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Toro 51903; 51904; 51906; 51907 - Specifications; Engine; Drive Shaft & Cutting Head; Cold Engine Torque Specifications

Toro 51903; 51904; 51906; 51907
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EN–14
Specifications
Engine
Engine Type Air-Cooled, 2-Cycle
Stroke 1.25 in (31.75 mm)
Displacement 31 cc (1.9 cu. in)
Bore 1.37 in (34.79 mm)
Clutch Type None
Operating RPM 7000 rpm
Ignition Type Electronic
CD Module Air Gap 0.10-0.15 in
(0.254-0.381 mm)
Piston Ring Width 0.046 in (1.16 mm)
Piston Ring End Gap# 0.085 in (2.159 mm)
Piston Ring Side Clear-
ance
0.005 in max.
(0.127 mm)
Average Compression 90 to 120 lbs.
(41-55 kg)
Spark Plug Champion RDJ7Y
Spark Plug Gap 0.020 in (0.5 mm)
Lubrication Fuel/Oil Mixture
Fuel/Oil Ratio 32:1
Carburetor Diaphragm, All-Posi-
tion
Starter Auto Rewind
Muffler Baffled with Guard
Throttle Manual, Spring Return
Fuel Tank Capacity 18 oz (530 ml)
Bearings Needle and Ball
Crankshaft Cantilevered
Connecting Rod Stamped Steel
Fuel Tank HD Polyethylene
Drive Shaft & Cutting Head
Drive Shaft Chrome Vanadium,
1/4”
Drive Shaft Housing Steel Tube
Operating Weight Approx. 10.5 lbs
(4.73 kg)
Throttle Control Finger-Tip Trigger
Shoulder Strap Optional
Line Spool Bump Line Releaser
Line Spool Diameter 3 in (76.2 mm)
Trimming Line Diame-
ter
0.080 in (2.03 mm)
Cutting Path Diameter 18 in (45.7 cm)
Cold Engine Torque
Specifications
Cylinder Bolts 120 inlb (13.5 Nm)
Muffler Bolts 80-90 inlb
(9-10.1 Nm)
Carburetor Mount Bolts 15 inlb (1.67 Nm)
Shroud Mounting Bolts 120 inlb (13.5 Nm)
Module Mounting
Screws
28 inlb (3.2 Nm)
Starter Housing
Screws
40 inlb (4.5 Nm)
Air Cleaner Cover
Screws
40 inlb (4.5 Nm)
Flywheel Nut 150 inlb (16.9 Nm)
Spark Plug 110-120 inlb
(12.3-13.5 Nm)
Reed Screw 15 inlb (1.67 Nm)

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