Exhaust Port Cleaning; Exhaust System - Echo PB-770 H/T Operator's Manual

MAINTENANCE
Cleaning Cylinder Fins
1. Disconnect spark plug lead from spark plug.
2. Remove air filter cover.
3. Remove engine cover
4. Clean cylinder fins (A) to allow cooling air to pass freely
5. Install engine cover
6. Install air filter cover.
7. Connect spark plug lead.

Exhaust System

Spark Arrestor Screen
Level 2.
Parts Required: Spark Arrestor Screen, Gasket
Carbon deposits in muffler will cause a drop in engine output and overheating. Spark arrestor screen must
be checked periodically.
1. Disconnect spark plug lead from spark plug
2. Remove spark arrestor cover (A), gasket (B) and spark
arrestor screen (C) from muffler. Replace screen if plugged
with carbon deposits
Note: When cleaning carbon deposits, be careful not to damage
the catalytic element inside muffler.
3. Install spark arrestor screen, gaskets, and cover.
4. Connect spark plug lead.

Exhaust Port Cleaning

Level 2.
Parts Required: As needed: Muffler Gasket
1. Remove spark plug lead from spark plug, and remove
engine cover.
2. Place piston at top dead center. Remove muffler (A) and
muffler gasket (B).
3. Use a wood or plastic scraping tool to clean deposits from
cylinder exhaust port.
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A
C
B
B
PB-770 H/T
A
A
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