Rato R180

Rato R180The Rato R180 is a 179 cc (10.9 cu-in) single-cylinder air-cooled 4-stroke internal combustion general-purpose gasoline engine with horizontal shaft manufactured by Chongqing RATO Holding (Group) CO., LTD.

The Rato R180 engine has an OHV design; flat suction valve carburetor; recoil starter or electric starter, transistorized magneto ignition (TCI) system and centrifugal mechanical governor system.

A 65.0 mm (2.56 in) cylinder bore and 54.0 mm (2.13 in) piston stroke give the Rato R180 motor a total of 179 cc of displacement. Compression ratio rating is 8.5±0.3:1. It produced 6.0 HP of horsepower at 3,600 rpm and 9.0 N·m (0.92 kg·m, 6.64 ft·lb) of torque at 2,500 rpm.

General information

Engine Specifications
ModelR180
Type4-stroke, OHV, single cylinder
Displacement179 cm 3 (10.9 cu-in)
Max. horsepower6.0 HP at 3,600 rpm
Max. torque (crank PTO)9.0 N·m (0.92 kg·m, 6.64 ft·lb) at 2,500 rpm
CarburetorFlat suction valve carburetor
Cooling systemForced-air
Ignition systemTransistorized magneto ignition (TCI)
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

The Rato R180 engine has cast-iron cylinder liner, dual ball bearings and steel forged and hardened crankshaft.

Cylinder block
Compression ratio:8.5:1
Bore x Stroke65 X 54 mm (2.56 x 2.13 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Valves:2

Service Information

Engine
Maximum speed3800 ± 200 rpm
Idle speed1550 ± 150 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)
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