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Thread: 2016 300exc carb question

  1. #11
    The "Moto" ktm450awyeah's Avatar
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    Put the N8rh needle in clip 2 38 pilot 170/172 main
    And you've found what your looking for :-)))
    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 45 main 460 crisp and sweet[

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  3. #12
    The "Moto" steveman's Avatar
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    The 38 wouldnt make things worse? Considering its a rich condition causing the burble...

  4. #13
    The "Moto" ktm450awyeah's Avatar
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    He only thinks it's rich it isn't
    stumo 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 45 main 460 crisp and sweet[

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  6. #14
    The "Moto" stumo's Avatar
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    Quote Originally Posted by ktm450awyeah View Post
    He only thinks it's rich it isn't
    exactly


    unless the reeds are slightly damaged....
    ktm450awyeah likes this.
    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.

  7. #15
    King Moto tetley's Avatar
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    If going from an N8RG to a N8RH doesn't clean it up enough, then an N8RW will lean it more, or a N8RJ leaner still. But this is only in the 0 - 1/8 throttle zone where the needle is actually straight not tapered. (which is where you want to make changes)
    The '8R' is the needles' tapers, and all of the above are the same, although they may have to be on a different clip to get the same 1/8 - 3/4 throttle response.

    The NECJ works well on these and a lot of other engines as it is very lean at 0- 1/8 throttle (J) and has a very fat first taper from 1/8 - 1/2 throttle. This makes the bike very smooth for slow technical stuff, trail riding and tarmac cruising. A trade off is a little less power and snap lower down, but I keep my MJ rich at 172 - 175, so full power is available at WOT. As most riding is done at low throttle, this set up gives superb fuel range, 105 - 110 miles a tank on a trail ride! Bit less on an enduro of MX tack day.

    Ps, 'N' is just the series of Keihin needles, so irrelevant to tuning
    beefiddler likes this.

  8. #16
    King Moto tetley's Avatar
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    Quote Originally Posted by stumo View Post
    exactly


    unless the reeds are slightly damaged....
    Which causes it to run rich due to the blow back through the carb, causing multiple pick-ups of fuel
    steveman and sidecarbod like this.

  9. #17
    King Moto
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    2016 300exc carb question

    How do you damage the reeds on a 2016 / how many hours does it take to bust the reeds?

    From experience my 2015 300 was set up to run well in all bar 50+ degrees heat.... prob 30-40 odd range. When the temperature dropped a lot and I took it out for a quick blast it bogged when I opened it, then fluffed and cleared and either span up or wheelied at an alarming rate. I'm assuming it's went lean (relative ambient swing is high summer to winter here) but not had the time to play on it/adjust it yet (work/trackday season/trials bike/broken hand)....

    Was it ok in the summer, or was it running like this always? (Has it dropped off recently?

    They are a bit rich on the low side anyway.... guess it helps with low RPM enduro longevity?


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  10. #18
    The "Moto" stumo's Avatar
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    If you're out in the dessert i'm guessing you'll be revving it pretty hard quite a lot of the time.... these are the conditions where you'll damage the reeds a lot quicker than say typical UK conditions (unless you're a BEC rider) .... it won't take long to have a look
    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.

  11. #19
    King Moto
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    Bike has done 6hrs in my hands (15.5 to date), half of which have been following my Mrs on her first quad foray into the dunes.... I doubt they've went tits up since. Not revving as hard as the 200 and it didn't die (only rattled itself to bits being on the stop in 2nd in the soft stuff).

    Just trying to work out if we're in the right ballpark jetting wise....


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  12. #20
    The "Moto" stumo's Avatar
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    Quote Originally Posted by Miner View Post
    Bike has done 6hrs in my hands (15.5 to date), half of which have been following my Mrs on her first quad foray into the dunes.... I doubt they've went tits up since. Not revving as hard as the 200 and it didn't die (only rattled itself to bits being on the stop in 2nd in the soft stuff).

    Just trying to work out if we're in the right ballpark jetting wise....


    Sent from my iPhone using Tapatalk
    after the last reply i thought that you'd be leaner than here in the UK due to the heat (no idea about elevation)

    My idea would be to have a look on the jetting page and see how many steps away you are from std uk conditions (0-750 feet, 18c) then apply those steps to your jetting...

    so(say) std UK conditions say N8RH, clip 2, 38 pilot, 170 main

    looking at your jetting chart from std toi your temp and height , lets assume the needle goes down 1 clip from "std", pilot goes down 1 and the main goes down 1 step too, then you'd change the jetting to N8RH clip 1, 35, 168

    see what i mean?
    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.

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