What is the "Start Jet"?

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • 11Rider
    XStremely XSive
    • Aug 2010
    • 331
    #1

    What is the "Start Jet"?

    Hi guys, I'm reading the thread on carburetor facts and it mentions the sizes of the "start jet" in variious year models. Would this be for the enricher circuit, ie the "choke"? If so, why would it be smaller on the 79s and later models. I can't see where it would effect emissions since it's only used for a relatively short period of time.

    Also, where do you guys buy your jets from? I want to go to a 45 pilot jet. Thank you.
    '79 XS11 Special, fork gaiters, Uni pods, 45 pilots, 140 mains, ditched the octy, solo seat, T kat fork brace

    Purrs like a kitten, runs like a scalded cat
    Tags: None
    • natemoen
      Master of XSology
      • May 2010
      • 8640
      • Fargo
      #2
      Link to the thread would help. I am guessing it is just another way of saying pilot jet.

      As to the jets I found it easiest and cheapest to get them locally. Once you add in shipping it get a bit more expensive. I got my mains for just under 3 bucks each. Pilot jets were cheaper.

      Why do you want to go up on your pilots? I have a 4-1 supertrap exhaust, k&n filter in a drilled out airbox and I haven't (at least yet) went up on my pilot jets.
      Nathan
      KD9ARL

      μολὼν λαβέ

      1978 XS1100E
      K&N Filter
      #45 pilot Jet, #137.5 Main Jet
      OEM Exhaust
      ATK Fork Brace
      LED Dash lights
      Ammeter, Oil Pressure, Oil Temp, and Volt Meters
      Green Monster Coils
      SS Brake Lines
      Vision 550 Auto Tensioner

      In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

      Theodore Roosevelt

        Comment

        • 11Rider
          XStremely XSive
          • Aug 2010
          • 331
          #3
          It's in the maintenence section under "carburetors". It lists the pilot jets separately. http://www.xs11.com/forum/showthread.php?t=73

          I was going to get bigger pilot and mains. I remember my original stock '79 (back in '79) running lean so I figured with the K&Ns I better be careful. Maybe not?
          '79 XS11 Special, fork gaiters, Uni pods, 45 pilots, 140 mains, ditched the octy, solo seat, T kat fork brace

          Purrs like a kitten, runs like a scalded cat

            Comment

            • bikerphil
              Master of XSology
              • Jan 2008
              • 8634
              • South Flori-DUH
              #4
              The "start" jet is pressed into the bowl and can't be removed, just make sure it's clear.
              2H7 (79) owned since '89
              3H3 owned since '06

              "If it ain't broke, modify it"

              ☮

                Comment

                • 11Rider
                  XStremely XSive
                  • Aug 2010
                  • 331
                  #5
                  Oh, OK. I saw a passage built into the bowl so I blew some WD-40 through it and then compressed air - all clear!
                  '79 XS11 Special, fork gaiters, Uni pods, 45 pilots, 140 mains, ditched the octy, solo seat, T kat fork brace

                  Purrs like a kitten, runs like a scalded cat

                    Comment

                    • 11Rider
                      XStremely XSive
                      • Aug 2010
                      • 331
                      #6
                      Originally posted by natemoen
                      Link to the thread would help. I am guessing it is just another way of saying pilot jet.

                      As to the jets I found it easiest and cheapest to get them locally. Once you add in shipping it get a bit more expensive. I got my mains for just under 3 bucks each. Pilot jets were cheaper.

                      Why do you want to go up on your pilots? I have a 4-1 supertrap exhaust, k&n filter in a drilled out airbox and I haven't (at least yet) went up on my pilot jets.
                      Since you have a '78, you already have the pilot jet size I want to put in. I now have 42.5s in my '79.
                      '79 XS11 Special, fork gaiters, Uni pods, 45 pilots, 140 mains, ditched the octy, solo seat, T kat fork brace

                      Purrs like a kitten, runs like a scalded cat

                        Comment

                        • natemoen
                          Master of XSology
                          • May 2010
                          • 8640
                          • Fargo
                          #7
                          That is true.'78's do already have 45 pilots. Phil has the starter jet thing covered.
                          Nathan
                          KD9ARL

                          μολὼν λαβέ

                          1978 XS1100E
                          K&N Filter
                          #45 pilot Jet, #137.5 Main Jet
                          OEM Exhaust
                          ATK Fork Brace
                          LED Dash lights
                          Ammeter, Oil Pressure, Oil Temp, and Volt Meters
                          Green Monster Coils
                          SS Brake Lines
                          Vision 550 Auto Tensioner

                          In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

                          Theodore Roosevelt

                            Comment

                            • ManagerMike
                              XStremely XSive
                              • Mar 2010
                              • 445
                              • S.E. Michigan
                              #8
                              I've a 78 as well. With the custom exhaust and pod filters (and v-stacks) I upped the mains to 145's over the winter, and left the pilots at 45. Significant boost in throttle response and power without any loss of idle quality, and it stayed in sync (yes I checked it). There was no need to adjust the sync or the pilot screws. (I run with the screws about two and a half turns out).
                              If you up the pilot jets, you will almost certainly need to do some tuning afterward but I think you will be pleased with the result. I do believe Yam downsized the pilots in 79 strictly for emmissions purposes.
                              '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

                                • skids
                                  XS-XJ Super Guru
                                  • Jul 2002
                                  • 5047
                                  • Florissant, CO, USA
                                  #9
                                  Originally posted by 11Rider
                                  Oh, OK. I saw a passage built into the bowl so I blew some WD-40 through it and then compressed air - all clear!
                                  A new use for WD-40!
                                  Skids (Sid Hansen)

                                  Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.

                                    Comment

                                    Previous template Next
                                    Working...