The Kawasaki FR651V is a 0.73 l (726 cc, 44.3 cu-in) V-twin 90° air-cooled 4-stroke internal combustion small gasoline engine with vertical shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications, such as residential zero-turn mowers, lawn and garden tractors.
The FR651V has 90 degrees V-twin design with vertical PTO shaft, overhead valves, cast iron cylinder liners, and spherical combustion chamber, rotating metal grass chopper screen. The engine is equipped with the electronic spark ignition system and internally vented carburetor with fuel shut-off solenoid. The motor uses a high-performance lubrication system and single-stage air filter.
The engine has an automatic compression release (ACR) system with bendix type starter. 13A or 20A charge coils are available as an option.
It has a 78.0 mm (3.07 in) cylinder bore and 76.0 mm (2.99 in) piston stroke. Compression ratio rating is 8.2:1. The Kawasaki FR651V produced 19.2 PS (14.1 kW; 18.8 HP) at 3,600 rpm or 21.8 PS (16.0 kW; 21.5 HP) at 3,600 rpm of maximum horsepower and 53.2 Nm (5.43 kg·m; 39.26 ft·lb) at 1,800 rpm or 53.3 Nm (5.44 kg·m; 39.34 ft·lb) at 2,200 rpm of torque.
General information
| Engine Specifications | |
| Model | FR651V |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 726 cm 3 (44.3 cu-in) |
| Max. horsepower | 19.2 PS (14.1 KW; 18.8 HP) at 3,600 rpm 21.8 PS (16.0 KW; 21.5 HP) at 3,600 rpm |
| Max. torque (crank PTO) | 53.2 Nm (5.43 kg·m; 39.26 ft·lb) at 1,800 rpm 53.3 Nm (5.44 kg·m; 39.34 ft·lb) at 2,200 rpm |
| Carburetor | Internally vented with fuel shut-off solenoid |
| Cooling system | Air-cooling |
| Ignition system | Electronic spark ignition |
| Lubricating system | Full pressure with spin-on oil filter |
| Starting system | Bendix type starter |
| Charging system | 13A or 20A charge coil (option) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel consumption | 245 g/HPh |
| Cooling system | Pressurized forced circulation type |
Dimensions and Weight
| Kawasaki FR651V | |
| Length, mm (in) | 501 (19.7) |
| Width, mm (in) | 466 (18.3) |
| Height, mm (in) | 392 (15.4) |
| Dry weight, kg (lb) | 40.0 (88.2) |
Tightening torque specs
| Tightening torque specs | Cylinder head | 46 Nm; 4.6 kg·m; 33.9 ft·lb |
| Connecting rod | 10 Nm; 1.0 kg·m; 7.4 ft·lb |
| Flywheel | 56 Nm; 5.7 kg·m; 41.3 ft·lb |
| Crankcase cover | 27.5 Nm; 2.75 kg·m; 20.3 ft·lb |
| Intake manifold | 9 Nm; 0.9 kg·m; 6.6 ft·lb |
| Oil drain plug | 7 Nm; 0.7 kg·m; 5.2 ft·lb |
| Valve clearance lock nut | 11 Nm; 1.1 kg·m; 8.1 ft·lb |
Maintenance data
| Engine | |
| Maximum speed | 3500 ± 100 rpm |
| Idle speed | 1500 ± 100 rpm |
| Cylinder compression | 4.5 kg/cm2 (64 psi) at 500 rpm |
| Valve clearance | |
| Intake valve | 0.10-0.15 mm (0.004-0.006 in) |
| Exhaust valve | 0.10-0.15 mm (0.004-0.006 in) |
| Oil system | |
| Oil type | 4-stroke or an equivalent (SJ or higher class) |
| Recommended oil | SAE 10W-40, 10W-30 |
| Oil capacity (with filter changed) | With oil filter: 2.1 litre Without oil filter: 1.8 litre |
| Ignition system | |
| Spark plug | NGK: BPR4ES |
| Spark plug gap | 0.7-0.8 mm (0.027-0.031 in) |
| Ignition coil air gap | 0.2-0.4 mm (0.008-0.011 in) |
| Spark plug tightening torque | 22 Nm; 2.2 kg·m; 16.2 ft·lb |
Author:
If this motor has automatic compression release ,how can you check cylinder compression?
I’ve checked it , and have 30 lbs left cylinder 90 lbs right cylinder
JUST HAD THE SAME ISSUE CK YOUR PUSHRODS I HAD A BENT ONE SO I REPLACED ALL 4 RUNS LIKE A CHAMP
please all I want to know is how much oil I should put in a Kawasaki 21.5 hp fr651v engine ?????????? one little question
2 quarts
Start with 1.3qt, then check it.
1.8 Li5re’s
i need to know how much oil in quarts and oz. my kawasakie FR651V engine takes with and with out a filter
1.8 quarts with out filter change.
2.2 quarts with filter change.
With oil filter: 2.1 litre
Without oil filter: 1.8 litre
I measured what came out which was about 1.3 quarts
2.1 kilter with filter or 1.8 without filter
New mower FS 651v 5hrs use started smoking blue smoke on start up . Engine replaced problem now occurring again. Smokes on start any suggestions appreciated .
When I made the first oil change only about 1 1/3 quart came out. I removed the filter and let the oil drain for about ten minutes. I installed the new filter, added two quarts of fresh oil and started the engine. It immediately started to blow blue smoke. I shut off the engine and checked the oil level that showed it was well above the full line. I drained out close to half a quart and the dipstick showed it was right at the full mark. I then mowed the lawn and rechecked the oil when finished. It was exactly at the full mark. If this engine takes 2.1 liters of oil it must hide it somewhere.
Good advice! you are correct. If you are married, it has been a long time since you heard those words addressed to you.
Burning too rich.
i have the same problems these people are talking about mine got worse back and fourth to dealer , first blow head gasket at 20 Hours got it back not enough compression, burning oil , it misfire back fire back to dealer could not find anything wrong but something was wrong so they changed a bunch of parts they called me said come in and i did went to back it was still same but worse. He said we put the best mechanics on this and nothing works but found the problem and it can be fixed with new engine cam shaft was bent was one, where the cam sets down into the hole ,he gave a a name ,was broken , not fixable , that two and governor clips are sheared inside the motor . since it was under warranty and under low hours money back or new zero turn mower , i got my money back owner said he would do the same so that saying a lot about these engines
I think it takes less oil than the manual specifies.
The oil stem loosens. You need to unscrew the mounting bracket, locate the separation, and use RTV silicon very carefully to seal the oil stem. You are getting smoking because oil is leaking from this location and dripping onto the exhaust.
You are right! Good advice given. If you are married, I bet it has been a long time since you heard those words.
Thanks for the timely, and complete information.
Is the bolt holding the electric clutch in place left of right hand thread??
How hard is it to find the part number of the oil filter. Sheeesh!