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Hustler Fastrak Kawasaki Engine Swap

#1

D

dvcochran

I have a Hustler with a Kawasaki FR691V - AS27 - Engine that has a damaged cylinder.
I also have a Cub Cadet with a good Kawasaki FH721V-S01.
Can anyone advise whether this would be a direct swap for the damaged engine?


#2

B

bertsmobile1

They should if the engine plugs are the same and the PTO shafts are the same diameter 1" or 1.125"
The crankcase & cylinder castings should be the same so the muffler should swap directly over


#3

D

dvcochran

bertsmobile1 said:
They should if the engine plugs are the same and the PTO shafts are the same diameter 1" or 1.125"
The crankcase & cylinder castings should be the same so the muffler should swap directly over
Click to expand...
I have the complete mower with the Cub. It runs fine with about 500 hours it is just slow.
Could I just use the Cub engine with the pto that is on it?
I also wondered about the wiring. I see that the Hustler has a separate starter relay. May have to figure that out.


#4

L

LawnWizard

Assuming the shafts are the same (diameter, length and slot) I'd go with the PTO clutch off the Hustler just so that the deck belt will be correct. You can figure out what belt you'll need if the clutches are different but using the correct got the mower will make it easier.
One more thing: are the charging amps the same? The Hustler should be 30 AMP (I think), don't know about the donor.


#5

B

bertsmobile1

dvcochran said:
I have the complete mower with the Cub. It runs fine with about 500 hours it is just slow.
Could I just use the Cub engine with the pto that is on it?
I also wondered about the wiring. I see that the Hustler has a separate starter relay. May have to figure that out.
Click to expand...
Probably
You will need to work out an anchor for the PTO and the blades might end up being a little faster( pulley bigger ) or slower ( pulley smaller )


#6

T

txmowman

dvcochran said:
I have a Hustler with a Kawasaki FR691V - AS27 - Engine that has a damaged cylinder.
I also have a Cub Cadet with a good Kawasaki FH721V-S01.
Can anyone advise whether this would be a direct swap for the damaged engine?
Click to expand...
The PTO is not the same and the muffler mount is different as well. This FH will not direct replace your FR.


#7

H

hlw49

Cranks are different both are 1 1/8 but the length is different 4 9/32 on the FR and 3 15/16 on the FH. Nothing is the same on the two engines. FR730-DS16S replaces it MSRP $1937.12


#8

H

hlw49

FR730-S16S smallenginewarehouse.com has one for $1,739.00


#9

H

hlw49

LawnWizard said:
Assuming the shafts are the same (diameter, length and slot) I'd go with the PTO clutch off the Hustler just so that the deck belt will be correct. You can figure out what belt you'll need if the clutches are different but using the correct got the mower will make it easier.
One more thing: are the charging amps the same? The Hustler should be 30 AMP (I think), don't know about the donor.
Click to expand...
15 amp charging on the Hustler


#10

L

LawnWizard

I didn't look mine up, I was going by the fact that all my FX 850s and FX1000s are 30 amp.
Sorry if I provided bad info.


#11

D

dvcochran

bertsmobile1 said:
Probablyth
You will need to work out an anchor for the PTO and the blades might end up being a little faster( pulley bigger ) or slower ( pulley smaller )
Click to expand...
That has been the only real issue I ran into so far. I had to grind the anchor off the Cub and weld it on the Hustler. I have a longer throttle cable on the way. The throttle and choke cable route on the same side for the FR and route from both sides of the engine on the FH. Hopefully not a big deal.
The diameter of the clutch on the FH is smaller but the pulleys are the same diameter. If the engine does fine but the smaller clutch becomes a problem I may have a bushing made to accept the 1.5" clutch off the FR. Fingers crossed.


#12

D

dvcochran

bertsmobile1 said:
Probably
You will need to work out an anchor for the PTO and the blades might end up being a little faster( pulley bigger ) or slower ( pulley smaller )
Click to expand...


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