The 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 | |
| Model | R180 |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 179 cm 3 (10.9 cu-in) |
| Max. horsepower | 6.0 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 |
| Carburetor | Flat suction valve carburetor |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto ignition (TCI) |
| 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
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 Stroke | 65 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 speed | 3800 ± 200 rpm |
| Idle speed | 1550 ± 150 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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