-3-
This section describes repair, focusing on portions requiring frequent repair. See TROUBLESHOOTING
GUIDE in the previous section as the context for the following descriptions.
1. Precautions on maintenance, inspection and repair
• The fuel used readily ignites; therefore, never bring the product near a flame.
• Use new gaskets at reassembly.
• Prior to disassembly for repair, remove the fuel and chain oil into separate containers, and allow the engine
to cool down.
• During repair, startup or running, use adequate care for portions posing the risk of burn injury or electric
shock, such as hot areas including the muffler, high voltage cord, and spark plug.
• Before running the product with the guide 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.
2. Inspection criteria for each section and consumable parts
Model
Item
CS 51EAP CS 51EA
Idling revolutions 3,000 ± 200 min
-1
(rev./min.)
No-load maximum revolutions
(with guide bar and saw chain)
13,500 min
-1
(rev./min.)
Clutch engagement 3,900 to 4,600 min
-1
(rev./min.)
Accelerating performance Smooth acceleration
Gap between magneto rotor and
ignition coil ass’y
0.2 to 0.4 mm
Spark plug NGK BPM7A or NGK BPMR7A
Gap between spark plug electrodes 0.6 to 0.7 mm
Saw chain type OREGON 95VPX, 20BPX
Saw chain pitch x gauge 8.26 mm (0.325 in.) x 1.27 mm (0.05 in.)
No. of saw chain drive links 56, 64, 66, 72, 78
REPAIR GUIDE
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