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This section describes repair, focusing on sections that may require frequent repair. Refer to the previous
section (TROUBLESHOOTING GUIDE) as the context for the following descriptions.
1. Precautions on Maintenance, Inspection and Repair
• Never place fuel near a source of fire because the fuel is inflammable.
• When reassembling this tool after disassembly, use new gaskets.
• Before overhauling this tool, transfer fuel and engine oil from this tool to separate containers. Before
disassembling this tool, wait until the engine is sufficiently cooled down.
• When repairing, starting or operating this tool, be careful not to touch any hot parts (such as the muffler,
high-voltage cable or spark plug) that could cause a burn injury or electric shock.
• Before operating this tool with its cutter blade, make sure that no other person is around you.
• When repairing this tool in a room or other location with poor ventilation, be sure to ventilate the place.
• After repair, check whether the throttle lever returns to the idling position and the engine stops when you
set the stop switch to the stopping position.
2. Inspection Criteria for Each Section and Consumable Parts
Idling speed
Max. no-load revolution (with cutter
blade mounted)
Clutch engaging
Acceleration
Valve clearance (in cold state)
Gap between magneto rotor and ignition
coil
Spark plug
Gap between spark plug electrodes
REPAIR GUIDE
Item
min
min
min
–
mm
mm
–
mm
-1
-1
-1
Acceleration must be smooth.
Exhaust: 0.1
-8-
CG 25EUS
2,500 to 3,500
9,500 to 11,500
3,900 to 4,900
Intake: 0.1
0.3 to 0.4
NGK CMR-5H
0.6 to 0.7
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