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
ModelRV225
Type4-stroke, OHV, single cylinder
Displacement223 cm 3 (13.6 cu-in)
Max. horsepower4.0 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
CarburetorFlat suction valve carburetor
Cooling systemForced-air
Ignition systemCapacitance discharge type or inductance discharge type
Lubricating systemSplash
Starting systemRecoil / electric starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio:8.3:1
Bore x Stroke70 X 58 mm (2.76 x 2.28 in)
Sleeve internal diameter70.00 mm (2.7559 in)
Piston skirt outer diameter69.985 mm (2.7553 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop/Second0.015-0.045 mm (0.0006-0.0018 in)
Ring end gapTop/Second0.20-0.40 mm (0.008-0.016 in)
Oil0.15-0.35 mm (0.006-0.014 in)
Ring widthTop/Second1.5 mm (0.060 in)
Oil2.0 mm (0.079 in)
Connecting rod small end ID18.005 mm (0.7087 in)
Connecting rod big end ID30.02 mm (1.182 in)
Crankshaft crank pin outer diameter29.98 mm (1.180 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Valves:2
Stem outer diameter (standard):INTAKE5.48 mm (0.216 in)
EXHAUST5.44 mm (0.214 in)
Cam height:INTAKE27.7 mm (1.09 in)
EXHAUST27.75 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

Engine
Maximum speed3800 ± 200 rpm
Cylinder compression12.0 kg/cm2 at 1400 rpm
Valve clearance
Intake valve clearance0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance0.20±0.02 mm (0.008±0.001 in)
Oil system
Oil type4-stroke or an equivalent (SJ)
Recommended oilSAE 10W-30, 15W-40
Oil capacity0.6 L
Ignition system
Spark plugNGK: BPR6ES
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
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.

1 Comment

Leave a Reply

Your email address will not be published.


*