Rato RV225

Rato RV225The Rato R225 is a 223 cc (13.6 cu-in) single-cylinder air-cooled 4-stroke internal combustion general-purpose gasoline engine with vertical shaft manufactured by Chongqing RATO Holding (Group) CO., LTD for different applications: lawn mowers, mini-tillers, High-pressure washers, shredders.

The Rato RV225 engine has a single-cylinder with a vertical shaft; an overhead valve (OHV) design; flat suction valve carburetor; dual element air filtration system; capacitance discharge type or inductance discharge type ignition system; centrifugal mechanical governor system and recoil starter.

A 70.0 mm (2.76 in) cylinder bore and 58.0 mm (2.28 in) piston stroke give the Rato R225 motor a total of 223 cc of displacement. Compression ratio rating is 8.3:1. It produced 4.0 kW of horsepower at 3,600 rpm and 12.5 N·m (1.27 kg·m, 9.2 ft·lb) of torque at 2,500 rpm.

General information

Engine Specifications
Model RV225
Type 4-stroke, OHV, single cylinder
Displacement 223 cm 3 (13.6 cu-in)
Max. horsepower 4.0 kW at 3,600 rpm
Max. torque (crank PTO) 12.5 N·m (1.27 kg·m, 9.2 ft·lb) at 2,500 rpm
Carburetor Flat suction valve carburetor
Cooling system Forced-air
Ignition system Capacitance discharge type or inductance discharge type
Lubricating system Splash
Starting system Recoil / 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)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.3:1
Bore x Stroke 70 X 58 mm (2.76 x 2.28 in)
Sleeve internal diameter 70.00 mm (2.7559 in)
Piston skirt outer diameter 69.985 mm (2.7553 in)
Number of piston rings (compression / oil): 2 / 1
Ring side clearance Top/Second 0.015-0.045 mm (0.0006-0.0018 in)
Ring end gap Top/Second 0.20-0.40 mm (0.008-0.016 in)
Oil 0.15-0.35 mm (0.006-0.014 in)
Ring width Top/Second 1.5 mm (0.060 in)
Oil 2.0 mm (0.079 in)
Connecting rod small end ID 18.005 mm (0.7087 in)
Connecting rod big end ID 30.02 mm (1.182 in)
Crankshaft crank pin outer diameter 29.98 mm (1.180 in)
Cylinder Head
Warpage (limit) 0.10 mm (0.004 in)
Valve Arrangement: OHV
Valves: 2
Stem outer diameter (standard): INTAKE 5.48 mm (0.216 in)
EXHAUST 5.44 mm (0.214 in)
Cam height: INTAKE 27.7 mm (1.09 in)
EXHAUST 27.75 mm (1.093 in)
Valve spring free length: 34.0 mm (1.3386 in)
Camshaft journal diameter: 13.984 mm (0.5505 in)

Service Information

Maximum speed 3800 ± 200 rpm
Cylinder compression 12.0 kg/cm2 at 1400 rpm
Valve clearance
Intake valve clearance 0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance 0.20±0.02 mm (0.008±0.001 in)
Oil system
Oil type 4-stroke or an equivalent (SJ)
Recommended oil SAE 10W-30, 15W-40
Oil capacity 0.6 L
Ignition system
Spark plug NGK: BPR6ES
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)
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