Echo PB-770 Manuel D'utilisation page 25

1. Spark arrester screen
3. Spark arrester cover
1. Silencer
Check spark plug
a: 0.6 - 0.7 mm
2. Gasket
2. Gasket
Maintenance and care
IMPORTANT
Carbon deposits in silencer will cause a drop in engine output
and overheating. Spark arrester screen must be checked peri-
odically.
1. Disconnect spark plug lead from spark plug.
2. Remove spark arrester cover, gasket, and spark arrester
screen from silencer. Replace screen if plugged with carbon
deposits.
3. Install spark arrester screen, gaskets, and cover.
4. Connect spark plug lead.
Silencer and Exhaust Port
Tools required: Torx L-Wrench T27, Wooden or plastic scrap-
er
Parts required: 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 (10 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).
23