Author Topic: JD Jetting for 250/300 SE-R  (Read 13897 times)

Clay

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Re: JD Jetting for 250/300 SE-R
« Reply #15 on: July 16, 2015, 10:02:48 AM »
Well I just got back from my first trip to an MX track with my 250. The clip in the 3rd position seemed to run pretty well, not lean or rich.

Glenn, Do you know how that N2ZJ needle compares to the stock Sherco needles as far a diameter, etc. ? Is that the RM needle I have heard people mention?
Powerkord,
PLEASE note that Glenn rides above 6000 feet. You're a few miles from Lake Erie and about 10 feet above sea level. What works for him won't work for you.
Clay Stuckey
Sherco Offroad  www.shercooffroad.com
email: clay@shercooffroad.com
cell: 615 347 6519
Tennessee, USA

PowerKord

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Re: JD Jetting for 250/300 SE-R
« Reply #16 on: July 16, 2015, 01:22:41 PM »
Yes, I did see that. Hopefully the stock needle works out OK for me. I hate swapping needles.
2014 SE-R 250
Northeast Ohio, USA

NJH

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Re: JD Jetting for 250/300 SE-R
« Reply #17 on: September 04, 2015, 10:17:05 PM »
Has anyone tried the JD jet kit for a 250/300 2 stroke?

Recent mag review here says it gives a big improvement in low revs and smooths out the mid range hit. It creates a more user friendly power curve...

Any thoughts?
2014 - 300 SE-R Factory
Newcastle, NSW, Australia

NJH

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Re: JD Jetting for 250/300 SE-R
« Reply #18 on: September 04, 2015, 10:45:49 PM »
I recently purchased the JD Jetting kit as nominated by Transmoto for my 300 SE-R Factory 2014. Tried the setting they recommended P-38, MJ-165, Needle Blue clip position 3. Bike went terrible far too rich, lowered the clip to position 1 (top clip) big difference, bike ran so much better.

Considering summer is around the corner and the needle was at its leanest position on the BLUE needle I decided to put the RED needle in so I can make it leaner when the weather warms up. Now fitted with RED needle at clip position 2 - now where talking, different bike to ride, engine pulling much stronger and smoother, able to hold higher gears, less clutch work required, as always starts first time every time. In fact it was a tad cranky on the power valve wild setting so I was used the mild setting, good but I was seeking a tad more snap when required, so I screwed in the air screw back to "1 full turn out" to make richer and rode on the wild setting, this was perfect for me, but hey I'm 56 but I like my tracks tight, rocky and plenty of hills, I'm not a wide open throttle man bike is far to fast for me.

So much better than standard jetting (yes I tried leaning out)

Cant help think Transmoto guys might be blind.

FYI - I live in Newcastle, NSW, Australia- Current Temp range 2 -22, riding elevation 0-3000 m 

Noel


Has anyone tried the JD jet kit for a 250/300 2 stroke?

Recent mag review here says it gives a big improvement in low revs and smooths out the mid range hit. It creates a more user friendly power curve...

Any thoughts?
[/quote]
2014 - 300 SE-R Factory
Newcastle, NSW, Australia

PowerKord

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Re: JD Jetting for 250/300 SE-R
« Reply #19 on: September 05, 2015, 12:42:26 PM »
When I had a KX250 the JD red needle was really good and the blue was crappy.

 I don't think the stock needle is going to stay in my 250. It's a little too rich on the bottom and too lean up top. I have a  couple OEM Keihin needles I'm experimenting with. I'll post back when I have some ride time on them.
2014 SE-R 250
Northeast Ohio, USA

Teepee146

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Re: JD Jetting for 250/300 SE-R
« Reply #20 on: September 05, 2015, 12:48:16 PM »
I recently purchased the JD Jetting kit as nominated by Transmoto for my 300 SE-R Factory 2014. Tried the setting they recommended P-38, MJ-165, Needle Blue clip position 3. Bike went terrible far too rich, lowered the clip to position 1 (top clip) big difference, bike ran so much better.

Considering summer is around the corner and the needle was at its leanest position on the BLUE needle I decided to put the RED needle in so I can make it leaner when the weather warms up. Now fitted with RED needle at clip position 2 - now where talking, different bike to ride, engine pulling much stronger and smoother, able to hold higher gears, less clutch work required, as always starts first time every time. In fact it was a tad cranky on the power valve wild setting so I was used the mild setting, good but I was seeking a tad more snap when required, so I screwed in the air screw back to "1 full turn out" to make richer and rode on the wild setting, this was perfect for me, but hey I'm 56 but I like my tracks tight, rocky and plenty of hills, I'm not a wide open throttle man bike is far to fast for me.

