inSTruCTion manuaL CHain Saw CS Cs 490 Echo Chain
Oregon 18720 sprocket to swap on the echo 4910 to make it into a 3/8 or 3/8 LP chain. For the LP chain you'll need an LP bar. Carefully spray air on the clutch drum sprocket to test your chainsaw oiler. If it's not working then further diagnosing is required. Chainsaw oiler not working? Try this easy trick to diagnose. ...