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Model: 491s

MANUFACTURED BY:
SHINDAIWA, YAMABIKO CORP
YAMABIKO, MORIOKA, HIROSHIMA JAPAN
SERIES OR ASSEMBLY NUMBER:
YEAR INTRODUCED:
YEAR DISCONTINUED:
ENGINE DISPLACEMENT:
50.2 ccm
NUMBER OF CYLINDERS:
1
CYLINDER BORE:
PISTON STROKE:
PISTON RING THICKNESS:
CYLINDER TYPE:
Aluminum with Chrome plated bore
INTAKE METHOD:
MANUFACTURER ADVERTISED H.P.:
WEIGHT:
4.8 kg
OPERATOR CONFIGURATION:
One Man
HANDLEBAR SYSTEM:
Anti-vibration
CHAIN BRAKE:
Yes
CLUTCH:
Centrifugal
DRIVE TYPE:
Direct
CONSTRUCTION:
Die cast Magnesium, injection molded Polymer
MAGNETO TYPE:
Flywheel type CDI
CARBURETOR:
MAJOR REPAIR KIT:
MINOR REPAIR KIT:
AIR FILTER SYSTEM:
STARTER TYPE:
Automatic rewind
OIL PUMP:
Automatic, fully adjustable, tank capacity 280 ml
MAXIMUM ENGINE RPM:
11,000 to 12,500 free with bar and chain installed
IDLE RPM:
2,600 to 3,600
IGNITION TIMING:
Fixed
BREAKER POINT SETTING:
none
FLYWHEEL/COIL AIR GAP:
SPARK PLUG TYPE:
NGK BPMR8Y
SPARK PLUG GAP:
.06 to .07 mm
CRANKSHAFT MAIN BEARINGS:
Ball
FUEL TANK CAPACITY:
490 ml
FUEL OIL RATIO:
50:1
RECOMMENDED FUEL OCTANE:
Automotive 89, ASPEN2 pre mixed Alkylate fuel is better
MIX OIL SPECIFICATION:
Shindaiwa Red Armor or equivalent. ASPEN synthetic oil is better
CHAIN PITCH:
.325 in.
CHAIN TYPE:
Oregon 20BPX
BAR MOUNT PATTERN:
03 link
SHORTEST GUIDE BAR SUPPLIED:
40 cm (16 in.)
LONGEST GUIDE BAR SUPPLIED:
50 cm (20 in)
COLOUR SCHEME:
PAINT CODES:
ILLUSTRATED PARTS LIST:
SERVICE MANUAL:

COMMENTS:




 

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