-2-
This section describes necessary repair by focusing on portions requiring frequent repair. Refer to the
previous section (TROUBLESHOOTING GUIDE) in connection with the following content.
1. Precautions on Maintenance, Inspection and Repair
○The fuel used readily ignites; therefore, never bring the product near a flame or heat source.
○ Use new gaskets at reassembly.
○ Prior to disassembly for repair, pour the fuel and chain oil into separate containers for removal, and allow
the engine to cool down.
○ When performing repair, startup or actual operation, be particularly careful around portions posing the risk
of burn injury or electric shock, such as hot areas including the muffler, high voltage cord and spark plug.
○ Before operating the product with the chain bar and saw chain attached, make sure that there are no
other people nearby.
○ Ensure proper ventilation when performing repair in a small room or other poorly ventilated space.
○ After completing repair, always return the throttle lever to the idling position and set the stop switch to the
engine stop position.
2. Inspection Standards and Spark Plug Replacement
Item CS 33EB/CS 33EB (P)
Idling revolutions min
-1
(rpm) 2,900 to 3,300
No-load maximum revolutions
(with guide bar and saw chain)
min
-1
(rpm) 12,500
Clutch engagement min
-1
(rpm) 3,900 to 5,000
Accelerating performance ― Smooth acceleration
Gap between magneto rotor and ignition coil mm 0.3 to 0.4
Spark plug ― NGK BPMR6A or NGK BPM6A
Gap between spark plug electrodes mm 0.6 to 0.7
Height of carburetor metering lever ―
Position 1.5 mm lower than
carburetor body surface
Type of saw chain inch OREGON 91VG
Saw chain pitch x gauge ― 3/8 x 0.05
No. of saw chain drive links ― 45 (12”), 52 (14”), 57 (16”)
REPAIR AND MAINTENANCE GUIDE
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