14 To 17 Hp Motor Swap

Discussion in 'Mechanic and Repair' started by bobby perez, Jun 8, 2007.

  1. bobby perez

    bobby perez LawnSite Member
    Posts: 86

    14 to 17 hp engine swap scag

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    good evening fellas , I just purchased a 17hp Kawasaki engine for the scag hydro.which had a 14 kawi,. the mower has an electric clutch. the problem is the wiring ,I cant figure it out.The NEW engine has 2 wires coming from it, 1 ,I believe is for the clutch the other for the engine stop switch.The terminal ends on these wires coming from the engine are a blade terminal and a round or barrel type terminal on the other wire. Now, the main problem is, that the wires coming from the mower is a 3 bladed terminal harness and the harness that connects the clutch to the mower power source is a 2 bladed terminal harness.I am confused as to hook up what, where. I can connect the clutch harness to the mower, but then what. please if you can shed a little info I would be deeply indebted to you. Before I get WIRED UP. I did do a search but to no avail. Also anything I should watch out for. I did get the clutch and pulley of with no problem off the old one. THANK YOU MUCH. PS This thread is also on the mechanic forum thought I'd put it here also for greater visibility
     
  2. Texas Mower Parts

    Texas Mower Parts LawnSite Senior Member
    from Texas
    Posts: 472

    Are you sure that your new engine has a coil to run your electric clutch. What is the model number? ex: FH500V-AS02
    -Travis
     
  3. bobby perez

    bobby perez LawnSite Member
    Posts: 86

    yes well almost its fh500v-cso2, according to the wiring diagram it has 2 wires 1 for the engine stop switch the other for the clutch. It does have a charging coil. THANKS I need a little guidance on what to do with this info.
     
  4. bobby perez

    bobby perez LawnSite Member
    Posts: 86

    I Mean its a FH50V-CSO2-S Thats whats on the box
     
  5. bobby perez

    bobby perez LawnSite Member
    Posts: 86

    DARN !@#$ %Typo FH500V-CSO2-S
     
  6. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    You need to answer a few questions;

    What colors are the wires on the new engine ?

    The old engine was plugged into a voltage regulator mounted on the frame of the mower correct ?

    Post the model and serial numbers off your Scag so I can give the wire diagram a quick gander before making any suggestions, I need to verify one wire.
     
  7. bobby perez

    bobby perez LawnSite Member
    Posts: 86

    Yes the old engine was a fc 420v -HS09 kawi and it did plug nto a 3 bladed terminal harness on the mower deck. The clutch also plugged in off the mower deckwith a 2 bladed terminal harness.The mower is a Scag SWZ48KA Serial#3250284 The new engines wires are red with a female blade terminal which I believe is for the clutch, and the other is black with a barrel type terminal on the end which might be or probably is the engine stop.However I don,t know how the connections are made with the existing harnesses since they wont fit into each other.I know I probably have to splice or purchase a different harness.THANKS again for your help.
     
  8. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    OK Bobby, We have some pretty pictures here;


    [​IMG]



    [​IMG]


    The picture below shows the three wire plug connector that the old engine plugged into, There are two red wires and one white wire.
    Connect the black wire from the new engine to the white wire in this plug connector, Doing this will maintain all factory safety switch operations.

    [​IMG]

    You can get the proper wire connectors needed for splicing at any auto parts store.

    I just helped a guy with the same unit a couple weeks ago and had these pics. saved, I would have never guessed I'd use them a second time.

    Good Luck
     
  9. bobby perez

    bobby perez LawnSite Member
    Posts: 86

    Restorob :THANK YOU so much for your time and advise. Gonna give this a try. Ive seen these pictures in my search just could'nt figure out what to do with them. I assume the ground wire just bolt to engine?Again THANK YOU and if you'r ever in South Jersey give me a heads up and we'll head over to the casinos. GOD BLESS YOU and your LOVED ONES.
     
  10. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    If you are speaking of the black harness ground wire that was bolted to the rear engine mount screw, YES it must be re-connected to the same engine mount screw on the new engine. Not the black wire from the new engine.
     

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