The 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 | |
| Model | FJ400D |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 401 cm 3 (24.47 cu-in) |
| Max. horsepower | 13.2 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 |
| Carburetor | Float type with fixed main jet |
| Cooling system | Forced-air |
| Ignition system | Transistorized flywheel magneto |
| Lubricating system | Splash |
| Starting system | Shift type electric starter |
| Stoping system | Ignition primary circuit ground |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Kawasaki FJ400D | |
| Length | 330 mm (13.0 in) |
| Width | 430 mm (16.9 in) |
| Height | 313 mm (12.3 in) |
| Dry weight | 31.5 kg (69.5 lbs) |
Service Information
| Engine | |
| Maximum speed | 4,000 ± 100 rpm |
| Idle speed | 1,150 ± 150 rpm |
| Oil system | |
| Oil type | 4-stroke or an equivalent (SF, SG, SH, or SJ) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 1.3 L |
| Ignition system | |
| Spark plug | NGK: BPR5ES |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Ignition coil air gap | 0.3 mm (0.012 in) |
What is good compression reading ?
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.
Is there a port that could feed an oil cooler on one of these ? Mine is from an EZGO golf cart.