Exmark Lazer HP Kaw 19 HP Power Problems

Discussion in 'Mechanic and Repair' started by WigginsLandscaping, Jul 12, 2007.

  1. WigginsLandscaping

    WigginsLandscaping LawnSite Member
    Posts: 103

    Exmark Lazer HP 19 HP 48" Deck

    Problem started today or I should say we noticed it today.

    When we start up the mower and push throttle to full power it seems like it is only going about half. ( This is what is sounds like anyway.) When we engage the blades it seems very slow and under powered.

    Air Filter NEW
    I checked spark plugs. One had a little carbon buildup not bad the other hardly any however it did seem to be wet. I couldn't tell if it was oil or gas.

    Throttle is mechanically opening all the way so not a linkage problem. I replaced both plugs. I did notice a little white smoke before the plugs were changed but not noticeable after plug change. Power did not increase at all with the change.

    Engine maintained regularly and I have no problems with it at all.
    598 Hours on meter. What should l look for next?
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    Loosen the plug wire boots where they can be removed easily. Start the engine and with rubber handled pliers remove each plug wire one at a time to see if the engine shuts down.

    I suspect it's only running on one cylinder (wet plug), Could be a dead coil or valve issue. Kawi Recommends checking valve adjustments every 300hrs. Has this been done ?
     
  3. WigginsLandscaping

    WigginsLandscaping LawnSite Member
    Posts: 103

    I was thinking valve problem since it had some smoke. Valves had not been adjusted. I will take to shop tomorrow and have it gone through. I am not sure how to check the valves. I have done many times on cars and trucks but never on a mower motor. I will check the coil first but since it is recommended to have the other done anyway it wont hurt to take it in. I have another just like it with a couple of walk behinds as well so I can make do for a couple days without it. Thanks....
     
  4. WigginsLandscaping

    WigginsLandscaping LawnSite Member
    Posts: 103

    Is there an online manual that would descibe the procedures for adjusting valves. If it isnt too complicated I would like to learn the process so that I can do it in the future. I do most of the maintenance on my equipment myself for time saving purposes. Thanks again.
     
  5. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    Will this work ? Not sure about the whole manual....



    [​IMG]
     
  6. WigginsLandscaping

    WigginsLandscaping LawnSite Member
    Posts: 103

    Thanks...I think we found our problem. I did the spark plug test. Sure enough we pulled one plug wire off no change...Replaced it pulled the other off. It died with a loud boom backfire. So fire problem..I am thinking. But while I am at I am thinking might as well pull the valve covers and check the valve. I pulled the left side cover off and push rod falls out. Needless to say I have a buddy coming over tonite to show me how to maintain the valves. Thanks for the help.
     
  7. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    Good deal, You may save that trip/money to the dealer.
     
  8. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Posts: 2,613

    Ignition coil on the dead cylinder is shot.
     
  9. WigginsLandscaping

    WigginsLandscaping LawnSite Member
    Posts: 103

    So you think we may have two problems???? I hope not. We'll see in a little while for sure though. Restrorob you happen to have a sheet on the coils. I cant imagine they would be a problem but wouldnt hurt to have the information on hand.
     
  10. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,022

    Evidently maniac didn't comprehend this part of your post.

    Continue with the push-rod repair and that will most likely solve your problem.

    But I do have this anyway;


    [​IMG]
     

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