Author Topic: JD Jetting for 250/300 SE-R  (Read 13898 times)

Boogie

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JD Jetting for 250/300 SE-R
« on: July 11, 2015, 07:47:48 AM »
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 SE R 300
Australia

Aussie_rider

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Re: JD Jetting for 250/300 SE-R
« Reply #1 on: July 11, 2015, 05:36:07 PM »
No sorry can't help you there. I find my jetting not bad from factory. Maybe just a little rich off idle but nothing really worth playing with. I know the conditions are a lot different down here in Vic to what they are up in Queensland though.
2015 se-r 300 factory.
Melbourne, Australia.

Boogie

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Re: JD Jetting for 250/300 SE-R
« Reply #2 on: July 11, 2015, 11:53:55 PM »
Yeah I don't mind the stock jetting but may give the JD kit a go .
2014 SE R 300
Australia

Aussie_rider

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Re: JD Jetting for 250/300 SE-R
« Reply #3 on: July 12, 2015, 02:08:33 AM »
I used a jd jetting kit in my gas gas and ended up changing the jd needle out again for another one.
 Looking back I think they are pretty expensive for what you really get. Have you played with your jetting at all yet? If not maybe just try making a couple of small adjustments to the standard jetting before you outlay the money for a jd kit. Did you get any spare jets and needles with your bike? I did, but I have not looked what they are.
2015 se-r 300 factory.
Melbourne, Australia.

Boogie

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Re: JD Jetting for 250/300 SE-R
« Reply #4 on: July 13, 2015, 12:29:13 AM »
Yeah I did get some spare jets and needles. Probably should fiddle with them first before spending cash.
2014 SE R 300
Australia

Clay

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Re: JD Jetting for 250/300 SE-R
« Reply #5 on: July 13, 2015, 05:41:45 AM »
All we've done here is raise the needle one or two clips to clean up the richness a bit.
Clay Stuckey
Sherco Offroad  www.shercooffroad.com
email: clay@shercooffroad.com
cell: 615 347 6519
Tennessee, USA

Aussie_rider

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Re: JD Jetting for 250/300 SE-R
« Reply #6 on: July 13, 2015, 06:41:25 AM »
All we've done here is raise the needle one or two clips to clean up the richness a bit.

Transmoto magazine over here said the same thing Clay. They moved the clip up one position and set the
Air  screw to 1 1/2 turns. At some stage I will probably set mine up like this, but the bike is good the way it is a little rich so no rush..
2015 se-r 300 factory.
Melbourne, Australia.

TechnoBob

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Re: JD Jetting for 250/300 SE-R
« Reply #7 on: July 15, 2015, 07:34:42 AM »
I agree that my 300 2 stroke was pretty good as is. I tried a JD jet kit on my GG 300 and hated it. Seems I'm in the minority in that I'm not sold on JD jet kits. How can those guys know what's perfect for every bike out there?
Claysville, PA    USA

PowerKord

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Re: JD Jetting for 250/300 SE-R
« Reply #8 on: July 15, 2015, 08:09:46 AM »
I have had mixed results with JD kits. But their support is very good and if the kit does not work for you they will try to make it right. I had a KX250 which ran like a pig stock. With a JD "red" needle it was one of the hardest running 250's I ever rode. If you get one of his kits and he only gives you one pilot jet, chances are you may need to purchase other pilots or mains. The two different needles do generally give you a lot of tuning potential.

On my SE-R 250 as delivered here in Ohio it was very rich and sputtered at lower RPM's. My first step was to swap the stock 40 pilot for a 35 and also went down one size to a 162 main from the stock 165 main. This cleaned up the bottom and seems to be the correct pilot for me. The midrange still sputtered a bit, so I went from the 4th clip to the second clip on the needle. The motor was slightly too lean at this setting. I have switched to the 3rd clip position but have not ridden the bike since. I will post back when I do.

My fuel mix is CAM 2 110 leaded with Repsol oil 43:1.
2014 SE-R 250
Northeast Ohio, USA

Clay

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Re: JD Jetting for 250/300 SE-R
« Reply #9 on: July 15, 2015, 08:18:20 AM »
If that doesn't work, go back to the stock jets and lean it out with the needle.
Everyone else has been pretty happy with that set up.
Clay Stuckey
Sherco Offroad  www.shercooffroad.com
email: clay@shercooffroad.com
cell: 615 347 6519
Tennessee, USA

GlennE

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Re: JD Jetting for 250/300 SE-R
« Reply #10 on: July 15, 2015, 10:46:02 AM »
In my neck of the woods I've known more people that take the JD jet kits out then put them in.

For those running higher elevation, my setup works pretty good.

I ride  6-10,000 ft in temps from 40-90 degrees

I run a 35 pilot, 155 main, N2ZJ needle (from an 09 300 XC-W) in the first (leanest clip)
2018 KTM 250 XC-W
(Sold)2014 Sherco SE-R 300, 12 GG 300, 11 300 XC, 09 CRF450R, 09 450 XCF, 00 RM 250, 95 YZ 250
Bozeman, Montana

PowerKord

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Re: JD Jetting for 250/300 SE-R
« Reply #11 on: July 15, 2015, 03:31:09 PM »
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?
2014 SE-R 250
Northeast Ohio, USA

Boogie

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Re: JD Jetting for 250/300 SE-R
« Reply #12 on: July 15, 2015, 04:00:27 PM »
For the record, my current jetting is:
PJ 38, MJ 165, N8RG Needle 3rd position, air screw 1.5 turns
Temp: 24c - 30c (75F - 86F) (although its a bit cooler now in winter...)
Elevation: approx 45m - 100m (150' - 330')
2014 SE R 300
Australia

Revyrider

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Re: JD Jetting for 250/300 SE-R
« Reply #13 on: July 15, 2015, 05:19:36 PM »
I leaned out the needle one clip on my 300, runs maybe slightly rich now
 which is ok by me. Did an alpine ride this weekend to 8000+ ft and definitely
 noticed it was running rich and down on power. I am gonna put my Timbersled
 snowbike kit on it this winter, will be interesting to see how much jetting I will
 need to do to make it run clean at altitude in colder temps.   
Marty
Revelstoke, B.C. Canada
2014 Sherco 300 se/r
2015 Yamaha YZ 450r Snowbike

GlennE

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Re: JD Jetting for 250/300 SE-R
« Reply #14 on: July 15, 2015, 05:57:56 PM »
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?

I don't remember exactly

I ran the suzuki RM triple taper needle in my Gasgas and it worked well. Never tried it in the Sherco though. I ran the NEDJ but the NECJ will work well too and is just a 1/2 clip leaner
2018 KTM 250 XC-W
(Sold)2014 Sherco SE-R 300, 12 GG 300, 11 300 XC, 09 CRF450R, 09 450 XCF, 00 RM 250, 95 YZ 250
Bozeman, Montana