Power valve setting for mellow ride ?

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Thread: Power valve setting for mellow ride ?

  1. #1
    Teenage Moto
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    Power valve setting for mellow ride ?

    Hi
    This is for a friend struggling with his 2016 exc300 it's a 40 hour bike bone stock he's had it from new and never touched it, only thing he has is the green spring in but it's hitting hard when coming on the pipe instead of being sweet and mellow how he wants it, stock gearing 14t front stock rear,
    Can anyone recommend a good jetting spec and powervalve setting with the brass dolly to save trawling through a million old threads please lol

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  3. #2
    The "Moto" stumo's Avatar
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    I've not tried a green spring but the position of the adjuster only affects the point in the revs at which the ex valve starts to open...

    You could get your "fwiend" *cough BULLSHIT* to try the adjuster all the way out then either half or one turn in and have another try.... just to see the effect.

    As for jetting i'd try n8rg clip 2 38 or 40 pilot 170 main AS 1.75 out, it won't be the mellowest jetting out there but it'll be honest, you could try the necj that some like as it's supposed to be very smooth, not sure what people ended up using with it, have a search on here ....

    Hope your "friend" wink wink gets it sorted
    13 250exc, 14xc head, 38pilot, n8rh clip2 with 0.2mm shim, 168 main.... '17 300 exc, 45pilot, 460 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. #3
    The "Moto" Pindie's Avatar
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    Your "friend" might also want to look at what needle it's got. If it's like my 200s oem needle (N1Ei), I just couldn't get a smooth transition on the throttle. I used necj, now nedj as it feels nicer at smaller throttle openings. The OEM needles seem to favour the ex MX rider more who gets the throttle open fast and hard.
    This is all I can see when I open the throttle:

    Before https://www.youtube.com/watch?v=UWMWXJvX8e4

    After https://youtu.be/VtBLqkh5u8k

    Keep out the way!

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  6. #4
    Teenage Moto
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    Friend ? lol didn't think of it like that haha but yeah it is actually for my mate I don't ride an old dinosaur anymore 17 only thanks ?
    Thanks though boys it gives him something to start with, he wants to really chill it out, I don't remember my 16 being like that it was really smooth out the box, his pv has about 3 threads showing

  7. #5
    The "Moto" stumo's Avatar
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    if it's on the green spring and it's firey then jet it richer than it is now.... ride your mates bike n see what it's doing... if it's lean(er) then it'll react fast to small throttle openings... i'd say go down the necj route.....
    13 250exc, 14xc head, 38pilot, n8rh clip2 with 0.2mm shim, 168 main.... '17 300 exc, 45pilot, 460 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.

  8. #6
    The "Moto" steveman's Avatar
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    Quote Originally Posted by burger72 View Post
    Friend ? lol didn't think of it like that haha but yeah it is actually for my mate I don't ride an old dinosaur anymore 17 only thanks ?
    Thanks though boys it gives him something to start with, he wants to really chill it out, I don't remember my 16 being like that it was really smooth out the box, his pv has about 3 threads showing
    3 threads is too much. The further its in the harder it will hit. For a smoother transition he should wind it out until it is a little less than flush, it will show only one thread then.
    For a more comprehensive testing he should follow stu's advice and try half turn wise...

  9. #7
    Teenage Moto
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    Cheers really appreciate the help as he genuinely wouldn't know what to do, I know when I looked at the carb before it had the n8rg needle I think and 35 pilot I think with 170 or 175 main pretty sure it was clip 2.

  10. #8
    The "Moto" stumo's Avatar
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    try a bigger pilot, a 38 or better still a 40 (if it doesn't get too rich) will help calm it down and will be smoother too, set the air screw accordingly
    13 250exc, 14xc head, 38pilot, n8rh clip2 with 0.2mm shim, 168 main.... '17 300 exc, 45pilot, 460 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. #9
    Teenage Moto
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    Thanks again, shall give the 40 ago for him, you think it's worth a bigger main and maybe dropping the clip back down to the middle #3 ?

  12. #10
    The "Moto" stumo's Avatar
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    stick the pilot in, set the AS** and then try it, think it would be too rich on clip 3 but you can always try it, only takes a few mins to swap it

    always set the AS when the bike has fully warmed up... ie after atleast 10 mins riding, never set it when it's cold....

    if it's got a 170 already i don't think it's worth going bigger BUT as said before it only takes a few mins to swap it...

    ONLY do 1 thing at a time so you know what the change has done, too many people change lots of things and if it doesn't work correctly they don't know what is causing any of the new problems.
    Pindie likes this.
    13 250exc, 14xc head, 38pilot, n8rh clip2 with 0.2mm shim, 168 main.... '17 300 exc, 45pilot, 460 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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