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Converting 19hp Kaw 601v to a 25hp

Discussion in 'Mechanic and Repair' started by maxrep12, Apr 11, 2008.

  1. maxrep12

    maxrep12 LawnSite Member
    Messages: 18

    I purchased a new Wright Stander 19hp Kawasaki 601V. There was an out of state deal on this brand new unit that I couldn't pass up. My dilema is that I need 25hp.

    From a reliable source I was told that the 19 - 21 - 23 - 25 hp models are identical with the exception of the carburation jetting. I phoned Kawasaki. Too say they were tight lipped was an understatement.

    Has anyone made this jetting conversion? I was also thinking about putting on the canister filter upgrade.
  2. Happy Frog

    Happy Frog LawnSite Bronze Member
    Messages: 1,224

    There is a difference in the carb butterfly opening.
    The easiest and most reliable way to do this is to buy a new 25 HP carb.
    The hard way is to grind to butterfly stop in the carb venturi. I am not sure you actually have to change the jets. They may be the same.
  3. maxrep12

    maxrep12 LawnSite Member
    Messages: 18

    Thanks for the reply. I'm all for simplicity, so getting a 25 hp carb sounds fine. Is there a web site you might recommend for the item?
  4. jkason

    jkason LawnSite Senior Member
    Messages: 546

    When you put the canister-style air filter on you need to change out the jets also.
    Just something to be aware of.
  5. Mic_bug

    Mic_bug LawnSite Member
    from N.B. MI
    Messages: 201

    buy the 25 HP carb and swap them
  6. Jay Ray

    Jay Ray LawnSite Fanatic
    Messages: 6,510

    Kohler used to have identical engines with different hp, and the way they did it was a higher compression ratio for the higher hp, that is, the higher hp had the head milled a little more right from the factory. For me it is hard to believe that a change in carburetion alone can yield a 32% increase in hp, but I'm no expert, just skeptical. But if it will, that is fantastic to know.
  7. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Messages: 963

    I'm even more skeptical about the same engine having more torque by putting on a bigger carb.
  8. LarryF

    LarryF LawnSite Bronze Member
    Messages: 1,181

    That's my opinion too. "If it sounds too good to be true.............etc." And if you do change the carburetor, I have to wonder if you will test or even be capable of testing the result to confirm that you really do get up to 25HP. I have an idea you'll be wasting both your time and money if you try this.
  9. rjxj

    rjxj LawnSite Member
    Messages: 80

    It seems very unlikely that you can get that much hp with a carb change. I will check it out at work on Monday. I know there are at least three different head gaskets available with different diameters, so there must be different bores.
  10. Happy Frog

    Happy Frog LawnSite Bronze Member
    Messages: 1,224

    This issue as been discussed at length on this forum. Just do a search and you'll find a few treads about this.
    The only difference in parts numbers on the Kaws 19-25 HP is the carburetor.
    If you are unsure, check the parts numbers yourself is the parts catalog for these engines.

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