So much better than standard jetting (yes I tried leaning out)

Cant help think Transmoto guys might be blind.

FYI - I live in Newcastle, NSW, Australia- Current Temp range 2 -22, riding elevation 0-3000 m 

Noel


Has anyone tried the JD jet kit for a 250/300 2 stroke?

Recent mag review here says it gives a big improvement in low revs and smooths out the mid range hit. It creates a more user friendly power curve...

Any thoughts?
[/quote]

3000m? You might mean feet? I just rejetted my bike for riding around home which is around 900-1200m.
Pilot 35
Main 155
Mixture screw 1 turn out
Standard needle on second leanest position.

The bike was horribly rich from standard but I left it like it for the run in period.

Ive been spoilt with fuel injection for the last 7 years so not real good with carbs yet. Hopefully this setup works ok though.
2015 Sherco 300 SE-R Factory
Lithgow, Australia

NJH

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Re: JD Jetting for 250/300 SE-R
« Reply #21 on: September 05, 2015, 01:49:27 PM »
My error- unsure why I noted 3000 m. My riding elevation ranges from sea level to about 200m above sea level.

While the JD Jetting kit was expensive @ AUD $150.00 it sure has improved the performance of my bike. I was spending too much time with the standard needle, too rich, too lean, overall poor engine response.

Forgot to note I run BP Ultimate (98 Octane) with Motorex at 50:1



I recently purchased the JD Jetting kit as nominated by Transmoto for my 300 SE-R Factory 2014. Tried the setting they recommended P-38, MJ-165, Needle Blue clip position 3. Bike went terrible far too rich, lowered the clip to position 1 (top clip) big difference, bike ran so much better.

Considering summer is around the corner and the needle was at its leanest position on the BLUE needle I decided to put the RED needle in so I can make it leaner when the weather warms up. Now fitted with RED needle at clip position 2 - now where talking, different bike to ride, engine pulling much stronger and smoother, able to hold higher gears, less clutch work required, as always starts first time every time. In fact it was a tad cranky on the power valve wild setting so I was used the mild setting, good but I was seeking a tad more snap when required, so I screwed in the air screw back to "1 full turn out" to make richer and rode on the wild setting, this was perfect for me, but hey I'm 56 but I like my tracks tight, rocky and plenty of hills, I'm not a wide open throttle man bike is far to fast for me.

So much better than standard jetting (yes I tried leaning out)

Cant help think Transmoto guys might be blind.

FYI - I live in Newcastle, NSW, Australia- Current Temp range 2 -22, riding elevation 0-3000 m 

Noel


Has anyone tried the JD jet kit for a 250/300 2 stroke?

Recent mag review here says it gives a big improvement in low revs and smooths out the mid range hit. It creates a more user friendly power curve...

Any thoughts?
[/quote]
[/quote]

3000m? You might mean feet? I just rejetted my bike for riding around home which is around 900-1200m.
Pilot 35
Main 155
Mixture screw 1 turn out
Standard needle on second leanest position.

The bike was horribly rich from standard but I left it like it for the run in period.

Ive been spoilt with fuel injection for the last 7 years so not real good with carbs yet. Hopefully this setup works ok though.
[/quote]
2014 - 300 SE-R Factory
Newcastle, NSW, Australia

GMP

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Re: JD Jetting for 250/300 SE-R
« Reply #22 on: September 08, 2015, 06:05:49 AM »
The problem with JD kits/needles is that there are no half clip options for fine adjustments, and the Blue/red are several dia sizes apart.  They either work great or don't work.  What is the standard Sherco needle?  If your basically happy with that, get the half clip leaner/richer options and fine tune.  A full clip change is many times too extreme especially on a 300.  For example an N8RJ is a half clip leaner than an N2ZJ.  Personally I like the NECx/NEDx family (Suzuki needles).  If you think the 300 is a bit much at times you should try this. 

weantright

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Re: JD Jetting for 250/300 SE-R
« Reply #23 on: September 09, 2015, 05:29:54 AM »
I used a thin washer to raise/lower the needle giving similar results as a 1/2 clip on my snowmobiles.
2017 6 days 300sef-r w/DalSoggio and flow (Stolen), 2016 XTrainer w/Rekluse & KYB's, 2014 Husky FE250
Ohio, USA

GMP

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Re: JD Jetting for 250/300 SE-R
« Reply #24 on: September 09, 2015, 06:31:25 AM »
I used a thin washer to raise/lower the needle giving similar results as a 1/2 clip on my snowmobiles.

