Since '02 xBhp is different things to different people. From a close knit national community of bikers to India's only motorcycling lifestyle magazine and a place to make like-minded biker friends. Join us

Axor
Magazine
Castrol Power 1

Practice slow-speed riding.

Our Partner

Announcement

Collapse
No announcement yet.

BBR Rev Box on my Honda Unicorn

Collapse
X
Collapse
 
  • Page of 2
  • Filter
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
  • #16
    @pranav- take my advice, i too first replaced my main jet with a bigger one when i got the K&N installed around 2.5 yrs back..it would sputter like anything and there was a lot of power loss at higher revs..then i put in the stock main jet and instead went for a bigger pilot jet and tuned the carb..It was then that i reaped the actual fruits of modifications..So go for a 40 number pilot jet and re-tune the carb with the stock main jet..you won't be disappointed and the power delivery would be great..the bigger main jet would be required if and when you wish to go for something like the rev box.

    @rachit- looking forward..
    If U haven't Seen GOD, U haven't gone fast enough

    Comment

    • #17
      Jetting means upjetting your mains, the pilot jet upjetting is not all required (to change in most cases), if u had sputtering when changed to a bigger jet that means u are rich, jetting is not like change one main jet and go on, we have to play around with different main jet sizes and in according keep an eye on the plug reading too.

      If u are running with stock mains with the free flow filter that means you AFR is not matched and you are running dangerouslly lean, at any point of time you can burn up your valves and rings.

      Any changes made in intake and exhaust needs upjetting.
      "Engine tuning is not an exact science, but with some practice and patience you'll get comfortable with your skill and be able tune for any conditions mother nature throws at you"


      Still the Boss -- RX 135

      Comment

      • #18
        Originally posted by psycho 98 View Post
        Jetting means upjetting your mains, the pilot jet upjetting is not all required (to change in most cases), if u had sputtering when changed to a bigger jet that means u are rich, jetting is not like change one main jet and go on, we have to play around with different main jet sizes and in according keep an eye on the plug reading too.

        If u are running with stock mains with the free flow filter that means you AFR is not matched and you are running dangerouslly lean, at any point of time you can burn up your valves and rings.

        Any changes made in intake and exhaust needs upjetting.
        I disagree with you my friend..Although we are going OT, but whatever I advised was from personal experience with my Unicorn..Upjetting doesn't come with a dictionary definition of replacing only the main jet..Also each jet has its own usage. function and time during which it remains active..AFR is affected by the slightest change, a knick here and there can either get a perfect one or make it impossible to achieve the perfect mixture..This is a very long topic in itself regarding the jets..So if you get a chance, do read about it on the internet.
        If U haven't Seen GOD, U haven't gone fast enough

        Comment

        • #19
          Each has its own usage true very true, both jets kicks in at two different stages
          at certain throttle position each jet comes into play, in a four stroke the main jet kicks in at half throttle position whereas the pilot controls the idle circuit and it comes in to action from zero to one quarter throttle position.

          So please do tell me how do u say that by only upjetting the pilots the jetting is done ?

          And if i am not wrong you were the guy who had a two stroke expansion chamber on your unicorn right ??

          And i dont need to learn the jetting part on the net, i have experienced it the hardway the practical way ..
          Last edited by psycho 98; 09-30-2010, 05:35 PM.
          "Engine tuning is not an exact science, but with some practice and patience you'll get comfortable with your skill and be able tune for any conditions mother nature throws at you"


          Still the Boss -- RX 135

          Comment

          • #20
            Originally posted by psycho 98 View Post
            Each has its own usage true very true, both jets kicks in at two different stages
            at certain throttle position each jet comes into play, in a four stroke the main jet kicks in at half throttle position whereas the pilot controls the idle circuit and it comes in to action from zero to one quarter throttle position.
            The throttle position funda is not true completely..In a simple analogy, think of the carb as a river having two streams, one big and one small..Even though the wider stream is at full flow, the smaller stream which has a richer configuration flows at all times while the bigger stream flows conditionally..Hence the mixture remained perfect when I replaced only the pilot jet..Also another point worth noting is that the engine requires a slightly leaner mixture at higher revs than what it requires at lower revs..I hope you get what I'm trying to say..
            If U haven't Seen GOD, U haven't gone fast enough

            Comment

            • #21
              If the throttle position funda is wrong then i think the guys who write such articles are what ?? Four-Stroke Carburetor Jetting Tricks on 4Strokes.com

              You need to first understand how does a carburettor work and whats the role of the emulsion tube, needle, floats, main and pilot jets play in a carburretor, you are comparing the carburation to a water stream LOL.

              What ever you claim here regards upjet i would take it with a pinch of salt !! i just bumped into this thread coz u were suggesting the same pilot upjet for others too, may be coz most of them donno that this gyaan is coming from a guy who was running a two stroke chamber on his unicorn, and for the sake of good for this community please dont give such misleading info.

              If u still disagree please back up your two streams funda with some proof.
              "Engine tuning is not an exact science, but with some practice and patience you'll get comfortable with your skill and be able tune for any conditions mother nature throws at you"


              Still the Boss -- RX 135

              Comment

              • #22
                @psycho- With all due respect, I urge you to not go Off the topic...I can only ask you not to copy and paste..Please don't question the credibility of my experience..When you open up a carb and observe,you will know what i was talking about
                If U haven't Seen GOD, U haven't gone fast enough

                Comment

                • #23
                  Copy paste me hmm ok , why dont u give a solid proof for your statements made ??

                  Regards opening up carbs i have been there doing that atleast i understand that i shouldnt use the two stroke expansion chamber for a four stroke.

                  I am out of here, please continue with your box discussion ..
                  "Engine tuning is not an exact science, but with some practice and patience you'll get comfortable with your skill and be able tune for any conditions mother nature throws at you"


                  Still the Boss -- RX 135

                  Comment

                  • #24
                    Plonk in 15T front and try ur luck of improved torque and let us know. Here gearing will be much taller than what u have now.

                    And regarding speeds u claimed, if possible please post a video from starting ur bike till u hit 115 or 135 in 5th gear.

                    Comment

                    • #25
                      The current gearing is already taller than stock..Wouldn't want to reduce the acceleration ..Regarding the video, will try to get my hands on a mountable camera..
                      If U haven't Seen GOD, U haven't gone fast enough

                      Comment

                      • #26
                        Originally posted by shubhanker View Post
                        The current gearing is already taller than stock..Wouldn't want to reduce the acceleration ..Regarding the video, will try to get my hands on a mountable camera..
                        Bro, I had used 14/38 combo also 15/38 combo. 14/38 combo is like using 15/41 combo against the stock 15/42 (pre alloy wheel versions). I never noticed any difference.

                        But regaring top speed, nothing would match 15/38 combo but the taken to reach that was like decades. There wasn't enough torque.

                        Also if u ve a GPS handset then try to check actual top speed with GPS

                        Comment

                        • #27
                          @shreeni- Just my opinion, no use of the top speed if you can't ride happily in the city with the taller gearing..I will try getting my hands on the equipment but can't guarantee a time limit
                          If U haven't Seen GOD, U haven't gone fast enough

                          Comment

                          Previous 1 2 template Next
                          Working...
                          X
                          © xBhp.com 2026. All rights reserved.
                          Designed by xBhp