Register free!
Search
 
     

The Green Industry's Resource Center


Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 01-02-2007, 11:19 PM
Accu-cut Lawn Care's Avatar
Accu-cut Lawn Care Accu-cut Lawn Care is offline
LawnSite Bronze Member
 
Join Date: Jul 2006
Location: Chattanooga, TN
Posts: 1,206
Kawasaki 23hp to 25hp conversion

I own an 03 Hustler z with a 23 hp kawasaki engine. It currently has about 1100 hrs on it and still runs great. My question is... When it comes time to rebuild the engine, is it possible to convert it to 25hp? I know that the displacement of the 23 and the 25 are the same...is it differences in the head assembly and carb that make more hp? Any info would be appreciated.
Reply With Quote
  #2  
Old 01-03-2007, 02:00 AM
LCPullman LCPullman is offline
LawnSite Senior Member
 
Join Date: Nov 2006
Location: Pullman, WA
Posts: 589
The carburetors are going to be different. It may be as simple as changing the main jets and idle mixture, but then there may be more involved, I'm not completely sure.

The cylinder heads, intake manifolds, valves and camshaft all have the same part numbers. So its probably entirely a carburetor difference.

If you care to take the time to do this, you could go to http://www.buykawpower.com/kmcb2c/Me...arentID=266149 and compare the part numbers for the two engines FH680V and FH721V. But that will take quite a while.
Reply With Quote
  #3  
Old 01-03-2007, 10:17 AM
pugs pugs is online now
LawnSite Silver Member
 
Join Date: Jun 2006
Location: Southwest of Chicago
Posts: 2,730
Quote:
Originally Posted by Accu-cut Lawn Care View Post
I own an 03 Hustler z with a 23 hp kawasaki engine. It currently has about 1100 hrs on it and still runs great. My question is... When it comes time to rebuild the engine, is it possible to convert it to 25hp? I know that the displacement of the 23 and the 25 are the same...is it differences in the head assembly and carb that make more hp? Any info would be appreciated.
If its time to rebuild the engine, pull the 23 off, stick a new 25 on.
Reply With Quote
  #4  
Old 01-03-2007, 10:26 AM
carcrz's Avatar
carcrz carcrz is offline
LawnSite Silver Member
 
Join Date: Apr 2006
Location: Belton, MO (South KCMO)
Posts: 2,088
Is there anything else that would need to be changed when switching to a 25 hp motor? Or can you just bolt it in & mow.
Reply With Quote
  #5  
Old 01-03-2007, 10:45 AM
Accu-cut Lawn Care's Avatar
Accu-cut Lawn Care Accu-cut Lawn Care is offline
LawnSite Bronze Member
 
Join Date: Jul 2006
Location: Chattanooga, TN
Posts: 1,206
Quote:
Originally Posted by pugs View Post
If its time to rebuild the engine, pull the 23 off, stick a new 25 on.
It's not time to rebuild it. The engine has good compression and runs very well. If it is simply a carb replacement, I think it would be worth the money to replace it to give me some more mulching power when crabgrass season hits.
Reply With Quote
  #6  
Old 01-03-2007, 12:25 PM
pugs pugs is online now
LawnSite Silver Member
 
Join Date: Jun 2006
Location: Southwest of Chicago
Posts: 2,730
Quote:
Originally Posted by Accu-cut Lawn Care View Post
When it comes time to rebuild the engine
Go back and read your original post.
Reply With Quote
  #7  
Old 01-03-2007, 05:01 PM
Accu-cut Lawn Care's Avatar
Accu-cut Lawn Care Accu-cut Lawn Care is offline
LawnSite Bronze Member
 
Join Date: Jul 2006
Location: Chattanooga, TN
Posts: 1,206
Quote:
Originally Posted by pugs View Post
Go back and read your original post.
I was under the impression that head components and such would need to be replaced as well. If changing the carb is all that needs to be done, I would consider doing it now.
Reply With Quote
  #8  
Old 01-05-2007, 02:31 PM
Accu-cut Lawn Care's Avatar
Accu-cut Lawn Care Accu-cut Lawn Care is offline
LawnSite Bronze Member
 
Join Date: Jul 2006
Location: Chattanooga, TN
Posts: 1,206
I wonder if restrorob has any comments regarding this conversion?
Reply With Quote
  #9  
Old 01-05-2007, 04:08 PM
MowerMedic77's Avatar
MowerMedic77 MowerMedic77 is offline
LawnSite Bronze Member
 
Join Date: Jul 2005
Location: In the shop breaking stuff....
Posts: 1,161
The only difference between the 23 and the 25 that I am aware of is the carb.
The jets will be different in the 25 and also the throttle shaft opens further on a 25 hp carb. The only exception to the jetting is for higher elevations commonly between 3000-6000ft. Since Kawi has never made a short block your only option is to rebuild or replace, if you are not doing the work yourself I would not rebuild. Hope this helps.
__________________
Remember that the quality of your question directly affects the quality of your answer. Read here to learn more http://www.lawnsite.com/showthread.php?t=144040

Life is an unrelenting comedy. Therein lies the tragedy of it.

How can I soar like an eagle, when I'm surrounded by turkeys?
Reply With Quote
  #10  
Old 01-06-2007, 12:40 PM
Accu-cut Lawn Care's Avatar
Accu-cut Lawn Care Accu-cut Lawn Care is offline
LawnSite Bronze Member
 
Join Date: Jul 2006
Location: Chattanooga, TN
Posts: 1,206
Quote:
Originally Posted by MowerMedic77 View Post
The only difference between the 23 and the 25 that I am aware of is the carb.
The jets will be different in the 25 and also the throttle shaft opens further on a 25 hp carb. The only exception to the jetting is for higher elevations commonly between 3000-6000ft. Since Kawi has never made a short block your only option is to rebuild or replace, if you are not doing the work yourself I would not rebuild. Hope this helps.
I don't really understand your post. The engine does not need to be rebuilt and I do not need a shortblock...I simply want know if replacing the carb with a 25hp version will give me more power.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 10:37 PM.

Page generated in 0.07824 seconds with 7 queries