OK for a test, but bad idea to leave it that way.  Needles float for a reason, so they don't side load and wear the nozzle.  What I have done in the past to tune JD needles is machine the slide recess .5mm(half clip) deeper and run the .5mm washer either above(leaner) or below(standard) the circlip, to retain the needle float.

weantright

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Re: JD Jetting for 250/300 SE-R
« Reply #25 on: September 09, 2015, 10:18:38 AM »
So you did the same as I did???? Seem to work great for the many top XC racers for years before FI.
2017 6 days 300sef-r w/DalSoggio and flow (Stolen), 2016 XTrainer w/Rekluse & KYB's, 2014 Husky FE250
Ohio, USA

GMP

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Re: JD Jetting for 250/300 SE-R
« Reply #26 on: September 09, 2015, 06:09:24 PM »
For tweaking JD needles yes.  Other than that, it's cheap and easier to buy the half clip variant of a needle your experimenting with.  Different diameters as well.

Alex

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Re: JD Jetting for 250/300 SE-R
« Reply #27 on: March 19, 2018, 03:16:27 PM »
I just wanted to add to this thread about the JD Jetting kit. I got one with the bike, but didn't put it in initially. I took the bike out on it's first ride with a buddy on his 06 yz250. Swapping back and forth the YZ would eat the sherco for breakfast. The YZ has a one step leaner than stock pilot, and stock everything else. I put in the JD suggested 162 main, 38 pilot(which was already installed apparently) and Red JD needle on the 4th clip. I ended up 1-1/4T on the air screw. The tables have turned and the Sherco woke right up. 490m(1600') elevation and 10C(50F) air.  I suspect the 162 is on the lean side but should get better as the temps warm up. When the snow leaves the hills it will go up to 1,700m(5,600'). Hopefully I'm not on the dangerous side of lean on the main? Pretty new to the jetting world.

Instagram @alex88bc | Youtube @thenortherner   Smithers, BC, Canada
Current: 2017 Sherco 300SE-R Racing | 2016 KTM 500 EXC Six Days | 2012 Aprilia Dorsoduro 1200
Past: 2010 KTM RC8 | 2009 BMW G450X | 2007 Sherco 290 Trials | 2006 Suzuki DR650 | 1986 Suzuki GR650 Cafe

alang

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Re: JD Jetting for 250/300 SE-R
« Reply #28 on: March 21, 2018, 06:37:39 PM »
g stock
h alternate leaner
w leaner
j leaner
last letter starting diameters rich to leaner
2017 Sherco 300 2T Factory
2016 Aprilia Tuono 1100 Factory
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Azle, Texas

Alex

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Re: JD Jetting for 250/300 SE-R
« Reply #29 on: April 25, 2018, 01:16:38 PM »
Just wanted to remove some of the magic from the JD Needles.

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

Nxxx needle diameters
D=2.685mm
E=2.695mm (JD Blue)
F=2.705mm
G= 2.715
H= 2.725 (JD Red by Alex's Measurements)
W/I=2.735 (JD Red)
J= 2.745
K=2.755
http://www.gasgasrider.org/forum/showpost.php?s=8af10d4c09ace0fc2eac3256ecfafd96&p=110124&postcount=3

I broke out the micrometer and can confirm the measurements on the straight diameters. I believe they are close to being a N3EE(Blue) and N3EH(Red). The JD needles are a 3 taper whereas the stock is a dual.  From my interwebz trolling that means the red needle is simply a half clip leaner than the stock N8RG (I got an L value of 36.85mm for the N8RG and 36.40mm for the RED). Just trying to remove some of the magic behind them. :D
« Last Edit: April 26, 2018, 12:55:38 PM by Alex »
Instagram @alex88bc | Youtube @thenortherner   Smithers, BC, Canada
Current: 2017 Sherco 300SE-R Racing | 2016 KTM 500 EXC Six Days | 2012 Aprilia Dorsoduro 1200
Past: 2010 KTM RC8 | 2009 BMW G450X | 2007 Sherco 290 Trials | 2006 Suzuki DR650 | 1986 Suzuki GR650 Cafe