Kawasaki FH381V KAI

Kawasaki FH381V KAIThe Kawasaki FH381V is a 0.43 l (431 cc, 26.3 cu-in) V-twin 90° air-cooled 4-stroke internal combustion small gasoline engine with vertical shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications. The Kai’s are the newer series engine. The Japanese word “KAI” means evolution, advancement and renewal. The FH381V KAI engine is based on the FH381V motor, but it has some changes such as: redesigned air cleaner and blower housings, new air filter options, internally vented carburetor, an advanced lubrication system design, and enhancements for optimal startability.

The FH381V KAI has vertical PTO shaft; V-twin 90° design with cast iron cylinder liners and overhead valves (OHV). The engine is equipped with an internally vented carburetor with fuel shut-off solenoid and electronic spark ignition system. The Kawasaki FH381V KAI engine uses a full pressure lubrication system with spin-on oil filter and dual element air cleaner.

The engine has bendix type electric starter, automatic compression release system (ACR) and 12V-13A charging coil with a regulator.

It has a 65 mm (2.56 in) cylinder bore and 65 mm (2.56 in) piston stroke. Compression ratio rating is 8.5:1. The Kawasaki FH381V KAI produced 13.2 PS (9.7 kW; 13.0 HP) at 3,600 rpm and 27.5 Nm (2.8 kg·m; 20.3 ft·lb) at 2,400 rpm of torque.

General information

Engine Specifications
ModelFH381V KAI
Type4-stroke, OHV, V-twin 90°
Displacement431 cm 3 (26.3 cu-in)
Max. horsepower13.2 PS (9.7 KW; 13.0 HP) at 3,600 rpm
Max. torque (crank PTO)27.5 Nm (2.8 kg·m; 20.3 ft·lb) at 2,400 rpm
CarburetorInternally vented carburetor
Cooling systemAir-cooling
Ignition systemElectronic spark ignition
Lubricating systemFull pressure with spin-on oil filter
Starting systemElectric starter
Charging system12 Volt – 13A with regulator
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption245 g/HPh
Cooling systemPressurized forced circulation type

Tightening torque specs

Tightening torque specs
Cylinder head25 Nm; 2.2 kg·m; 18.5 ft·lb
Connecting rod6 Nm; 0.6 kg·m; 4.4 ft·lb
Flywheel56 Nm; 5.7 kg·m; 41.3 ft·lb
Crankcase cover25 Nm; 2.2 kg·m; 18.5 ft·lb
Intake manifold7 Nm; 0.7 kg·m; 5.2 ft·lb
Valve clearance lock nut7 Nm; 0.7 kg·m; 5.1 ft·lb

Maintenance data

Engine
Maximum speed3500 ± 100 rpm
Idle speed1500 ± 100 rpm
Cylinder compression3.9 kg/cm2 (56 psi) at 500 rpm
Valve clearance
Intake valve0.10-0.15 mm (0.004-0.006 in)
Exhaust valve0.10-0.15 mm (0.004-0.006 in)
Oil system
Oil type4-stroke or an equivalent (SF, SG, SH, or SJ )
Recommended oilSAE 10W-40, 10W-30, 5W-20
Oil capacity (with filter changed)1.8 litre (1.9 US.qt.)
Ignition system
Spark plugCHAMPION: RCJ8Y; NGK: BPMR6A
Spark plug gap0.75 mm (0.029 in)
Spark plug tightening torque22 Nm; 2.2 kg·m; 16.2 ft·lb
ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

Be the first to comment

Leave a Reply

Your email address will not be published.


*