The Kawasaki FR691V 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 FR691V has 90 degrees V-twin design with vertical PTO shaft, overhead valves, cast iron cylinder liners, spherical combustion chamber and 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 FR691V produced 20.9 PS (15.4 kW; 20.6 HP) at 3,600 rpm or 23.4 PS (17.2 kW; 23.0 HP) at 3,600 rpm of maximum horsepower and 53.7 Nm (5.5 kg·m; 39.6 ft·lb) at 2,000 rpm or 53.6 Nm (5.5 kg·m; 39.6 ft·lb) at 2,000 rpm of torque.
General information
| Engine Specifications | |
| Model | FR691V |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 726 cm 3 (44.3 cu-in) |
| Max. horsepower |
20.9 PS (15.4 KW; 20.6 HP) at 3,600 rpm 23.4 PS (17.2 KW; 23.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) |
53.7 Nm (5.5 kg·m; 39.6 ft·lb) at 2,000 rpm 53.6 Nm (5.5 kg·m; 39.6 ft·lb) at 2,000 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 FR691V | |
| 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: 1.7 litre Without oil filter: 1.5 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:
why can I not find the capacity of the fuel tank on the fr691v engine ???
Because Kawasaki vertical engines are not equipped with fuel tanks
You will need to look for that under the equipment (mower, etc.) manual.
Because it’s not part of the Kawasaki Vertical Engine Assembly
How can I find out the shaft size?
691v crank shaft length and width
i have an older hustler with a fr651v engine will a fr691v be compatible (same shaft size )
On the Fr691v
How can I find out the shaft size for the FR691V?
Where is the Kawasaki FR691V engine made. Parts and final assembly.
hello. on the KAWASAKI FR691V, how do i know if i need to use 10-30W or 10-40W?
The Kawasaki manual state’s to use 10W-30 if the outside temperature is 14F to 90F. Use 10W-40 if the outside temperature is 14F to over 104F. I use 10W- 40 since the temperature here in the south in the summer is usually hot and humid. Check your Kawasaki manual if you have one.
10-40
Does my FR691V 726cc have the wrong dipstick? stated cap. 1.7L one pint shows overfull.
I need a shroud for my 691v part number 59066-xxxx. How do I know which one my engine uses? It’s on a cub cadet mower.
Where can I find a starter solenoid for the 691V?
Can I get Manual for my fr691v engine ???
https://cdn.sanity.io/files/nyxfdb77/production/37e52e9325361b4f5e7fdeccbbd0bb8152049234.pdf
What is the part number for the oil drain valve on my fr691v?
The FR691V manual shows a fuel shut-off valve. Where is it located?
If I change to canister air cleaner, swap manifold and carb for double… I lose 1hp … Why? Why does the fx691v have 22hp and the fr691v has 23hp… If I change to bigger carb and more air… I lose HP? Please explain.
Could be a couple of reasons. Compression ratio, camshaft specs, etc.
OR it could just be where they decided to dyno the engine at. You can find the dynograph of the FR691V. There’s the 23HP Kawi 691v and the 25/26hp Kohler. The Kohler makes 2 more ft-lbs of torque but at 2600RPM while the Kawi makes 40 ft-lbs of torque at 2200RPM.
The Kohler has something like a 3.3″ bore and 2.7″ stroke while the Kawi has a (roughly) 3″ bore x 3″ stroke.
Now, assuming you have the same block, bore, stroke, the difference could be the RPM where the measurement is given or there could be some upgrades done to the heads/cam.
It’s why I’d take, and did take, the Kawi FR691v over that Kholer KT745. The Kawisaki is designed more like a working engine. It’s got a square borexstroke. It makes peak torque quite a bit lower in the RPM range and is only short by 2 ft-lbs. It’s like the old 300 I6 vs 302 V8 debate, but it ain’t that serious.
And maybe your horsepower measurement is at the exact same RPM. If so, then yeah, going with a bigger carb and more air is going to move your peak power up higher in the RPM range, so you need to know that it’s running at that higher RPM to take advantage of your set up.
It’s like taking any engine and opening up the exhaust and intake. They tend to lose a little down low. These engines are rated @ 3600RPM.. and that’s probably where the default throttle “max” position puts them. But you know good and well they’ll do 5000RPM if you rev ’em… not that you’d want to mow that way. Waste of fuel and it wouldn’t be making as much power up there. I’ve seen the dynograph of the Kawi FR691V. It’s only a couple of ft-lbs shy of max torque at 1200RPM. It’s got that excellent power curve from the larger stroke.. among other things, but yea. It makes power all through the throttle range. Of course, you aren’t going to get it to do that without fiddling around to put a heavy load and full throttle and hold it at 1200RPM. I’m just saying, on the engine dyno, it shows the torque and horsepower curves. It’s exactly what you’d want to see in a 460 Ford haha.
How many spark plugs does the Kawasaki fr691v have?
It’s a V-twin engine so 2 spark plugs. 1 spark plug per cylinder.