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carburetor tuning after fixing k&n airfilter

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  • #1

    carburetor tuning after fixing k&n airfilter

    hi guys i'm kinda bothered about my bike(fz16) after fixing it a new k&n air filter my self
    is that need any carburetor tuning if so gime a demo (because i'm not able to atain even 100km/hr )

    Last edited by Samarth 619; 05-18-2012, 08:42 PM.
    Tags: None
  • #2
    If its a stock replacement filter You don't need to or else You need to tune the carb. When You install the k&n filter more air will be flowing and it will make the fuel, air mixture lean and You will have trouble in cold start as well.

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    • #3
      Originally posted by kaz View Post
      hi guys i'm kinda bothered about my bike(fz16) after fixing it a new k&n air filter my self
      is that need any carburetor tuning if so gime a demo (because i'm not able to atain even 100km/hr )
      Yes you do have to tune your carb for better performance. I think the K&N filter allows more air to flow making your mixture lean.
      Try the steps beolow, i got it from the net to tune my carb.Hope it helps you.ITs better you get this done from a mech.

      very slowlyfeeling you get.

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      • #4
        Have you fixed it directly to the Carb?
        Anyway you will need to UpJet.Try a richer AFR first anyway,if not enough then upjet the MAIN JET to Unicorns 115,if not enough again to the P180's 117.5

        FZ's stock MAIN Jet is 112.5
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        • #5
          Carb tuning has to be done only by a professional, carburetor is a vital part of the bike, tampering with the air screw settings will make your bike unsafe to ride. Even many experienced mechs think twice before tuning the carb.
          Last edited by Ri$hi; 01-10-2012, 08:40 PM.

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          • #6
            To add to mpasanthosh's points, plz ensure tat the engine is thoroughly warmed up before u try setting the AFR. Ride the bike for around 5 kms for this.

            @Rishi - i accept this is a tough task but in lesser means unsafe. Most of the bikes are serviced/tuned at local mech shops n all know how experienced these mechs are. How many incidents hv u heard of due to improper tuning?

            Mastering this skill may take time but will surely come in handy
            Contribute to the environment.

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            • #7
              Originally posted by mpasanthosh View Post
              Yes you do have to tune your carb for better performance. I think the K&N filter allows more air to flow making your mixture lean.
              Try the steps beolow, i got it from the net to tune my carb.Hope it helps you.ITs better you get this done from a mech.


              very slowlyfeeling you get.

              Thanks a lot! I'm gonna try this.

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              • #8
                More info

                Hi,

                I added a K&N R 1100 to my P-135 . Yes everyone has been right about how badly one has to, has to tune the carb, as the air fuel ratio changes after installing performance air filter. I had clocked 127 kmph (when my bike was relatively new) and wish to click 135 kmph plus, hence the mods are on . With K&N added i could barely clock 113 - 117 kmph range. I have searched a hell lot online and in the streets of mumbai for a reliable mech, didnt find any. I have reached a conclusion to tune it myself.

                In the above method mentioned you didnt talk about getting bigger jet size, will just tunning(with no jet size increase) help? Also please upload snaps of the procedure to tune as well as add new jets as i want to do it myself.

                Onr question for carb experts > if i am going to ladhak this year will i have to change settings of my carb as altitude rises(thin/ less air)?

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                • #9
                  ^^^ hmm.. i dont know about the prices, but then you could rather try getting your hand on a fuel injection system to completely rid yourself of any hassles.. but initially even the fuel injection will have to be programmed to know the correct air fuel mixture in the thin air of leh ladakh.. not all fuel injections may have preset configs for optimum air fuel ratio at such heights..

                  Comment

                  • #10
                    Originally posted by Trimbak View Post
                    Hi,

                    I added a K&N R 1100 to my P-135 . Yes everyone has been right about how badly one has to, has to tune the carb, as the air fuel ratio changes after installing performance air filter. I had clocked 127 kmph (when my bike was relatively new) and wish to click 135 kmph plus, hence the mods are on . With K&N added i could barely clock 113 - 117 kmph range. I have searched a hell lot online and in the streets of mumbai for a reliable mech, didnt find any. I have reached a conclusion to tune it myself.

                    In the above method mentioned you didnt talk about getting bigger jet size, will just tunning(with no jet size increase) help? Also please upload snaps of the procedure to tune as well as add new jets as i want to do it myself.

                    Onr question for carb experts > if i am going to ladhak this year will i have to change settings of my carb as altitude rises(thin/ less air)?
                    you need to upjet it for that K&N, to get any significant benifits, its a trial and error method unless someone already know the correct jet size for your bike.

                    Originally posted by puneetritehere View Post
                    ^^^ hmm.. i dont know about the prices, but then you could rather try getting your hand on a fuel injection system to completely rid yourself of any hassles.. but initially even the fuel injection will have to be programmed to know the correct air fuel mixture in the thin air of leh ladakh.. not all fuel injections may have preset configs for optimum air fuel ratio at such heights..
                    Closed Loop FI system has a air intake (O2) sensor and adjusts automatically.

                    Open loop systems have no such sensor, and hence can't adjust itself to suit the airflow.

                    Similarly, Even Closed loop Fi systems might have a limit, like 20% more fuel possible, beyond which it will just display an engine malfunction light on the console or not work properly.
                    Last edited by Samarth 619; 05-18-2012, 08:45 PM. Reason: added/ corrected some info.
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                    • #11
                      thanks this was very helpful. i tried this, but i tried after installing a k&n , i tuned to 3000 rpm n did as suggested by xbhp, but a funny thing i found out that i had to screw 4 half rev to get the optimal mix, at first in 5 half rev the rpm got constant then i drove for a test ride, then again i screwed 1 half more rev so as to match xbhps suggestion (mentioned 3-4 ful rev) but after 3 ,4 iteration at last i got it in 4 half rev, but i heard the stock rev is 5, so its kinda fishy to me that is it really safe for me to drive with 4 half rev, since it can heat up the engine ??? plz guys i need some advice in this !!!!!

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