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G2500
G
B
GB-15
7. Muffler
If you do not attach the muffler correctly, after en-
gine starts, the muffler will be loosen and the
hightemperature exhaust gas spout. After clean-
ing the muffler, pay attention to fit up the muffler
according to the explanation as follows.
1. Muffler body, muffler cover and baffle will be combined
correctly.
2. Be sure the gasket is not broken. If it is broken, change to
the new one.
3. Before tightening the screw, rub the gross on it.
4. After making a test run, re-tighten the screw (TORQUE:
6.9-7.8 N.m./70-80 kg-cm)
Right after stopping the engine, do not touch the
muffler with one's bare hands. It will cause to burn
your hands.
If carbon clogs between the muffler, it will cause the poor-out-
put and the trouble in starting. After each 100 hours, check
and clean inside the muffler.
G
B
Place the file on the cutter and push straight forward.
Keep the file position as illustrated.
After each cutter has been filed, check the depth gauge
and file it to the proper level as illustrated.
8. Maintenance of Saw Chain and Guide Bar
■ Saw Chain
It is very important for smooth and safe op-
eration to always keep the cutters sharp.
The cutters need to be sharpened when:
• Sawdust becomes powder-like.
•You need extra force to saw in.
• The cut path does not go straight.
•Vibration increases.
• Fuel consumption increases.
Cutter setting standards:
Be sure to wear safety gloves.
Before filing:
• Make sure the saw chain is held securely.
•Make sure the engine is stopped.
• Use a round file of proper size for the chain.
Chain type: 91VG / 25AP
File size: 5/32 in (4.0 mm)
6. Way of the cooling air
• The engine metal parts can burn your skin. Never
touch the cylinder, muffler or ignition plug etc.
during operation or right after stopping the en-
gine.
• Before starting the engine, check around the
muffler and take off sawdust. If you do not, it will
cause the overheating and a fire. For prevent-
ing the trouble, please keep clean around the
muffler.
This engine is air-cooled. Dust clogging between the inlet port
of the cooling air and cylinder fins will cause overheating of
the engine. Periodically check and clean the cylinder fins after
removing the air cleaner and the cylinder cover.
Important: When installing the cylinder cover, make sure that switch wires
and grommets are positioned correctly in place.
inlet port of the cooling air
Appropriate gauge checker
Make the shoulder round
Depth gauge standard
91VG .025
″″
″″
″ (0.64 mm)