OPERATING INSTRUCTIONS
Starting and Stopping
COLD STARTING PROCEDURE
The carburetor on this engine is equipped with a fuel primer and a
choke system. To start a “cold” engine properly, perform the following
procedure:
1. Pump the primer bulb until fuel can be seen flowing through the fuel
return line to the fuel tank. (Flowing fuel should be almost clear, not
foamy or full of bubbles.)
2. Turn the choke lever to the Close position.
3. With the stop switch “ON”, and the throttle trigger positioned at Fast-
idle position, pull the starter grip.
After the engine is started, turn the choke lever to the Open position.
Then squeeze and release the throttle trigger to allow it to return to the
idle position.
If the engine stops running before you turn the choke lever to the open
position:
Go ahead and open the choke, pull the starter grip with the throttle trig-
ger positioned at Fast-idle position.
HOT RESTART
To start the engine that is already warmed up (hot restart), or if the
ambient temperature exceeds 68°F(20°C):
1. Pump the primer bulb until fuel can be seen flowing through the fuel
return line to the fuel tank. (Flowing fuel should be almost clear, not
foamy or full of bubbles.)
2. Turn the choke lever to the open position, and set the stop switch to
the “ON” position.
3. Leave the throttle trigger in the idle position and pull the starter grip.
If the engine fails to start after you follow the above procedures, contact an authorized MARUYAMA dealer.
TO STOP THE ENGINE:
1. Release the throttle trigger.
2. Slide the stop switch to “STOP” position.
CARBURETOR ADJUSTMENT
The carburetor has been carefully adjusted at the factory and should not
require any further adjustment. Only the idling speed can be adjusted by
turning the idle speed adjustment screw (see sketch). The correct speed
for model BC3021H is 2700 - 3300 RPM, and for others are 2400 - 2800
RPM (or just below the clutch engagement speed ). Turning the adjustment
screw clockwise will increase the idle speed.
If further adjustment is necessary, please contact a local authorized
MARUYAMA dealer.
— 5 —
STOP(OFF)
Stop Switch
Fast-idle Position
Idle Position
Fast-idle Start Lock
START(ON)
Choke Lever
Starter Grip
Primer Bulb
Fuel Return Line
[Except a BC3021H]
[BC3021H]
Choke Lever
Starter Grip
Primer Bulb
Fuel Return Line
[BC3021H]
[Except a BC3021H]
Idle Speed Adjustment Screw
