Echo PB-625 Operator's Manual page 26

Maintenance and care
1. Silencer
Check spark plug
a: 0.6 - 0.7 mm
2. Gasket
IMPORTANT
Carbon deposits in cylinder exhaust port and silencer will
cause a drop in engine output and overheating. Silencer ex-
haust port must be checked periodically. Be careful not to
scratch the cylinder or piston when cleaning the cylinder ex-
haust port.
1. Disconnect spark plug lead from spark plug.
2. Remove engine cover - 5 screws.
3. Remove silencer and gasket.
4. Clean cylinder exhaust port being careful not to scratch cyl-
inder or piston, using a wooden or plastic scraper.
5. Install gasket and silencer.
6. Install engine cover.
Tools required: T-Wrench, Feeler gauge
Parts required: Spark plug
IMPORTANT
Use only NGK BPMR8Y spark plug otherwise severe engine
damage may occur.
1. Check plug gap. Correct gap is 0.6 mm to 0.7 mm.
2. Inspect electrode for wear.
3. Inspect insulator for oil or other deposits.
4. Replace plug if needed and tighten to 15 N·m - 17 N·m (150
kgf·cm to 170 kgf·cm).
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