Kawasaki FH451V Carb Pilot Jet Question

Discussion in 'Mechanic and Repair' started by snuddenstang, Feb 28, 2013.

  1. snuddenstang

    snuddenstang LawnSite Member
    from nj
    Posts: 56

    Is the pilot jet on this cab part #92064 in the diagram supposed to be clear all the way through? I cannot get a piece of wire all the way through it but looking at it, I am not sure if is supposed to go all the way through.
    If it is supposed to be open all the way through, it seems it would be pulling unfiltered air into the carb.
    The engine runs good with the choke on, if I turn the choke off, I need to back out this pilot jet 1/4 turn for it to run with the choke off as if it is not getting the air it needs. I am sure this jet is not made to not be seated all the way.
    I am not to familiar with this type of pilot jet being on the outside of the carb as I mainly work on motorcycles.

    Screen Shot 2013-02-28 at 8.21.26 PM.jpg
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    This pilot jet is not supposed to be open all the way though to where the screwdriver slot is, There's two holes cross drilled near the end below the threads. Make sure their open. In the very tip is a small port that clogs, Use a bristle from a steel hand wire brush to poke through this port. Just bend a bristle out to the side of the handle then work it into the port in the tip.....

    This jet should be tight in the carb body.....
     
  3. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    aYou are correct in the fact that the port in the end of the pilot jet does not pass all the way through--only as far as the two(normally) ports perpendicular to the port in the end. The function of the pilot jet is to meter air to the idle circuit. It should be firmly seated.

    Your likely problem is main jet or fuel nozzle obstruction--time for a tear down and clean up. Remove the main jet then the fuel nozzle and with a torch tip cleaner, clean all ports.

    Rob, you and Slapper are making it tough on the old man--ya beat me to the prize again.
     
    Last edited: Feb 28, 2013
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Sorry Dutch...... Ah, When ya log on next time..... Shoot me a PM say'n "I'M HERE" !!!!!

    I'll give ya an hour to make yer rounds..... ;)
     
  5. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    Correct me if Im wrong...Im sure you will...
    Isnt the pilot jet also known as the intermediate fuel jet.???
    I was under the impression that its purpose was to smooth the transition between idle an WOT by adding a slight amount of fuel directly into the venturi....Kinda like a dampner...
     
  6. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    Well, Slapper, I have been under the assumption that it was air flow/control only--don't think any fuel passes through the pilot jet. Of course, I've been wrong before and I will be again, most likely. I'll have to do a little scratchin'.
     
  7. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    There's a bunch of carb info running around in my head...occasionally they get mixed up..:dizzy:
    After playin with carbs and carb cleaner for over 30 years....I guess that's bout normal....
    Soooooo......I guess you're right....again...:laugh:
     
  8. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    I'm not sayin' I'm right, Slapper--it's just what I remember from the past. There are a few things which stick in my mind, it's possible that this isn't one of them/

    I'll defer to the Robster or one of the Council of Elders--maybe they will check in and clean up the platter.
     
  9. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Dang guys...... Guess the "grand poo-bah" is gonna have to mop up the mess..... :weightlifter:


    [​IMG]
     
  10. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    That's why they pay you the big bux.....
    Thank you .....GrandPooBaaaaaaaaa......
     

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