Echo CS-490 User Manual

27
CS-490
GUIDE BAR
• Cleanbeforeusing.
- Clean the groove of the guide bar with a small
screwdriver.
- Clean oil holes with a wire.
• Reverseguidebarperiodically.
• Checksprocketandtheclutchandcleanthebar
mount area before installation of the bar.
Replace either or both if worn.
SPROCKET
• Adamagedsprocketwillcausepremature
damage or wear of saw chain.
- When the sprocket has worn out 0.5 mm or
more, replace it.
• Checksprocketwhenyouinstallnewchain.
Replace it if worn.
CYLINDER FINS
• Checkperiodically.
• Cloggednswillresultinpoorenginecooling.
• Removedirtanddustfrombetweennstolet
cooling air pass easily.
MUFFLER SPARK ARRESTOR
• Removeaircleanercoverandremovespark
plug lead.
• Removesparkarrestorscreencoverandscreen
from muffler body.
• Cleancarbondepositsfrommufercomponents.
• Replacescreenifitiscracked,orhasholes
burned through.
• Assemblecomponentsinreverseorder.
NOTICE
Carbon deposits in muffler will cause drop in
engine output. Spark arrestor screen must be
checked periodically.
AUTOMATIC OILER
• Thedischargevolumeoftheautomaticoileris
adjusted to 7 mL/min approximately at 7000
r/min, prior to shipment from factory.
- To increase the delivery volume, turn the
adjusting screw counterclockwise.
When the screw touches stopper and stops,
this position indicates maximum discharge
volume. (16.5 mL/min at 7000 r/min)
- Do not turn the adjusting screw beyond the
maximum or minimum limit of volume
adjustment.
Worn : 0.5 mm
Groove
Oil hole
Cylinder fins
Spark arrestor screen
Muffler
Screen cover
(Clutch)
Sprocket
DecreaseIncrease
Adjusting screw

Echo CS-490 Specifications

General

Engine Displacement	50.2 cc
Chain Pitch	0.325 inches
Chain Gauge	0.050 inches
Ignition System	Digital
Vibration Reduction System	Yes
Bar Length	18 inches
Weight	10.6 lbs (dry weight)
Fuel Tank Capacity	16.6 fl. oz.