2. Parts
  3. Model 10301 - Serial 3900001 - 3999999

Silver Series Lawnmower

Product Information

  • Model #: 10301
  • Serial #: 3900001 - 3999999
  • Product Type: Walk Behind Mowers

  • Model #: 88598
    Paint, Touch Up
  • Model #: 89800
    Rear Bag Chute Kit
  • Model #: 89801
    21-Inch Rear Grass Catcher
  • Model #: 89814
    Grass Catcher
  • Model #: 89816
    Replacement Side Bag
  • Model #: 89844
    21'' Blade Kit
  • Model #: 89860
    Leaf Shredder
  • Model #: 89864
    Mulch Plate
  • Model #: 89875
    Fuel Conditioner
  • Model #: 92-9693
    Short Block

  • Model #
    10301
  • Serial #
    3900001 - 3999999
  • Product Name
    Silver Series Lawnmower
  • Product Brand
    Lawnboy
  • Product Type
    Walk Behind Mowers
  • Product Series
    21" Steel Deck
  • Chassis Type
    Steel Deck WPM
  • Swath
    21 inch
  • Discharge
    Mulcher
  • Engine/Motor Manufacturer
    Lawn-Boy
  • Engine/Motor Size
    4 hp
  • Engine/Motor Type
    2 Cycle
  • Engine Starter
    Recoil
  • Transmission Type
    Gear

  • Engine: Type
    Air cooled, 2 cycle
  • Engine: Bore
    2.3810 - 2.3800 " (60.477 -85.852 mm)
  • Engine: Stroke
    1.7520 - 1.7497" (44.501- 44.442mm)
  • Engine: Connecting rod length
    3.00" (76.2mm)
  • Engine: Wrist pin diameter
    .5000" (12.7mm)
  • Engine: Wrist pin offset
    .070" (1.78mm) toward major thrust side
  • Engine: Crankpin Diameter
    .742" (18.85mm)
  • Engine: Top and bottom bearings
    Dia. top .875" (22.3mm) bottom 1.125" (28.58mm)
  • Engine: Displacement
    7.78 cu in (127.51 cc)
  • Engine: Horsepower
    4.5 hp. (3.35 kws)
  • Engine: Compression ratio
    5.91:1 ( range of 5.151 - 6.668 :1)
  • Engine: Compression
    Approximately 90 - 115 psi (6.43 - 8.21 kg/cm2 )
  • Engine: Engine rotation
    Counter clockwise as viewed from the PTO
  • Engine: Carburetor
    Single - circuit, with fixed main jet, float type
  • Engine: Fuel required Fuel / Oil Ratio
    Unleaded regular (87 octane) premixed with 2 cycle oil; 32:1 ratio
  • Engine: Recommended oil
    Toro 2-cycle or premium ashless NMMA certified oil
  • Engine: Fuel Tank Capacity
    1.3 qts. (1.23 ltr.)
  • Engine: Ignition type
    Solid state CD pack, Magneto type
  • Engine: CD Pack air gap
    .010" (.25mm)
  • Engine: Spark timing
    2 degrees - 8 degrees BTDC (cranking) ; 22 - 28
  • Engine: Spark plug / air gap
    Champion RJ12C /.035" (.889 mm)
  • Engine: Starting system
    Rope rewind
  • Engine: Governor
    Air vane
  • Engine: Governed engine speed
    3050 +/- 100 RPM
  • Engine: Idle speed
    2200 - 2800 RPM
  • Engine: Air cleaner
    Oiled, foam type
  • Engine: Choke
    Primer bulb
  • Engine: Fuel Filter
    In-tank and in-carburetor
  • Engine: Piston
    Permanent mold, high silicon aluminum
  • Engine: Piston rings
    Cast iron, semi-keystone top ring square cut secon
  • Engine: Ring end gap
    Normal range: .006" - .016" (.152 - .506mm) Wear l
  • Engine: Reed valve air gap
    .004" (.101mm) max.
  • Engine Torque: Bolt, Blade
    45-60 ft. lbs (60 -81.6 N-m)
  • Engine Torque: Nut Flywheel
    375 - 425 in lbs (42-47N-m)
  • Engine Torque: Screw, Air vane
    5-7 in lbs (5-8 N-m)
  • Engine Torque: Screw, Brake plate assembly
    60-70 in lbs (6.7-7.8 N-m)
  • Engine Torque: Screw, Carburetor mounting
    45-55 in lbs (5.0-6.1N-m)
  • Engine Torque: Screw, CD ignition pack
    90-110 in lbs (10-12 N-m)
  • Engine Torque: Screw, Cylinder to crankcase
    105-115 in lbs (12-13 N-m)
  • Engine Torque: Screw, Engine mounting
    350-400 in lbs (39-45 N-m)
  • Engine Torque: Screw, Ground strap stop
    15-25 in lbs (1.7-2.8 N-m)
  • Engine Torque: Screw, Muffler cover
    150-190 in lbs (17-22 N-m)
  • Engine Torque: Screw, Muffler plate
    140-200 in lbs (16-22 N-m)
  • Engine Torque: Screw, Reed
    10-13 in lbs (1.1-1.5 N-m)
  • Engine Torque: Screw, Rod cap to rod#
    65-75 in lbs (7.3-8.4 N-m)
  • Engine Torque: Screw, Shroud
    20-25 in lbs (2.3-2.8 N-m)
  • Engine Torque: Screw, Shroud base
    60-70 in lbs (6.7-7.8 N-m)
  • Engine Torque: Spark Plug Torque
    150-200 in lbs (17-23 N-m)
  • Engine Torque: Rewind starter
    65-75 in lbs (7.3-8.4N-m)
  • Engine, Carburetor: Type
    Toro, float type, single circuit, with primer
  • Engine, Carburetor: Body material
    Minlon
  • Engine, Carburetor: Seat material
    Bronze
  • Engine, Carburetor: Needle
    Stainless Steel with viton tip
  • Engine, Carburetor: Inlet needle "pop off" pressure
    5 psi (.7 Kg/cm2)
  • Engine, Carburetor: Main jet
    67.5
  • Engine, Carburetor: High altitude main jet
    65
  • Engine, Carburetor: Float height
    15/32" to 17/32" ( 11.9-13.5mm) bowl flange (no ga
  • Drive System: Gearbox Lubricant
    3 oz. (92gm) #2 Lithium grease
  • Chassis: Height of Cut Range
    1-3.5"; 1/2" increments
  • Drive System: Ground Speed
    2.6 mph
  • Engine: Engine Oil Type
    Lawn-Boy Gen 2 / NMMA-TCW3
  • Engine: Engine Speed
    3050±100 RPM
  • Engine: Ignition Coil Air Gap
    .010" / .25mm
  • Engine: Mix Ratio
    32:1 (4.0 oz./gal.)
  • Engine: Spark Plug
    Champion RJ12C
  • Engine: Spark Plug Gap
    .035"/ .9mm