04/16
OFF
RUN
FUEL
ON
Optional combined Engine Run/Stop
and Safety Key Switch (3 & 5)
7
1
2
3
6
5
3X's
MAX
8
10
4
9
10 A 10 A
11
Snow Engine Manual 4