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Model: 251

MANUFACTURED BY:
OLYMPYK
REGGIO EMILIA, ITALY
SERIES OR ASSEMBLY NUMBER:
SERIAL NUMBER PREFIX:
YEAR INTRODUCED:
1977
YEAR DISCONTINUED:
ENGINE DISPLACEMENT:
49cc (3.0 cu. in.)
NUMBER OF CYLINDERS:
1
CYLINDER BORE:
44mm (1.73 in.)
PISTON STROKE:
32mm (1.26 in.)
PISTON RING THICKNESS:
CYLINDER TYPE:
Aluminum with chrome impregnated bore
INTAKE METHOD:
Piston ported
MANUFACTURER ADVERTISED H.P.:
6 SAE
WEIGHT:
6.5kg with 40cm bar & chain
14.3 lbs. with 16 in. bar & chain
OPERATOR CONFIGURATION:
One Man operation
HANDLEBAR SYSTEM:
Rigid
CHAIN BRAKE:
none
CLUTCH:
Centrifugal, engages @ 3000 RPM
DRIVE TYPE:
Direct
CONSTRUCTION:
Die cast magnesium
MAGNETO TYPE:
Selettra points type
CARBURETOR:
Tillotson HS-128B
MAJOR REPAIR KIT:
RK-23HS
MINOR REPAIR KIT:
DG-5HS/T
AIR FILTER SYSTEM:
Flocked wire screen
STARTER TYPE:
Automatic rewind
OIL PUMP:
Automatic, cam actuated piston pump, adjustable
MAXIMUM ENGINE RPM:
IDLE RPM:
IGNITION TIMING:
2.2mm before TDC
BREAKER POINT SETTING:
0.45mm (0.017 in.)
FLYWHEEL/COIL AIR GAP:
SPARK PLUG TYPE:
Bosch WS7F, Champion CJ7Y
SPARK PLUG GAP:
0.51mm (0.020 in.)
CRANKSHAFT MAIN BEARINGS:
Ball
FUEL TANK CAPACITY:
700ml
FUEL OIL RATIO:
40:1
RECOMMENDED FUEL OCTANE:
Regular
MIX OIL SPECIFICATION:
Two-stroke chain saw mix oil
CHAIN PITCH:
3/8 in.
CHAIN TYPE:
Oregon
BAR MOUNT PATTERN:
18 link
SHORTEST GUIDE BAR SUPPLIED:
16 in. (40cm)
LONGEST GUIDE BAR SUPPLIED:
18 in. (45cm)
COLOUR SCHEME:
Orange with Black handles and top cover
Also offered with 14 in. (35 cm) bow bar
PAINT CODES:
ILLUSTRATED PARTS LIST:
SERVICE MANUAL:

COMMENTS:
CSA Mar.77



 

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