Kawasaki FJ400D

Kawasaki FJ400DThe Kawasaki FJ400D is a 0.4 l (401 cc, 24.47 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 FJ400D engine has an OHV (overhead valve) design; float type carburetor with fixed main jet; transistorized flywheel magneto ignition system; diaphragm type fuel pulse pump; mechanical governor and shift-type electric starter.

Bore and stroke are 82.0 mm (3.23 in) and 76.0 mm (2.99 in), respectively. Compression ratio rating is 8.2:1. The Kawasaki FJ400D motor produced 13.2 PS (9.7 kW; 13.0 HP) at 3,600 rpm of maximum horsepower and 26.5 Nm (2.7 kg·m; 19.6 ft·lb) at 2,400 rpm of torque.

General information

Engine Specifications
ModelFJ400D
Type4-stroke, OHV, single cylinder
Displacement401 cm 3 (24.47 cu-in)
Max. horsepower13.2 PS (9.7 KW; 13.0 HP) at 3,600 rpm
Max. torque (crank PTO)26.5 Nm (2.7 kg·m; 19.6 ft·lb) at 2,400 rpm
CarburetorFloat type with fixed main jet
Cooling systemForced-air
Ignition systemTransistorized flywheel magneto
Lubricating systemSplash
Starting systemShift type electric starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
PTO shaft rotationCounterclockwise (from PTO shaft side)

Dimensions and Weight

Kawasaki FJ400D
Length330 mm (13.0 in)
Width430 mm (16.9 in)
Height313 mm (12.3 in)
Dry weight31.5 kg (69.5 lbs)

Service Information

Engine
Maximum speed4,000 ± 100 rpm
Idle speed1,150 ± 150 rpm
Oil system
Oil type4-stroke or an equivalent (SF, SG, SH, or SJ)
Recommended oilSAE 10W-30
Oil capacity1.3 L
Ignition system
Spark plugNGK: BPR5ES
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Ignition coil air gap0.3 mm (0.012 in)
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3 Comments

    • Depends if it has automatic compression release. If it is a 2015 or newer chances are it does. 126 psi min on the older ones. 90 psi on the 2015 and up. Normally you would be told that you cant get an accurate compression reading on the ACR equipped engine and they are correct. However after diagnosing these things for a few years now, I can say I’m pretty sure that it’s safe to compression check it if it has the ACR. Leak down test is better if you can get one. No more than a 15% loss. 20% percent is pushing it. I hope this helps.

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