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Model: 550, 550W, 550SL

MANUFACTURED BY:
HOMELITE-TEXTRON
PORT CHESTER, NEW YORK, USA
SERIES OR ASSEMBLY NUMBER:
UT10458, UT10497, UT10498, UT10636
YEAR INTRODUCED:
1978
YEAR DISCONTINUED:
1982
ENGINE DISPLACEMENT:
5.0 cu. in. (81 ccm)
NUMBER OF CYLINDERS:
Homelite Two-Cycle single cylinder loop scavenged engine
CYLINDER BORE:
2.00 in. (51 mm)
PISTON STROKE:
1.625 in. (41.3 mm)
PISTON RING THICKNESS:
0.024 in. 2 rings used, pn 12911 thin ring
CYLINDER TYPE:
Aluminum with Chrome plated bore
INTAKE METHOD:
Piston ported
MANUFACTURER ADVERTISED H.P.:
not advertised
WEIGHT:
18 lbs. 6 oz. (8.43 kg) powerhead only
OPERATOR CONFIGURATION:
One Man operation
HANDLEBAR SYSTEM:
Anti-vibration
CHAIN BRAKE:
Optional, Manual
CLUTCH:
Centrifugal, 3 metal shoes
DRIVE TYPE:
Direct
CONSTRUCTION:
Die cast Magnesium, injection molded polymer
MAGNETO TYPE:
Flywheel Electronic
CARBURETOR:
Walbro SDC-69A
MAJOR REPAIR KIT:
K10-SDC
MINOR REPAIR KIT:
D10-SDC
AIR FILTER SYSTEM:
Nylon mesh cartridge
STARTER TYPE:
Homelite automatic rewind
OIL PUMP:
Automatic with manual override
MAXIMUM ENGINE RPM:
No load 11,000 to 12,500 with bar and chain installed
IDLE RPM:
IGNITION TIMING:
fixed
BREAKER POINT SETTING:
none
FLYWHEEL/COIL AIR GAP:
0.015 in. (0.38 mm)
SPARK PLUG TYPE:
Champion DJ6J or CJ-4
SPARK PLUG GAP:
0.025 in. (0.63 mm)
CRANKSHAFT MAIN BEARINGS:
Roller
FUEL TANK CAPACITY:
31 oz. (916 ml)
FUEL OIL RATIO:
32:1 with Homelite oil
RECOMMENDED FUEL OCTANE:
Regular
MIX OIL SPECIFICATION:
Homelite chain saw mix oil
CHAIN PITCH:
3/8 in.
CHAIN TYPE:
Homelite
BAR MOUNT PATTERN:
14 link
SHORTEST GUIDE BAR SUPPLIED:
20 in. (51 cm)
LONGEST GUIDE BAR SUPPLIED:
31 in. (78 cm)
COLOUR SCHEME:
Homelite Red with Black
PAINT CODES:
ILLUSTRATED PARTS LIST:
IPL no. 17151
SERVICE MANUAL:

COMMENTS:
Full wrap front handle optional



 

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