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Engine help

Discussion in 'Mechanic and Repair' started by Natural Impressions, Apr 30, 2006.

  1. Natural Impressions

    Natural Impressions LawnSite Member
    Messages: 171

    :confused: :confused: I have 2 bobcat mowers, 36" & 48" both with a kawasaki fb460v eninge 12.5 hp. I was servicing the enginge myself because I was having problem with the carb on the 48". I pulled the carb off and blew out the whole assembly with air, changed spark plug and oil with filter and reassembled and now runs even better then when I got the eninge. So I figuired I would do the same to the 36" ( even know I didnt have much problem with it). Well the idle is all messed up. When I start the 36" with choke at full it starts right up and sounds ok. When I put throttle all the way down, still idle doesn't sound bad. But when I try to put the throttle up it revs up and down choke opens and closes and then it stalls. I seems like the engine is starving for gas. Did I completely clog up the carb? Should I pull the carb off the carb assemlby, open that up and clean it out? I don't want to go any further and creat more damage until someone possibly give me a little info on this. I would really appreciate anyone help. Thanks:drinkup:
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    I would suggest removing the carb. and do a complete tear-down and clean with a spray type carb. & choke cleaner making sure to spray through all passages and jets paying attention to number 26, Then blow through all passages and re-assemble.

    FB460 Carb. break-down.JPG
     
  3. Natural Impressions

    Natural Impressions LawnSite Member
    Messages: 171

    thanks for the advice
     
  4. Natural Impressions

    Natural Impressions LawnSite Member
    Messages: 171

    I just pulled the carb apart blew everything out clean and yes it did seem that the main jet was clogged. I put everythign back together and it is running better. Thank you. I do have one other thing now. When I open the pilot screw the mower is running fine but as is runs the pilot screw slowly closes itself causing the idle to rum bad. Is there a way to fix this? I really appreciate your help.
     
  5. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Stretch the spring on the pilot screw so it will put more tension on it.
     
  6. Natural Impressions

    Natural Impressions LawnSite Member
    Messages: 171

    Thanks.....I will have to purchase a spring because there isn't one. Thanks again
     

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