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FR691V Kawasaki Engine vs. other Kawasaki Engines

#1

Z

Zeroturner

How well does the FR691V Kawasaki 23 HP engine compare with say the FX? Or, any of the other Kawasaki 23 Hp engines.

It's my understanding that, other the the air filtration systems being different - they're basically the same engine.

Or, are they...?

Do the FR series engines start with lower overall quality or just are as good as any other Kawasaki 23 hp?

Anyone know the various differences?

Thanks!


#2

Nwatson99

Nwatson99

When I went on the big research several years ago reading on air cooled Kawasaki engines yes the air filtering, engine covers, and carburetor was the three things that stood out. The FR was always classified as a heavy duty residential engine and to my knowledge Kawasaki only makes two series engines "rated" better than the FR, which are the FS and FX.


#3

Z

Zeroturner

Nwatson99,

Thanks for the response!

I would like to know what the differences are specifically between the beyond the various series, i.e. filteration, carburetoration, etc.

Or, as I think, maybe except for the above, it's (the FR) basically the same engine?


#4

Z

Zeroturner

I neglected to mention, I saw an ad for a "commercial grade" mower equipped with a FR691V engine, which I thought kind of odd, as it's on my residential grade MX5060.


#5

Nwatson99

Nwatson99

Zeroturner said:
I neglected to mention, I saw an ad for a "commercial grade" mower equipped with a FR691V engine, which I thought kind of odd, as it's on my residential grade MX5060.
Click to expand...

Funny you said that, there are many companies claiming to have a commercial mower that are not.


#6

Z

Zeroturner

I've researched and can't find if the FX is basically the same engine as the FR, except it's provided with a better air filtration system and perhaps a better carb system.

I've looked and looked and I've turned up exactly zero about any other differences.

Anyone here know what the other differences might be?

Thanks!


#7

Nwatson99

Nwatson99

FX691V

Features:
Overhead v-valve
90° V-twin
High performance pressurized lubrication
Electronic spark ignition
Automatic compression release
Rotating grass screen
Dual stage canister air filter
Cast-iron cylinder liners
Metal engine cover
Heavy-duty shift-type starter
Twin barrel, internally vented carburetor with fuel shut-off solenoid


FR691V

Features:
Overhead V-valve
90° V-twin
High performance pressurized lubrication
Electronic spark ignition
Automatic compression release
Internally vented carburetor with fuel shut-off solenoid
Rotating grass screen


#8

Nwatson99

Nwatson99

FX691V
Specifications:
Displacement: 726cm3 (44.3cu. in.)
Number of Cylinders: 2
Bore x Stroke: 3.1 x 3.0 in. (78 x 76mm)
Compression Ratio: 8.2:1
Oil capacity: 2.2U.S. qt (2.1liters)
Maximum Power: 22.0hp (16.4kW) at 3,600rpm
Maximum Torque: 39.4ft lbs (53.4Nｷm) at 2,200RPM
Dry weight: 102.7lbs (46.6kg)


FR691V
Specifications:
Displacement: 726cm3 (44.3cu. in.)
Number of Cylinders: 2
Bore x Stroke: 3.1 x 3.0 in. (78 x 76mm)
Compression Ratio: 8.2:1
Oil capacity: 2.2U.S. qt (2.1liters)
Maximum Power: 23.0hp (17.2kW) at 3,600rpm
Maximum Torque: 39.5ft lbs (53.6Nｷm) at 2,200RPM
Dry weight: 89.0lbs (40.4kg)


#9

Z

Zeroturner

Nwatson99,

I just got back to this thread and the information you provided is just what I was looking for.

Thank you very much!


#10

Nwatson99

Nwatson99

Zeroturner said:
Nwatson99,

I just got back to this thread and the information you provided is just what I was looking for.

Thank you very much!
Click to expand...

You are very welcome, let us know what you go with. :thumbsup:


#11

S

scagman2

Nwatson99 said:
FX691V
Specifications:
Displacement: 726cm3 (44.3cu. in.)
Number of Cylinders: 2
Bore x Stroke: 3.1 x 3.0 in. (78 x 76mm)
Compression Ratio: 8.2:1
Oil capacity: 2.2U.S. qt (2.1liters)
Maximum Power: 22.0hp (16.4kW) at 3,600rpm
Maximum Torque: 39.4ft lbs (53.4Nｷm) at 2,200RPM
Dry weight: 102.7lbs (46.6kg)


FR691V
Specifications:
Displacement: 726cm3 (44.3cu. in.)
Number of Cylinders: 2
Bore x Stroke: 3.1 x 3.0 in. (78 x 76mm)
Compression Ratio: 8.2:1
Oil capacity: 2.2U.S. qt (2.1liters)
Maximum Power: 23.0hp (17.2kW) at 3,600rpm
Maximum Torque: 39.5ft lbs (53.6Nｷm) at 2,200RPM
Dry weight: 89.0lbs (40.4kg)
Click to expand...
How would you compare this with an older model FH601V, besides the difference in horse power. Both just as rugged and durable?


#12

M

Mad Mackie

Engine specs don't provide much for engine comparisons.
You need to get into the parts manuals to compare.
Kawasaki discontinued the vertical shaft FH series engines due to non compliance with ever increasing and demanding emissions requirements.
FS and FX engines are similar except for the carb difference that is needed to go along with the two stage Donaldson air filtration system found on the FX models.
The price of engines to OEMs is much different from that of engine retailers. An FR engine of the same or close HP ratings isn't much cheaper than FS or FX engines. I would never repower an FR with an FR, I would use an FS or preferably an FX engine providing there is enough room for the air filtration system as it makes the engine taller.


#13

5

577jersey

I believe they make these 691,s with two different shaft sizes,Ive seen 1"x3" and 1-1/8x4 and change..so just make sure you know what one you have before you replace it.
Mine has 450 hours and going strong!!!!
577 and Im gone....


#14

7394

7394

Mad Mackie said:
Engine specs don't provide much for engine comparisons.
You need to get into the parts manuals to compare.
Kawasaki discontinued the vertical shaft FH series engines due to non compliance with ever increasing and demanding emissions requirements.
FS and FX engines are similar except for the carb difference that is needed to go along with the two stage Donaldson air filtration system found on the FX models.
The price of engines to OEMs is much different from that of engine retailers. An FR engine of the same or close HP ratings isn't much cheaper than FS or FX engines. I would never repower an FR with an FR, I would use an FS or preferably an FX engine providing there is enough room for the air filtration system as it makes the engine taller.
Click to expand...

The only difference I see (& Please correct me if I'm wrong) between FR & FS, is the FS filter has mesh around it, but otherwise same size filter & same carb & jetting.
And you can get an FS shortblock from Kawasaki.


#15

5

577jersey

7394 said:
The only difference I see (& Please correct me if I'm wrong) between FR & FS, is the FS filter has mesh around it, but otherwise same size filter & same carb & jetting.
And you can get an FS shortblock from Kawasaki.
Click to expand...
Well thats good to know,as long as everything from the FR will bolt right up where golden,I actually wanted to try a Predator engine,if I could get 500 hours outta one it would be worth it to me...by that time Id be ready for a new mower.


#16

7394

7394

I'm not aware of any other differences, & I have been using FS air filters on my FR since it was new (2014).


#17

5

577jersey

7394 said:
I'm not aware of any other differences, & I have been using FS air filters on my FR since it was new (2014).
Click to expand...
The main thing I was curious about is two different shaft sizes that i have been seeing while looking at the FR series..I seen two different sizes for the FR691V???????


#18

7394

7394

Sorry, no help there..............


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