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Model: CS-3900

MANUFACTURED BY:
ECHO (KIORITZ CORPORATION)
YOKOSUKA, MORIOKA Japan
SERIES OR ASSEMBLY NUMBER:
SERIAL NUMBER PREFIX:
YEAR INTRODUCED:
1991
YEAR DISCONTINUED:
ENGINE DISPLACEMENT:
39.6 ccm (2.45 cu. in.)
NUMBER OF CYLINDERS:
Air cooled, two-stroke, single cylinder gasoline engine
CYLINDER BORE:
41 mm
PISTON STROKE:
30 mm
PISTON RING THICKNESS:
CYLINDER TYPE:
INTAKE METHOD:
MANUFACTURER ADVERTISED H.P.:
WEIGHT:
4.4 kg (9.5 lbs.) powerhead only
OPERATOR CONFIGURATION:
HANDLEBAR SYSTEM:
Anti-vibration
CHAIN BRAKE:
Inertia activated
CLUTCH:
Centrifugal
DRIVE TYPE:
Direct
CONSTRUCTION:
MAGNETO TYPE:
Electronic
CARBURETOR:
Walbro WT-118B series
MAJOR REPAIR KIT:
MINOR REPAIR KIT:
AIR FILTER SYSTEM:
STARTER TYPE:
Automatic rewind
OIL PUMP:
Automatic
MAXIMUM ENGINE RPM:
IDLE RPM:
IGNITION TIMING:
Fixed at 30 degrees before TDC
BREAKER POINT SETTING:
none
FLYWHEEL/COIL AIR GAP:
0.35 mm (0.014 in.)
SPARK PLUG TYPE:
Champion CJ7Y
SPARK PLUG GAP:
0.63 mm (0.025 in.)
CRANKSHAFT MAIN BEARINGS:
Ball
FUEL TANK CAPACITY:
13.5 fl. oz.
FUEL OIL RATIO:
50:1 with ECHO mix oil
RECOMMENDED FUEL OCTANE:
89 regular automotive.
ASPEN2 pre-mixed Alkylate fuel is
best at 93 octane, no ethanol, has very long shelf life
MIX OIL SPECIFICATION:
ECHO two cycle. ISO-L-EDG. Jaso M345/FD
ASPEN Synthetic mix oil is best
CHAIN PITCH:
.325 in. 0.050 gauge
CHAIN TYPE:
Carlton K1L or K1C
BAR MOUNT PATTERN:
03 link
SHORTEST GUIDE BAR SUPPLIED:
40 cm (16 in.)
LONGEST GUIDE BAR SUPPLIED:
45 cm (18 in.)
COLOUR SCHEME:
PAINT CODES:
ILLUSTRATED PARTS LIST:
SERVICE MANUAL:

COMMENTS:
CSA 1991



 

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