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KTM 250 - 300 Jetting

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  • #46
    Probably rich


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    "When you face that knarly lookin hill, stare at it study it & conquer it"



    Home Loans & Bike Finance for DBW users PM JB for details
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    • #47
      Originally posted by JJBKTM300 View Post
      Probably rich


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      Agree, sounds like it.

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      • #48
        Well it's official, 4 pages onhow to change to a leaner pilot jet.

        It is slightly frustrating that my local mechanic (not ktm) said I would be able to tune a 40 pilot out to a 38 with the A/S.
        With a 38 pilot installed, AS 1 3/4 it is pretty good, this is now back to having the necw 3rd clip which was not really ridable before, the necj i have ordered may be to skinny. I am surprised at the effect of a 38 compared to a 40 pj.

        So the problem would have been a rich idle circuit, compensated by 2nd clip on the needle producing a rich/lean situatiion (enter PHD in jetting here).

        It is still slightly spluttery which i think may be more misfire due to the poor efficiency of the squish design, it must be around 1.8, I haven't measured it. Or the necj would make it perfect, I will install and see.

        It's great having a supportive community, I appreciate everyone's input thanks again.
        Last edited by hindenburg; 3 weeks ago.

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        • #49
          Mine rips with necj.

          The jd red is not far away from necj either i believe there is also a yamaha needle ya can get thats double not triple taper like necj cant remember the number ne3j i think.
          I found nr8h was way out as was n1ei


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          "When you face that knarly lookin hill, stare at it study it & conquer it"



          Home Loans & Bike Finance for DBW users PM JB for details
          (29yrs in the game)

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          • #50
            Ok sweet, I am looking forward to trying it. Thanks JJ

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            • #51
              Originally posted by axel View Post
              Well yes. Lower PV flap is a lower exhaust port. We are talking 0.5mm here which is SFA.
              Lower exhaust port would mean loss of top end IF the flap doesn't raise it's full height.
              There would be a limit to how low a port should be for bottom end before all it's doing is simply restricting the exhaust from escaping
              But again, 0.5mm isn't really going to bother anyone. As long as it stays away from the piston ....
              I'd be moving on from the PV being related here. I think still mixture based issue. Air and fuel.
              not true the PV will still open the whole way, the PV adjustment is the start point its not the end point PV will always fully open
              Total Entertainment 14 250, STIC powered, KYB suspended.
              Huskly lovin bike whore

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              • #52
                300s always go down one size on the pilot and needle diameter from a 250, your /A/S its too far out making it leaner because you are using W needle which is richer at idle, if you use a NECJ try A/S at 1.5 turns out the carbs are designed for a ideal setting of 1.5 turn out on the A/S, got that tip from nutty.

                if your runing a 38mm carb my bet is NEDJ which is a half clip richer will give you some extra power around the mid but you may need to drop one on the main, 36mm carbs use 38P/ NECJ needles clip 3 and 165-168 mains, 38mm are larger and require richer set up and the needle works to aroud 3/4 throttle.
                Total Entertainment 14 250, STIC powered, KYB suspended.
                Huskly lovin bike whore

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                • #53
                  I was wanting a NEDJ aswell, but they had to come from Japan from my dealer, NECJ were ex East.
                  Would I drop the main to a 168 with the nedj? And would the 170 work with necj.

                  I have a rk tek head to try so will probably need to readjust the jetting to suit.

                  Sat ride, ran well enough. Will have a play with these other jets and should be good to go, back to liking this bike and will follow through with my plan, to hold onto the last of the carb KTMs, unfortunately they need quite a bit of playing with to get them to how they should come of the floor. You could definalty pick up some lazy riding traits with the 300cc!

                  cheers
                  Last edited by hindenburg; 3 weeks ago.

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                  • #54
                    Any ideas on these vertical lines on the cylinder? I am not overly concerned just curious, cant feel them as they are not score marks. I removed head to check squish and install new head.
                    Attached Files
                    Last edited by hindenburg; 2 weeks ago.

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                    • #55
                      Possible scratches from piston but not deep enough to feel with skin id put thin plastic like cigarette outer and feel it then youll know

                      Also razor blade if it gets caught on scratch send for re plate.


                      Sent from my iPhone using Tapatalk
                      "When you face that knarly lookin hill, stare at it study it & conquer it"



                      Home Loans & Bike Finance for DBW users PM JB for details
                      (29yrs in the game)

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                      • #56
                        pretty sure they're a regular thing with new bikes from the factory. Don't worry about them.IMO
                        Steve
                        Ariel MCC
                        Covering SA in singletrack since 1928
                        09 KTM300EXC-E
                        89 KTM125EXC

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                        • #57
                          Agreed. Finger nail test. If you can't feel it your piston won't care. It's all good. I have those marks too.

                          A good tip is to look and feel real close at the narrow sections between the main port and the sub exhaust. Also between the main port and that little drilled hole. Looking for loss of plating and signs of discolouration. Feel for low spots etc. If all good here it will likely be fine everywhere else.

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                          • #58
                            Cheers guys. With some brake clean on a rag it would lesson the marks making me think it is probably from the teflon coating on the new piston. Defiantly not going to over think it any way

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