The Rato RV140 is a 140 cc (9.15 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 lawn mowers and tillers.
The Rato RV140 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 ignition system; centrifugal mechanical governor system and recoil starter.
The Rato RV140 motor has a 65.0 mm (2.56 in) cylinder bore and 42.0 mm (1.65 in) piston stroke with a compression ratio of 8.5:1. It produced 4.0 HP at 3,600 rpm of horsepower and 6.3 N·m (0.64 kg·m, 5.75 ft·lb) at 2,500 rpm of torque.
|Type||4-stroke, OHV, single cylinder|
|Displacement||140 cm 3 (8.54 cu-in)|
|Max. horsepower||4.0 HP at 3,600 rpm|
|Max. torque (crank PTO)||6.3 N·m (0.64 kg·m, 4.6 ft·lb) at 2,500 rpm|
|Carburetor||Flat suction valve carburetor|
|Ignition system||Capacitance Discharge Ignition (CDI)|
|Starting system||Recoil starter|
|Stoping system||Ignition primary circuit ground|
|Fuel used||Unleaded gasoline (octane number 86 or higher)|
|Fuel tank capacity||1.0 L|
|PTO shaft rotation||Counterclockwise (from PTO shaft side)|
|Valve clearance (Cold)|
|Intake valve (COLD)||0.15 mm (0.006 in)|
|Exhaust valve (COLD)||0.20 mm (0.008 in)|
|Oil type||4-stroke or an equivalent (SJ)|
|Recommended oil||SAE 10W-30, 15W-40|
|Oil capacity||0.45 L|
|Spark plug||NGK: BPR6ES|
|Spark plug gap||0.7-0.8 mm (0.028-0.031 in)|