2010 Jetting Saga Continues

[Jakobi]

Originally Posted by Bailey28

I ordered an N3EH and an NOZH today. I am anxious to get them in the mail and start experimenting again for the hot weather.

I also found a post on trimming the jet shroud nozzle screen, the part that sticks up into the venturi. I had this done by Ron on my old KDX carb and it cleaned up the 1/8 throttle burble.

I may try to shave 1mm off the screen height, it is supposed to lean the mixture in this area the same as if you changed to a # leaner slide.

You should see if you can get an N3EJ or N3CW aswell Bailey. I had the best results with the N3EJ out of all the N3 range needles I have tried. The W is one step richer on the diameter and the C half a clip leaner. Good for fine tuning.

I'd actually like to try an N1EJ to see how that alters the power curve.

[mrkartoom]

Originally Posted by Jakobi

Update: 42 is on the money. Idle screw and air screw both functioning at full temp. The bike was super smokey from warming up on the stand but once taken out and ridden properly (even in single track) the smoke cleared right up. No hanging idle at all. You beauty!

Excellent! I didn't get a chance to do any jetting yesterday since my new master cylinder showed up. I spent what time I had changing that out and now have a proper working clutch. Mine smokes a bit at start up too, but also cleans out nicely like yours. I still have that lean feeling bog right off idle though, so I will report back what clears that up.

[Bailey28]

Guys I am also experimenting with a 30 degree 4 petal reed cage from an old Honda CR250. According to Eric Gorr, the 30 degree cage is focused on low to midrange power delivery as is the 4 petal design.

I have the V force 3 in right now; I am anxious for the new fiberglass reeds to come in so I can try that combo out. I found a set of Aktive reeds for cheap.

I need to sand the reed intake area on the GG as the lower petals may wear faster due to being as cast and not smooth. The upper area is nice and smooth from the factory. In fact with about 25 hours on my GG so far, one of the stock V force carbon fiber reeds is already frayed along the tip. I don't over rev either.

For a few bucks, I'll try it! I love tinkering with this, it helps me learn a bit too.

[swazi_matt]

I am trying to find needle specs for the n3eh range and the nedj range of needles

anyone have some links?

[Jakobi]

Specs how? Sizes? Part numbers? Tapers?

N3EH
Manufacturer: Genuine KTM Part
Manufacturer Part#: 54731034700
Item Number: OEM539584
http://www.2wheelpros.com/oem-parts/...4700-part.html

Straight diameter: 2.725mm
Dual taper: Rich to Lean (steep transition mid range)
Leaning off twin taper requires rich main

NEDJ
Manufacturer: Genuine Suzuki Part
Manufacturer Part#: 13383-37FM0
Item Number: OEM245400
http://www.2wheelpros.com/oem-parts/...7fm0-part.html

Straight diameter: 2.745mm
Tri Taper: Lean to Rich
Third taper continues to supply fuel to WOT. Pairs with smaller main.

[swazi_matt]

specs as in a table giving the whole range of sizes for atype of needle, ie so i can tell what mark/code would be the next richer/leaner

like the one shown on this thread http://www.gasgasrider.org/forum/showthread.php?t=9656 i see here it is called a needle chart

reason i ask is that i find that when i enter nedj or nedw in the 2002 jd jetting chart it gives the same output so i am guessing i am entering it wrong

[Jakobi]

They are OEM needles. They don't come offering different tapers.

The choices you have for both are as follows
1) Different needle diameters
2) Different clip positions
3) Different needle (for half clip changes)

Thats it!

1) Diameters (for all OEM needles)
The last letter represents the needle diameter of the straight section of the needle only. Generally idle to just off idle only. Needle straight sections vary in length depending on the taper profiles too. N1Ex has a really short straight section.

D=2.685mm
E=2.695mm (JD Blue)
F=2.705mm
G= 2.715
H= 2.725
W=2.735 (JD Red)
J= 2.745

2) Clip positions
Pretty self explanatory.

3) Alternate Needles.
Both N3Ex and NEDx both offer half clip leaner alternatives. N3Cx and NECx

To summarise the diameter varies, as does the clip positions. The diameter is mostly for idle and off idle response. 1/8th throttle burble. The clip positions cover from here through to 3/4 throttle with the biggest impact at 1/4 throttle.

N3EJ#3 is leaner than N3EH#3, but only on the needle straight.
N3EH#2 is leaner than N3EJ#3 for most of the needles effect, but richer on the straight section.

The straight section works in conjunction with the pilot circuit as there is a big overlap here. NEDW 40 and NEDJ 42 are very very similar.

Want more?

[swazi_matt]

crystal! thanks that was all i needed (...for now;-)

[Jakobi]

Too easy Matt..

I didn't know if I had much more to tell you anyway. I'm pretty sure N8Rx is half a clip richer than N3Ex.

Here's a little something I copied and pasted in my notes. I can't confirm its 100% accurate as I haven't used the needles there. All my testing has been at the leaner end of the spectrum with no interest or need to go richer.

In 1/2 clip variations from leanest to richest they are...
N89x=leanest
N3Cx
N3Ex
N8Rx
N2Zx
N4Dx
N3Vx
N4Ax
N6Mx=richest