25 hp kawi black smoke sputtering????

Discussion in 'Mechanic and Repair' started by fivestarlawnken, Aug 1, 2007.

  1. fivestarlawnken

    fivestarlawnken LawnSite Senior Member
    Posts: 438

    Need Help!!!! I have scag tiger with 25 hp kawi with 800 hours on it. Lately it has been blowing black smoke when engaging blades and reving the engine while transporting.Air cleaner is good, oil is about 40 hrs on it,I bought new plugs today. Is it poss.a carb issue??? It is also sputtering lately also. Fuel filter looks good.Any ideas???????? Thanks:dizzy: :drinkup:
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    I believe if the float valve was not shutting the fuel off properly the engine would flood while sitting/over night ?

    When was the last valve adjustment performed ? Should be done every 300 hrs. per the manual.

    Also, There are two different air filters for this engine depending upon if it has a internally vented or externally vented carb. The filters look the same but the micron rating of the paper is different. Using the wrong one or a aftermarket not identified for the proper carb could cause a rich/poor run situation.

    If your carb has a gold plate on the top held with three screws you need part # 11013-7027 air filter, With no plate on top part # 11013-7024.
     
  3. fivestarlawnken

    fivestarlawnken LawnSite Senior Member
    Posts: 438

    Thanks for the help will look into the air filter deal.I did recheck it in good light and it is dirty.Tomorrow I will buy a new one..
     
  4. johnp900

    johnp900 LawnSite Member
    Posts: 71

    Did Tigers have 25hp Kawasaki's? Is this air cooled or water cooled? At 800 hours, check for a worn throttle shaft.
     
  5. HenryB

    HenryB LawnSite Bronze Member
    Posts: 1,828

    What are the specs for a valve adjustment on a Kawasaki fh721?
     
  6. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    As Below;


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  7. HenryB

    HenryB LawnSite Bronze Member
    Posts: 1,828

    Thank you.:waving:
     

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