Hitachi CS 33EA Technical Data And Service Manual page 14

The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and the
exploded assembly diagram for Model CS 33EA and the <Bold> numbers to those in the Parts List and the
exploded assembly diagram for Model CS 33ET.
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
otherwise, you run the risk of electric shock.
• Carefully wipe off any fuel around the plug to avoid a
sudden breakout of fire.
(a) Remove the spark plug from the cylinder set.
Use a wire brush to clean off carbon accumulated on
the spark plug 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 crankcase according to the procedure below.
(1) With the spark plug removed from the cylinder set,
(2) Open the choke (with the stop switch in the stop
position),
(3) Open the throttle (with the throttle lever pulled), and
(4) Pull the starter handle several times.
(b) Insert the spark plug 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 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 spark plug coil assembly
(a) Remove the Tapping Screw D4.5 x 20 [140] <141>, and
then the Recoil Starter Ass'y [139] <140>.
(b) Loosen the Hex. Hole Bolt M4 x 18/WS [19] <19> so
that the Ignition Coil Comp. [12] <12> is temporarily
tightened.
(c) Adjust the gap between the circumference of the
Magneto Rotor Ass'y [29] <29> and the Ignition Coil
Comp. [12] <12> to be 0.3 to 0.4 mm.
(d) Under this condition, firmly tighten the Hex. Hole Bolt
M4 x 18/WS [19] <19>.
Repair procedures
the starter handle;
-11-
•
Spark plug
Gap between
electrodes
(0.6 to 0.7 mm)
• Checking for sparks
High voltage cord
Metallic portion of the engine
• Magneto Rotor Ass'y and Ignition Coil Comp
0.3 to 0.4 mm
Ignition Coil Comp. [12] <12>
Hex. Hole Bolt M4 x 18/WS [19] <19>
Magneto Rotor Ass'y [29] <29>
Remove carbon.
Spark plug cap
Spark plug
Ignited sparks
.