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.
|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|
|Ignition system||Transistorized magneto ignition (TCI)|
|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.
|Bore x Stroke||65 X 54 mm (2.56 x 2.13 in)|
|Warpage (limit)||0.10 mm (0.004 in)|
|Maximum speed||3800 ± 200 rpm|
|Idle speed||1550 ± 150 rpm|
|Cylinder compression||12.0 kg/cm2 at 1400 rpm|
|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 type||4-stroke or an equivalent (SJ)|
|Recommended oil||SAE 10W-30, 15W-40|
|Oil capacity||0.6 L|
|Spark plug gap||0.7-0.8 mm (0.028-0.031 in)|