Use and Care Manual

MAINTENANCE CS-7310P
50 X7503340002
© 11/21 ECHO Incorporated
Never use a metal tool to scrape carbon from the exhaust port. Do
not scratch the cylinder or piston when cleaning the exhaust port. Do
not allow carbon particles to enter the cylinder.
4. Use a wood or plastic scraping tool to clean deposits from cylinder
exhaust port.
5. Install muffler. Tighten muffler mounting bolts (or nuts) to 8-11 N•m
(70-95 lbf•in).
6. Install engine cover and attach spark plug lead.
7. Replace air cleaner cover.
8. Start engine, and allow unit to warm up at idle for several minutes.
9. Stop engine, and re-tighten mounting bolts (or nuts) to 8-11 N•m
(70-95 lbf•in).
10. Install guide bar and chain. Adjust chain tension.
11. Start engine and check for exhaust leaks between muffler and cylinder
head. Stop engine if leak is found and correct problem before operating
chainsaw.
Carburetor Adjustment
Every unit is run at the factory and the carburetor is set in compliance with
Emission Regulations. In addition, the carburetor is equipped with “H” (High
Speed) and “L” (Low Speed) needle adjustment limiters that prevent
settings outside acceptable limits.
Engine Break-In
New engines must be operated a minimum duration of two tanks of fuel
break-in before carburetor adjustments 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 and
durability performance up to 1,100 feet above sea level (ASL) (96.0 kPa). To
maintain proper engine operation above 1,100 feet ASL the carburetor
might
need to be adjusted by an authorized service dealer.