The Kawasaki FJ100D is a 0.1 l (98 cc, 5.98 cu-in) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine with horizontal shaft manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.
The FJ100D engine has an OHV (overhead valve) design; cast iron cylinder liner; float type carburetor with fixed main jet; flywheel magneto transistor type ignition system; mechanical governor and recoil starter with an automatic compression release. The engine uses semi-wet type air cleaner.
Bore and stroke are 56.0 mm (2.2 in) and 40.0 mm (1.57 in), respectively. Compression ratio rating is 8.3:1. The Kawasaki FJ100D motor produced 3.0 PS (2.2 kW; 3.0 HP) at 3,600 rpm of maximum horsepower (SAE J1349 Net power is 2.5 HP; 1.9 kW) and 4.9 Nm (0.5 kg·m; 3.6 ft·lb) at 2,400 rpm of torque.
General information
Engine Specifications
Model
FJ100D
Type
4-stroke, OHV, single cylinder
Displacement
98 cm 3 (5.98 cu-in)
Max. horsepower
3.0 PS (2.2 KW; 3.0 HP) at 3,600 rpm
Max. torque (crank PTO)
4.9 Nm (0.5 kg·m; 3.6 ft·lb) ta 2,400 rpm
Carburetor
Float type with fixed main jet
Cooling system
Forced-air
Ignition system
Flywheel magneto transistor type
Lubricating system
Splash
Starting system
Recoil starter
Stoping system
Ignition primary circuit ground
Fuel used
Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity
1.8 L (1.7 US qt)
Fuel consumption
298 g/HPh
PTO shaft rotation
Counterclockwise (from PTO shaft side)
Dimensions and Weight
Kawasaki FJ100D
Length
304 mm (12.0 in)
Width
279 mm (11.0 in)
Height
314 mm (12.4 in)
Dry weight
10.5 kg (23.0 lbs)
Tightening torque specs
Tightening torque specs
Connecting rod bolt
9 Nm; 0.9 kg·m; 6.6 ft·lb
Cylinder head bolt
32 Nm; 3.2 kg·m; 23.6 ft·lb
Flywheel nut
25 Nm; 2.5 kg·m; 18.4 ft·lb
Valve clearance lock nut
7 Nm; 0.7 kg·m; 6 ft·lb
Crankcase cover
9 Nm; 0.9 kg·m; 6.6 ft·lb
Oil drain plug
32 Nm; 3.3 kg·m; 24 ft·lb
Spark plug
23 Nm; 2.3 kg·m; 17 ft·lb
Service Information
Engine
Maximum speed
4,000 ± 100 rpm
Idle speed
1,600 ± 150 rpm
Cylinder compression
2.0 kg/cm2 (29 psi) at 600 rpm
Valve clearance
Intake valve clearance
0.12 mm (0.0047 in)
Exhaust valve clearance
0.12 mm (0.0047 in)
Oil system
Oil type
4-stroke or an equivalent (SF, SG, SH, or SJ)
Recommended oil
SAE 10W-30
Oil capacity
0.45 L (0.43 US. qt)
Ignition system
Spark plug
NGK: BR6HS
Spark plug gap
0.7-0.8 mm (0.028-0.031 in)
Ignition coil air gap
0.3 mm (0.012 in)
Author:Sergei WersAbout: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.
The Kawasaki FJ100D is a 0.1 l (98 cc, 5.98 cu-in) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine with horizontal shaft manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications. 
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