BOLENS 4100.

MANUFACTURED BY:
 TITAN (PROPULSION ENGINE CORP)
  SOUTH MILWAUKEE, WISCONSIN
SERIES OR ASSEMBLY NUMBER:
 4100
YEAR INTRODUCED:
 1957
YEAR DISCONTINUED:
 
ENGINE DISPLACEMENT:
 4.7 cu. in. (77cc)
NUMBER OF CYLINDERS:
 1
CYLINDER BORE:
 2.0 in. (50.8mm)
PISTON STROKE:
 1.50 in. (38mm)
CYLINDER TYPE:
 Aluminum with cast iron sleeve
INTAKE METHOD:
 Reed valves
MANUFACTURER ADVERTISED H.P.:
 
WEIGHT :
 20 lbs. (9 kg) powerhead only
OPERATOR CONFIGURATION:
 One Man operation
HANDLEBAR SYSTEM:
 Rigid
CHAIN BRAKE:
 none
CLUTCH:
 Fairbanks Morse Centrifugal
DRIVE TYPE:
 Direct
CONSTRUCTION:
 Sand cast magnesium
MAGNETO TYPE:
 Phelon
CARBURETOR:
 Tillotson HC-7A
MAJOR REPAIR KIT:
 
MINOR REPAIR KIT:
 
AIR FILTER SYSTEM:
 Skinner ribbon filter element
STARTER TYPE:
 Fairbanks Morse automatic rewind
OIL PUMP:
 Manual
OPERATING RPM:
 4,500
IGNITION TIMING:
 0.250 in (6.35 mm) before TDC
BREAKER POINT SETTING:
 0.020 in. (0.51mm)
FLYWHEEL/COIL AIR GAP:
 Position is fixed
SPARK PLUG TYPE:
 Champion J8J, Autolite A7X, AC M45
SPARK PLUG GAP:
 0.030 in. (0.76mm)
CRANKSHAFT MAIN BEARINGS:
 Ball
FUEL TANK CAPACITY:
 1 U.S. Quart (946ml)
FUEL OIL RATIO:
 1/2 pint to 1 gallon 32:1
RECOMMENDED FUEL OCTANE:
 72 to 83
MIX OIL SPECIFICATION:
 Two cycle mix oil
CHAIN PITCH:
 7/16 in.
CHAIN TYPE:
 Oregon
BAR MOUNT PATTERN:
 
SHORTEST GUIDE BAR SUPPLIED:
 16 in. (40cm)
LONGEST GUIDE BAR SUPPLIED:
 18 in. (45cm)