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kawasaki 15 trouble

Discussion in 'Mechanic and Repair' started by arosewag, Apr 23, 2006.

  1. arosewag

    arosewag LawnSite Member
    Messages: 45

    I have an exmark 48 hydro walk behind. Not very many hours on it. I can't seem to get full hp out of the engine. Not sure what happened, but at full throtle it seems to be at maybe 2/3 power. Really bogs down. I thought it may be the plugs, but I changed them and it still does the same thing. It starts up fine, idles fine, doesn't make any strange noises. I checked the linkage and there is full travel in the throttle. Any ideas?
  2. lucforce

    lucforce LawnSite Member
    Messages: 223

    You need to get access to a tachometer and verify the top no load rpm's. Check the air filter also.
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    If you post the model and spec. numbers off the engine I will post the high speed adjustment procedure, But as lucforce said you need a tach. to set it properly. You can order one here; http://www.tinytach.com/tinytach/gasoline.php Or purchase the same one at any Briggs & Stratton dealership.
  4. 6'7 330

    6'7 330 LawnSite Bronze Member
    Messages: 1,821

    Get a tach and see what the rpms are.It is an easy procedure to adjust the RPMS,if it is a V-Twin 15.Under the air cleaner houseing, there is plate,loosen two 10 mm bolts on each side of the plate, take a long screw driver or wrench, and lift up on the plate to raise the RPMS.We put tach's on all the walkbehinds, and Z-Turns. If the air filter and RPMS are ok, it could be a coil going bad, or the thottle linkage messed up.
  5. Mowingman

    Mowingman LawnSite Platinum Member
    from Texas
    Messages: 4,702

    If it is the v twin, I would guess it is likely you have one coil going bad.
  6. arosewag

    arosewag LawnSite Member
    Messages: 45

    Thanks for the replies guys. Restrorob....can I get just the standard tach? Also, I found an earlier reply of yours to another post that had the schematic for the linkage. I'm going to check and make sure the choke linkage is ok. The diagram will be most helpful, thanks. I did check the air filter and it was certainly dusty. I banged out as much of the soot as I could, but it doesnt seem to be the problem. I started it up without the filter and it doesn't affect the rpms.
  7. arosewag

    arosewag LawnSite Member
    Messages: 45

    Is there a good online parts supply for coils? Are they easy to replace? I am mechanically inclined and not afraid to take something apart.....only sometimes do I have parts left over after putting it back together.
  8. oldrustycars

    oldrustycars LawnSite Senior Member
    Messages: 301

    you guts should listen to Restrorob. you can get the Briggs vibratach for about 15 bucks, they work great, and reasonably accurate. its all ive ever used. but on a machine you make your living with, get that tinytach and you get an hour meter as well. installs in seconds, just wrap the wire around the spark plug lead. now you can watch the rpm's all the time, and maybe adjust the ground speed accordingly. plus the hour meter...you might be surprised how many service intervals you've missed.
  9. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Well I need your model numbers to look it up because there are a couple different 15's and I don't want to misinform you. changing a coil is not that hard of a job but I don't know of a on-line place to get them for Kaw. right off hand. Any tach. will do but the tiny tack is the best bang for the buck as oldrustycars said.
  10. lucforce

    lucforce LawnSite Member
    Messages: 223

    "It starts up fine, idles fine, doesn't make any strange noises."

    Before you start ordering pricey ignition coils, I would verify the rpm's if the above is still true.

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