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• Checking for sparks
Metallic portion of the engine
• Magneto rotor and ignition coil
[Bold] numbers in the descriptions below correspond to item numbers in the Parts List and exploded
assembly diagram for the Model CS 33EDT; <Bold> numbers correspond to those in the Parts List and
exploded assembly diagram for the Model CS 33EDTP.
Always stop the engine prior to disassembly or when replacing the saw chain.
1. How to check for sparks generated by the spark plug
CAUTION:
• Be careful not to touch the metallic portion of the spark plug when pulling the starter handle;
otherwise, you run the risk of electric shock. Wear gloves to avoid electric shock.
• Carefully wipe off any fuel around the plug to avoid a
sudden breakout of fire.
(a) Remove Spark Plug BPMR7A [94]<94> from the
Cylinder [93]<93>.
Use a wire brush to clean off carbon accumulated on
the Spark Plug BPMR7A [94]<94> electrodes, as
needed. Adjust the gap between the electrodes if
necessary. Use a cloth to wipe off any fuel on the
electrodes. Remove the fuel left in the Crank Case
[77]<77> according to the procedure below.
(1) With Spark Plug BPMR7A [94]<94> removed from
the Cylinder [93]<93>,
(2) Open the Choke Lever [49]<49> (with the Stop
Switch [128]<128> in the stop position),
(3) Open the throttle (with the Throttle Lever
[131]<131> pulled), and
(4) Pull the starter handle several times.
(b) Insert Spark Plug BPMR7A [94]<94> into the spark
plug cap, and then place the electrodes in contact with
the metallic portion of the engine. Under these
conditions, set the Stop Switch [128]<128> to the
startup position and pull the starter handle.
(c) When all the above are normal, the spark plug electrodes make a snapping sound to generate sparks.
2. Adjusting the gap formed between the magneto
rotor and ignition coil
(a) Remove the Tapping Screw (W/Flange) D4 x 20
(Black) [169]<168>, and then remove the Recoil Starter
[168]<167>.
(b) Loosen the Hex. Socket Hd. Bolt (W/Washers) M4 x 18
[103]<103> so that the Ignition Coil [95]<95> is
temporarily tightened.
(c) Adjust the gap between the circumference of the
Magneto Rotor [86]<86> and the Ignition Coil [95]<95>
to 0.2 to 0.4 mm.
(d) Under this condition, firmly tighten the Hex. Socket Hd.
Bolt (W/Washers) M4 x 18 [103]<103>.
Repair procedures
• Spark plug
Remove carbon.
High voltage cord
Ignited sparks
Spark Plug
BPMR7A [94]<94>
Spark plug cap
Ignition Coil [95]<95>
0.2 to 0.4 mm
Hex. Socket Hd. Bolt
(W/Washers) M4 x 18 [103]<103>
Magneto
Rotor [86]<86>
Gap between
electrodes
(0.6 to 0.7 mm)