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Model: 3910 SERIES

MANUFACTURED BY:
BOLENS CHAIN SAWS
PORT WASHINGTON, WISCONSIN, U.S.A.
SERIES OR ASSEMBLY NUMBER:
SERIAL NUMBER PREFIX:
YEAR INTRODUCED:
1958
YEAR DISCONTINUED:
1961
ENGINE DISPLACEMENT:
4.7 cu. in. (77 cc)
NUMBER OF CYLINDERS:
1
CYLINDER BORE:
2.00 in. (50.8 mm)
PISTON STROKE:
1.50 in. (38.1 mm)
PISTON RING THICKNESS:
CYLINDER TYPE:
Aluminum with cast iron sleeve
INTAKE METHOD:
Reed valves
MANUFACTURER ADVERTISED H.P.:
4
WEIGHT:
21 lbs. (9.5 kg) powerhead only
OPERATOR CONFIGURATION:
One Man operation
HANDLEBAR SYSTEM:
Rigid
CHAIN BRAKE:
none
CLUTCH:
Centrifugal, Fairbanks Morse
DRIVE TYPE:
Direct
CONSTRUCTION:
Sand cast magnesium
MAGNETO TYPE:
Phelon
CARBURETOR:
Tillotson HL series
MAJOR REPAIR KIT:
nla
MINOR REPAIR KIT:
DG-1HL
AIR FILTER SYSTEM:
Skinner ribbon element
STARTER TYPE:
Fairbanks Morse automatic rewind
OIL PUMP:
Manual
MAXIMUM ENGINE RPM:
4,500
IDLE RPM:
IGNITION TIMING:
0.175 in. (4.4 mm) before TDC
BREAKER POINT SETTING:
0.020 in. (0.51 mm)
FLYWHEEL/COIL AIR GAP:
fixed
SPARK PLUG TYPE:
Champion J8J, Autolite A7X, AC M45
SPARK PLUG GAP:
0.030 in. (0.76 mm)
CRANKSHAFT MAIN BEARINGS:
Ball
FUEL TANK CAPACITY:
FUEL OIL RATIO:
1/2 pint to 1 gallon = 16:1
RECOMMENDED FUEL OCTANE:
Regular
MIX OIL SPECIFICATION:
Two-cycle mix oil
CHAIN PITCH:
7/16 in.
CHAIN TYPE:
Oregon 62C
BAR MOUNT PATTERN:
SHORTEST GUIDE BAR SUPPLIED:
16 in. (40 cm)
LONGEST GUIDE BAR SUPPLIED:
24 in. (61 cm)
COLOUR SCHEME:
Metallic Green and Yellow enamel
PAINT CODES:
ILLUSTRATED PARTS LIST:
SERVICE MANUAL:

COMMENTS:
used Power Products AH-47 engine


Colour Photographs coutesy Cliff Rosencrans collection


 

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