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Model: 644

MANUFACTURED BY:
SOLO KLEINMOTOREN GmbH
STUTTGART, GERMANY
SERIES OR ASSEMBLY NUMBER:
YEAR INTRODUCED:
1987
YEAR DISCONTINUED:
ENGINE DISPLACEMENT:
44.3cc (2.7 cu. in.)
NUMBER OF CYLINDERS:
1
CYLINDER BORE:
42mm (1.65 in.)
PISTON STROKE:
32mm (1.26 in.)
PISTON RING THICKNESS:
CYLINDER TYPE:
Aluminum with Nikasil coating
INTAKE METHOD:
Piston ported
MANUFACTURER ADVERTISED H.P.:
2.6kW (3.53 DIN)
WEIGHT:
4.55kg (10.1 lbs.) powerhead only
OPERATOR CONFIGURATION:
One Man operation
HANDLEBAR SYSTEM:
Anti-vibration
CHAIN BRAKE:
Yes
CLUTCH:
Centrifugal
DRIVE TYPE:
Direct
CONSTRUCTION:
Die cast magnesium, injection molded plastic
MAGNETO TYPE:
Electronic
CARBURETOR:
Tillotson HS-52A or HS-68A
Walbro
MAJOR REPAIR KIT:
RK-23HS
MINOR REPAIR KIT:
DG-5HS/T
AIR FILTER SYSTEM:
Nylon mesh cart ridge
STARTER TYPE:
Automatic rewind
OIL PUMP:
Automatic
MAXIMUM ENGINE RPM:
IDLE RPM:
IGNITION TIMING:
fixed
BREAKER POINT SETTING:
none
FLYWHEEL/COIL AIR GAP:
0.2 to 0.3 mm (0.008 to 0.012 in.)
SPARK PLUG TYPE:
Bosch WSR6F, Champion RCJ6Y
SPARK PLUG GAP:
0.50 mm (0.020 in.)
CRANKSHAFT MAIN BEARINGS:
Ball
FUEL TANK CAPACITY:
660 ml (22.4 fl. oz.)
FUEL OIL RATIO:
40:1
RECOMMENDED FUEL OCTANE:
Regular grade
MIX OIL SPECIFICATION:
SOLO mix oil
CHAIN PITCH:
.325 in.
CHAIN TYPE:
BAR MOUNT PATTERN:
SHORTEST GUIDE BAR SUPPLIED:
33cm
LONGEST GUIDE BAR SUPPLIED:
50cm
COLOUR SCHEME:
SOLO Red with Black top cover
PAINT CODES:
ILLUSTRATED PARTS LIST:
SERVICE MANUAL:

COMMENTS:
Current professional model.
CSA 1991



 

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