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Swapping Kawasaki engines 23hp to 25hp

Discussion in 'Mechanic and Repair' started by scas0130, Apr 21, 2005.

  1. scas0130

    scas0130 LawnSite Member
    from Cary NC
    Posts: 1

    I have a 52" Bobcat ZT 200 with a 23hp Kawasaki that is shot. It is a FH680V-AS05. It has a 1 1/8" shaft that is 3.94" and keyed. Can I replace this engine with a 25 hp Kawasaki with the same 1 1/8" shaft and 4 5/16" keyed shaft if I space the motor up the difference? Will the shaft be threaded the same? How about the wiring? Will the mufflers be the same? I have found a cheaper 25 hp than the 23hp.

  2. kawasakitech

    kawasakitech LawnSite Member
    Posts: 11

    I've never had anyone space the engine up to compensate for a longer PTO shaft but as far as the rest of your questions, the answer is yes it will work.
  3. Oldtimer

    Oldtimer LawnSite Bronze Member
    Posts: 1,458

    If the crankshaft is threaded deep enough and the keyway slot is in the right place you can adjust the length.

    Mark where you want to cut, install a bolt, start the engine and hold a hacksaw against the mark on the crankshaft and have patience.

    If you use spacers they need to have a contact area equal, or close to equal, to the contact area of the engine.

  4. rrobinson1

    rrobinson1 LawnSite Member
    Posts: 1

    I am curious if this swap worked. I have a ZTR 200 with the same engine FH680V-AS05 that just threw a rod after 5 years. I have had to change out the top oil seal every year as it leaked. This year it leaked all at once and the oil was thrown out before I realized it and broke a rod. Now I am looking for another engine. I may look at the 25HP or a different brand (Honda). Any reccommendations???????? Can anyone give me the current Kawasaki engine options?

  5. Oldtimer

    Oldtimer LawnSite Bronze Member
    Posts: 1,458

    A Kohler will work ok with just a few changes on the wiring ends. A new harness won't be necessary.


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