Use and Care Manual
22
Exhaust Port Cleaning
Level 2.
Parts Required: As needed: Mufer Gasket
1. Remove spark plug lead.
2. Remove mufer cover screws and remove mufer cover.
3. Place piston at top dead center.
4. Remove mufer bolts (A), eyeplate (B), mufer (C), and mufer
gasket (D). Check parts for wear or damage, and replace if neces-
sary.
5. Use a wood or plastic scraping tool to clean deposits from cylinder
exhaust ports (E).
6. Install mufer gasket (D), mufer (C), eyeplate (B), and mufer
bolts (A). Tighten bolts to 60-70 kgf • cm (50-60 in • lbf).
7. Connect spark plug lead.
8. Start engine, and allow unit to warm up at idle for several minutes.
9. Stop engine, and re-tighten bolts to to 60-70 kgf • cm (50-60 in •
lbf).
10. Install mufer cover and tighten screws.
11. Start engine and check for exhaust leaks between mufer and cyl-
inder head. Stop engine if leak is found and correct problem before
operating chain saw.
A
B
C
D
E
CaRbuRetoR aDjustment
Engine Break-In
New engines must be operated a minimum duration
of two tanks of fuel break-in before carburetor ad-
justments can be made. During the break-in period
your engine performance will increase and exhaust
emissions will stabilize. Idle speed can be adjusted
as required.
High Altitude Operation
This engine has been factory adjusted to maintain
satisfactory starting, emission, and durability perfor-
mance up to 1,100 feet above sea level (ASL) (96.0
kPa). To maintain proper engine operation and emis-
sion compliance above 1,100 feet ASL the carbure-
tor may need to be adjusted by an authorized ECHO
service dealer.
IMPORTANT
If the engine is adjusted for operation above
1,100 feet ASL, the carburetor must be re-
adjusted when operating the engine below
1,100 feet ASL, otherwise severe engine dam-
age may result.