2017 EXC 2 Stroke Jetting (Mikuni TMX) - Page 94

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Thread: 2017 EXC 2 Stroke Jetting (Mikuni TMX)

  1. #931
    The "Moto" steveman's Avatar
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    Quote Originally Posted by stumo View Post
    Ozzy's settings are spot on, don't know why people are having problems.
    If they are working fine thats good. Please dont get me wrong I dont criticise, why should I. I just scrutinise something I dont understand. And I really tried hard to find out but I am totally lost.

    What puzzles me most and since months is the fact that a 40PJ was way too rich on three bikes we tried to jet but it obviously works for you guys. We tried that setting at an altitude of 600ft ( between 8 and 19 degrees) and it was too rich and only just better at 8 degrees. So either it has to do with you guys being close to sea level or it has to do with air humidity.

    As I got the Keihin got tuned well finally I could close the matter for me personally. But I am still very interested to get the Mikuni right on a mates bike and it seems that KTM has found something or why would they sell a kit wit very small pilot jets? As Pete said, the PJ cant be compensated by using a "fatter" needle. And, just as a side note, the needles in the kit (xx-75) are thicker than those delivered with the bike and therefore leaner.
    Though the carburation can be richer as the needle jet (s4) has a bigger inner diameter as far as I know.

    I am curious how bikes with the KTM kit will run, time will tell.
    Al Ranger likes this.

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  3. #932
    The "Moto" stumo's Avatar
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    it's interesting that JD, KTM and Eurotek have all gone with smaller Pilot jets and compensated by the needle.
    13 250exc, 14xc head, 38pilot, n8rh clip2 with 0.2mm shim, 168 main.... '17 300 exc, 42.5pilot, 450 main, 43-73 needle, clip2 with a 0.1mm shim.......shims from Vario-helicopters UK, 90840 is 0.3mm, 90830 is 0.2mm and 90820 is 0.1mm
    Picnic? I prefer KFC; A bit of leg, a bit of breast, and a greasy box to put your bone in.

  4. #933
    Fetus Moto mankra's Avatar
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    Idle Jet is only for idle

    In real life, the idlejet is only for the rolling time and a Little bit at the first degrees of throttle, mixed with the upper part of the needle.

    Now this rolling time and first mm throttle will be leaner, at Little mor throttle (1/8 and above) it will be richer with the bigger needleJet.

    With the xx-75 needle, which is only at the beginning thicker (At middle and down, all needles are equal), it get more Progression from leaner idle to reacher mid throttle.

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  6. #934
    The "Moto" Pindie's Avatar
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    Quote Originally Posted by stumo View Post
    it's interesting that JD, KTM and Eurotek have all gone with smaller Pilot jets and compensated by the needle.
    I know mines a totally different bike and carb but this is what I found. My 200 would not work right at all with the 40/42 pilots as was suggested to me, it was just messy and dull. 35 proved to edgy and whilst could be got right with using the AS it needed regular adjustments. The 38 was spot on though and only needs a turn for change of location, summer or heavy rain.

    Getting the pilot right highlighted the needle issues more clearly as I also removed the main jet completely (this helps rule out any misleading feel from the main jet overlap- get to where the main takes over and the bike just goes blurgh). I found that only one needle gave me the right feel and was also clean but torquey and worked from pilot up to the main jet influence smoothly. Once this was sorted I then added the main jet and just worked on that area alone, again I ended up with one at least two steps away from the supposed norm.

    This seems like a lot of messing about but isolation of each jetting area helps ID what bit is off and nothing is masked by another throttle region. I therefore can see how KTM ended up with a very different base setting- remember it is only a base setting though and it still needs personalising for you, your use, weather and location.
    stumo likes this.
    This is all I can see when I open the throttle:

    https://youtu.be/VtBLqkh5u8k

    Keep out the way!

  7. #935
    The "Moto"
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    Been out on mine today. Very happy now. In terms of the power Im on ozzy's jetting (although i have a 250) and I put the gearing back to std. 13/50. I left the yellow pv spring in but wound out flush. It performs great now, and I can actually use second on technical climbs. On the road in traffic and at small part throttle it feels rich. Bit of burbling and it sounds a bit choked up. I think I could go from a 40 pilot down to a 37.5 but it really isnt a problem. At race speeds its not noticable.

