The Rato R210 is a 212 cc (12.94 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 R210 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 70.0 mm (2.76 in) cylinder bore and 55.0 mm (2.16 in) piston stroke give the Rato R210 motor a total of 212 cc of displacement. Compression ratio rating is 9.0:1. It produced 7.0 HP of horsepower at 3,600 rpm and 12.0 N·m (1.22 kg·m, 8.85 ft·lb) of torque at 2,500 rpm.
General information
| Engine Specifications | |
| Model | R210 |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 212 cm 3 (12.94 cu-in) |
| Max. horsepower | 7.0 HP at 3,600 rpm |
| Max. torque (crank PTO) | 12.0 N·m (1.22 kg·m, 8.85 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 R210 engine has cast-iron cylinder liner, dual ball bearings and steel forged and hardened crankshaft.
| Cylinder block | ||
| Compression ratio: | 9.0:1 | |
| Bore x Stroke | 70 X 55 mm (2.76 x 2.16 in) | |
| Sleeve internal diameter | 70.00 mm (2.7559 in) | |
| Piston skirt outer diameter | 69.985 mm (2.7553 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top/Second | 0.015-0.045 mm (0.0006-0.0018 in) |
| Ring end gap | Top/Second | 0.20-0.40 mm (0.008-0.016 in) |
| Oil | 0.15-0.35 mm (0.006-0.014 in) | |
| Ring width | Top/Second | 1.5 mm (0.060 in) |
| Oil | 2.0 mm (0.079 in) | |
| Connecting rod small end ID | 18.005 mm (0.7087 in) | |
| Connecting rod big end ID | 30.02 mm (1.182 in) | |
| Crankshaft crank pin outer diameter | 29.98 mm (1.180 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | OHV | |
| Valves: | 2 | |
| Stem outer diameter (standard): | INTAKE | 5.48 mm (0.216 in) |
| EXHAUST | 5.44 mm (0.214 in) | |
| Cam height: | INTAKE | 27.7 mm (1.09 in) |
| EXHAUST | 27.75 mm (1.093 in) | |
| Valve spring free length: | 34.0 mm (1.3386 in) | |
| Camshaft journal diameter: | 13.984 mm (0.5505 in) | |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod bolt | 13 Nm; 1.3 kg·m; 9.6 ft·lb |
| Oil dran plug | 22 Nm; 2.2 kg·m; 16 ft·lb |
| Crankcase cover | 28 Nm; 2.8 kg·m; 21 ft·lb |
| Flywheel subassembly | 75 Nm; 7.5 kg·m; 55 ft·lb |
| Cylinder head subassembly | 32 Nm; 3.2 kg·m; 23.6 ft·lb |
| Rocker shaft bolt | 24 Nm; 2.4 kg·m; 18 ft·lb |
| Cylinder head cover | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Spark plug | 28 Nm; 2.8 kg·m; 21 ft·lb |
| Ignition coil | 10 Nm; 1.0 kg·m; 7 ft·lb |
Service Information
| Engine | |
| Maximum speed | 3800 ± 200 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 |
| Carburetor | |
| Main jet | 0.85 |
| Float height | 13.7 mm (0.54 in) |
| Pilot screw opening | 2-1/8 turns out |
| Ignition system | |
| Ignition timing | 20° B.T.D.C. (Fixed) |
| Spark plug | NGK: BPR6ES |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Primary ignition coil resistance | 0.8-1.0 Ω |
| Secondary ignition coil resistance | 5.9-7.1 kΩ |
| Ignition coil air gap | 0.4 ± 0.2 (0.016 ± 0.008) |
Author:
Hi ,
I noticed that there are two yellow caps. One is oil dipstick and the other one is oil plug. To which one do we need to put in engin oil?
Thanks.
Oil is added through the dipstick, the oil plug needs to drain the oil from the engine when replacing.
Does not matter.
Both have the same function and depending how the motor is installed one might be blocked and can not be used.
im looking for an air filter for a poulan pro power series 174cc push behind lawn mower. the numbers locate at the base of the engine is Z870130 and the the next number was 171207B. the other number located was *RV175591440601* and the next number was *A1712003936*. have not been able to find replacement parts. for the lawn mower your assistantance will be appreciated. what about engine parts list also. so i can order parts. if needed. thanks.
IMHO yours lawn mower uses the Rato RV175 engine, but we are not a trading company, so we can`t help you with spare parts.
Where to find a rato R210Iii generator engine
Rato recommends 15W-40 motor oil. This is for diesel engines and not readily available. Why such a heavy duty oil?
From manual: “General oil: SAE 15W-40 SJ class or equivalent API classified SJ class SAE10W-30 oil”.
It is a standard Motor Oil for the whole year and can be bought everywhere in Estonia and rest of EU.
The 7.0HP (5,1kW) is only the PeakPower.
Does someone know the continuous Power of the Engine?
I want to use the engine as charging Generator using a Dual-Fuel Carburetor and a Truck Alternator.
I asume, the RATO make 4,4kW continuous, hence I could calculate 4,4kW * 0,6 efficiency of the Alternator / 28 V = 94A.
Since I do not want to run the Alternator under full load, but only 75%, the Alternator should be a 120A one.
Since an Alternator has not very much Iron in it, the magnetic field is very fast saturated and the Alternator should have its 60% efficiency at full load, which mean, running an Alternator with only 75% of its rated power should increase the efficiency.
Hence, if I am right, I could use a 140Ah one.
Any comments and/or suggestions?
I am in Estonia and you can contact me also directly under mma4miisu@gmail.com
Have a nice day or whatever.
I am trying to get a copy of a manual for the RATO 210cc pressure washer engine. Is there anyway you could send me a copy. Thank you.
Hello,
can I use synthetic oil eg 5W-30 instead of 15W-40? Engine in new.
or 5W-40. Generally I want to use synthetic oil instead mineral. Is there posible to use for this engine?
Why are there no dipsticks? just 2 caps on opposite sides.. Do I just fill until it spills out?
Where is bypass valve as won,t kick down when trigger is out and dies quick,at least this is 1 problem i read about