Kawasaki FB460V stalls under load

Discussion in 'Mechanic and Repair' started by bgbuffalo, May 20, 2006.

  1. bgbuffalo

    bgbuffalo LawnSite Member
    from CT
    Messages: 3

    I have an older Scag 36" walk behind with FB460V Engine. Last season had trouble starting first time, but a shot of starting fluid took care of it. Now it starts rightup with a squit, but if it will stall at anything more than a high idle or under load.

    Changed fuel filter, cleaned exterior of carb to no avail I am new at this and not sure where to go from here.
  2. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Sounds like you need to clean the interior of the carb., Use a spray can of carb. & choke cleaner and spray all ports and passages including jets. If you have access to compressed air blow thru all the passages as well. Also make sure the choke valve is closing fully when the cable is moved to the choke position. You don't have to remove the throttle and choke shafts.
    Below is the carb. break-down to assist in disassembly and reassembly.

    FB460 Carb..JPG
  3. yardmanlee

    yardmanlee LawnSite Senior Member
    Messages: 898

    It could have some water trapped in the fuel system, carb cleaner should take care of that
  4. ProLawns

    ProLawns LawnSite Senior Member
    Messages: 476

    FB460's get hard to start when they have low compression. It might need a valve job. This might also explain why it doesn't have any power.
  5. bgbuffalo

    bgbuffalo LawnSite Member
    from CT
    Messages: 3

    I found some debris in a vent hole and blew that out. I drained the gas tank, blew out the fuel line and replaced with fresh fuel. I sprayed a bunch of carb cleaner into the carb while running and could get the rpms up for a few minutes, but as soon as I engaged the blade it would choke. I can engage the blade at low idle and bring the rpms up to around a high idle before it chokes.

    The butterfly seems to be working properly.

    I guess I pull the carb off, disasemble and clean, I was just hoping I would not have to pull it.
  6. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,554

    If it has a lot of usage on it you might have to look at valve job the exhaust valve gets dirty and stays partially open. I have had 2 for 2 of them with that situation. It also made the unit hard to start.
  7. Oldtimer

    Oldtimer LawnSite Bronze Member
    Messages: 1,459

    Throw the starting fluid away. The professional mechanics would not even consider using starting fluid.

  8. J&R Landscaping

    J&R Landscaping LawnSite Fanatic
    Messages: 5,095

    Carb cleaner is good to clean with. Put some gasoline in a spray bottle and sray that in the carb to get the engine to start. Carb cleaner and starting fluid dry the cylinder out a lot. Spraying straight gas or a very lean mix of 2 stroke mix is better than 2+2 or starting fluid.
  9. bgbuffalo

    bgbuffalo LawnSite Member
    from CT
    Messages: 3

    Thanks for the info. Now I see why you guys get the big bucks!:)
  10. J&R Landscaping

    J&R Landscaping LawnSite Fanatic
    Messages: 5,095

    Big bucks?? What are those and where can I get some?? :dizzy: :confused:

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