    All id say is the map switch is useless. Ive had a ktm 2009 200xc, a '14 berg 250 2t & a '16 husky 2502t. All have had map switches on and all made a very noticable difference to the power. Two of those 3 bikes went on the dyno and it really did make a difference. But I literally cant tell whiich is which on this. Both feel like full power mode. The bike is very quick, and super smooth. Its not a major problem but its a bit of a shame
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  8. #936
    The "Moto" Pindie's Avatar
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    If the map switch isn't working it's either not working/connected or the jetting is still off and it won't make any significant difference
    This is all I can see when I open the throttle:

    https://youtu.be/VtBLqkh5u8k

    Keep out the way!

  9. #937
    The "Moto" ktm450awyeah's Avatar
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    Quote Originally Posted by rich16 View Post
    Been out on mine today. Very happy now. In terms of the power Im on ozzy's jetting (although i have a 250) and I put the gearing back to std. 13/50. I left the yellow pv spring in but wound out flush. It performs great now, and I can actually use second on technical climbs. On the road in traffic and at small part throttle it feels rich. Bit of burbling and it sounds a bit choked up. I think I could go from a 40 pilot down to a 37.5 but it really isnt a problem. At race speeds its not noticable.

    All id say is the map switch is useless. Ive had a ktm 2009 200xc, a '14 berg 250 2t & a '16 husky 2502t. All have had map switches on and all made a very noticable difference to the power. Two of those 3 bikes went on the dyno and it really did make a difference. But I literally cant tell whiich is which on this. Both feel like full power mode. The bike is very quick, and super smooth. Its not a major problem but its a bit of a shame
    If you want more bang put a 45 pilot in
    You should play with it till you find your sweet spot because it behaves differently
    82 Rm 125 83 Rm 250 84 Cr 500 88 Rm 250 89 Cr 250 91 Cr 250 98 kx 250 99 kx 250 2000 Cr 250 2001 Yz 250 2002 ktm 200 2003 ktm 200 2004 ktm 450 2006 ktm 450 2008 ktm 450 2009 husaberg Fi 450 2013 husaberg 300 now N8RH needle clip 2 with .2mm shim 168 main 38 pilot AS 1.5 turns out[ 2015 ktm 300 N8RG needle clip 2 38 pilot 170 main AS 1.75 out 2016 300 N8RG needle clip 2 40 pilot 170 main AS 1.75 out
    [2017 300 needle 43-74. Clip 2 .1shim pilot 42.5 main 460 crisp and sweet[

  10. #938
    The "Moto"
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    Quote Originally Posted by ktm450awyeah View Post
    If you want more bang put a 45 pilot in
    You should play with it till you find your sweet spot because it behaves differently
    It feels quite rich with a 40 in? My instincts would be go down not up. I have tong Sunday and as I've been out for a few hours today I want to just leave it how it was today but after I'll play about with it. It runs great though I certainatly don't feel like going out and spending 500 quid on a lectron for the sake of some fine tuning
    ktm450awyeah likes this.
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  11. #939
    The "Moto" ktm450awyeah's Avatar
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    I've nothing against the lectrons but I haven't found this carb difficult at all
    It'll be cold this weekend you should be fine, good luck I'm going to watch so will look out for you, what no are you ?
    rich16 likes this.
    82 Rm 125 83 Rm 250 84 Cr 500 88 Rm 250 89 Cr 250 91 Cr 250 98 kx 250 99 kx 250 2000 Cr 250 2001 Yz 250 2002 ktm 200 2003 ktm 200 2004 ktm 450 2006 ktm 450 2008 ktm 450 2009 husaberg Fi 450 2013 husaberg 300 now N8RH needle clip 2 with .2mm shim 168 main 38 pilot AS 1.5 turns out[ 2015 ktm 300 N8RG needle clip 2 38 pilot 170 main AS 1.75 out 2016 300 N8RG needle clip 2 40 pilot 170 main AS 1.75 out
    [2017 300 needle 43-74. Clip 2 .1shim pilot 42.5 main 460 crisp and sweet[

  12. #940
    The "Moto"
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    Quote Originally Posted by ktm450awyeah View Post
    I've nothing against the lectrons but I haven't found this carb difficult at all
    It'll be cold this weekend you should be fine, good luck I'm going to watch so will look out for you, what no are you ?
    No idea yet but it's a 17 six days in sportsman. I'm not fit or feeling good so will most probably be on my arse
    Al Ranger likes this.
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