-7-
• Spark plug
• Checking for sparks
High voltage cord
Ignited sparks
Spark Plug Ass’y
BPMR7A
[73]
Plug cap
Metallic portion of the engine
[Bold]
numbers in the description below correspond to item numbers in the Parts List and exploded
assembly diagram for the Model CS 33EDP.
WARNING: Always stop the engine prior to disassembly or when replacing the saw chain.
1. Checking for sparks of the spark plug
CAUTION:
•
Be careful not to touch the metallic portion of Spark
Plug
Ass’y BPMR7A [73] when pulling the starter
handle; otherwise, you run the risk of electric shock.
Wear gloves to prevent electric shock.
•
Carefully wipe off any fuel around the plug to avoid a
sudden flash of fire.
(1) Remove Spark Plug Ass’y BPMR7A
[73]
from the Cylinder
[74]
. Use a wire brush to clean off carbon deposits on the
electrodes of Spark Plug Ass’y BPMR7A
[73]
, as needed.
Adjust the gap between the electrodes if necessary. Use a
cloth to wipe off any fuel on the electrodes. Remove fuel left
in the Crank Case
[96]
by following the procedure below.
(a) Remove the Spark Plug Ass’y BPMR7A
[73]
from the
Cylinder
[74]
.
(b) Open the Choke Lever
[153]
, and then set the Stop
Switch
[147]
to the stop position.
(c) Open the throttle (by pulling the Throttle Lever
[156]
).
(d) Pull the starter handle several times.
(2) Insert Spark Plug Ass’y BPMR7A
[73]
into the Spark Plug
Cap
[77]
, and then place the electrodes in contact with
the metallic portion of the engine. Under these conditions,
set the Stop Switch
[147]
to the startup position and pull
the starter handle.
(3) When all the above steps are completed normally, the electrodes of Spark Plug Ass’y BPMR7A
[73]
should make a snapping sound to generate sparks.
2. Adjustment of the carburetor
(1) Use the Idle Adjust Screw
[12]
to adjust the carburetor.
• Use this screw to adjust revolutions at idling. Turning the
screw clockwise increases engine revolutions; turning it
counterclockwise decreases engine revolutions.
(2) Standard setting of the carburetor
• 2,800 to 3,200 min
-1
(Confirm that the saw chain does not rotate.)
(3) Fine adjustment
• Idling adjustment
(a) Adjust the idling revolutions after the engine is fully
warmed up.
(Tip on warm-up: Let the engine idle for one minute with the engine in half-throttled status.)
(b) Use the Idle Adjust Screw
[12]
to set revolutions so that the Saw Chain
[132]
does not start
rotating while the engine runs stably.
(c) Set idling revolutions to 2,800 to 3,200 min
-1
by using the Idle Adjust Screw
[12]
.
(Adjust to approx. 3,000 min
-1
.)
Inspection and repair procedures
Gap between
electrodes
(0.6 to 0.7 mm)
Remove carbon here.
• Idle adjust screw
Idle Adjust Screw
[12]
Revolutions
decrease.
Revolutions
increase.
