Announcement

Collapse
No announcement yet.

Time to re-jet - advice

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Time to re-jet - advice

    Shattered the record high today (84 degrees - Rochester, NY). Have started working on my XS400 'rat' project. I've de-badged and lowered it. Also opened up the air intake and exhaust. It was running lean but now won't stay running at all. It will start up cold with choke, but will after-fire and spit and die at low rpm. Seems worse warm/hot.

    I haven't taken a cycle carb apart in years. Where should I start with jets (has stock jets)? The bike is an 82 so I'm wondering if I should do a carb kit while I'm at it.

    Any help in getting me pointed in the right direction is appreciated.
    Tony A. Bartolucci
    Present Ride: 1982 XS400LJ Custom
    Former Rides: 1981 XS1100LH
    1975 Kawasaki 100 2 Stroke Enduro
    1975 Honda 750F

    Current Cool Cage: 1966 Chevy Impala 396

  • #2
    82 XS400 Midnight Special is it ?
    I'd clean those carbs and check to make sure your float levels are correct before you go too far with the jetting.

    I just picked up an 82 Seca XS400 today. Into the carbs at this time as well. Has sat since 1995. Carbs weren't too bad though. Gotta get a key for it tomorrow. Will post a pic then.
    Richard

    Comment


    • #3
      Carbs are off the bike

      Yanked the carbs off today. I guess there's no such thing as a carb-kit for these. Therefore, I guess the easiest route to go is adjust the floats and re-jet. I've not done this before so I'm going to search for a tutorial on the site.
      Tony A. Bartolucci
      Present Ride: 1982 XS400LJ Custom
      Former Rides: 1981 XS1100LH
      1975 Kawasaki 100 2 Stroke Enduro
      1975 Honda 750F

      Current Cool Cage: 1966 Chevy Impala 396

      Comment


      • #4
        Update

        UPDATE: I've not done this before and could use some advice. The bike is running very lean, so much so that it will hardly run at all. How many sizes larger should I go on the jets? I'm thinking two. Also, where is a good source to purchase them?

        I also need to adjust the floats (gas runs out the carbs if the petcock is left open). What is the procedure for doing this?

        Any and all help is greatly appreciated!
        Tony A. Bartolucci
        Present Ride: 1982 XS400LJ Custom
        Former Rides: 1981 XS1100LH
        1975 Kawasaki 100 2 Stroke Enduro
        1975 Honda 750F

        Current Cool Cage: 1966 Chevy Impala 396

        Comment


        • #5
          Po-boy Carb kits are available on Ebay most are only float bowl gasket and float valve. Carbkitcapital has them and they come with the float bowl gasket, float valve& seat

          Most times the valve and seat can be polished up with a Q-tip and some brass cleaner so it seats.

          They didn't have a float height measurement but 23-24mm off the gasket mounting surface(gasket removed) gets you in the ballpark. To verify the fuel level in the float bowl you need a clear tube inserted into the float bowl drain passage so it doesn't leak and open the drain screw. Hold the clear tube up along side the float bowl and the level is supposed to be 3mm below the bottom of the upper carb body +/-1mm. I checked mine on the bench in a vise hooked up to a fuel tank. Make sure they are level when you do whether its on the bike or off. Adjust the floats as needed to get the right fuel level in the bowl.

          Did you pull the jets, emulsion tubes and clean all the ports?
          Richard

          Comment


          • #6
            Don't re-jet yet. Get the carbs thoroughly cleaned first, new float valves, and floats set. Changing jets is for fine tuning an already running engine. If it won't run due to a lack of fuel, then the carbs are crapped up. Start from a baseline, then after it's running tweak the performance.
            '78 E "Stormbringer"

            Purrs like a kitten, roars like a lion, runs like a gazelle (being chased by a cheetah).

            pics http://s1209.photobucket.com/albums/...tormbringer45/

            Comment


            • #7
              No, I haven't taken the carbs apart yet. I'm confident that a re-jet is in order since 1) I made the mods of opening up the exhaust and air intake; 2) Since I did #1 the plugs are white, not tan. I'll see if I can get the bowls open on Monday.

              Thanks for the help!
              Tony A. Bartolucci
              Present Ride: 1982 XS400LJ Custom
              Former Rides: 1981 XS1100LH
              1975 Kawasaki 100 2 Stroke Enduro
              1975 Honda 750F

              Current Cool Cage: 1966 Chevy Impala 396

              Comment


              • #8
                Jetting Recommendations

                http://www.xs11.com/forum/showthread.php?t=382
                http://www.myspace.com/i_give_you_power

                1980 XS11 Special - chopped, dropped and OCTY is still installed - NOW IT'S FOR SALE! $1,800 OBO


                Famous Myspace quote:

                "Don't mess with TEXAS! It's not nice to pick on retards."

                It's funny because I am from TEXAS!

                Comment

                Working...
                X