Author Topic: 2019 SER 300 Factory jetting  (Read 13370 times)

Danh124

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2019 SER 300 Factory jetting
« on: September 25, 2018, 07:09:20 AM »
Hi guys, just picked up a new 2019 factory 300 smoker.
I have been playing with the jetting and whilst I feel like I'm on the right track I welcome your thoughts.

With the stock jetting I could not get the air screws to have any effect. If I wound it all the way in to closed the engine idled fine. Additionally I could wind it out all day and nothing would happen.

I went to a 40 PJ and whilst it was more responsive to air screw position it would still run with the air screw closed. Winding it out did not appear to influence rpm at all.

So I went to a 38 PJ and that was much better, max rpm achieved at 2 turns out and a responsive throttle, bike returns to idle well.

Moved on to the needle position next. I had a blubber at 1/4 throttle that seemed rich, still had sponge coming from the pipe so in my inexperianced mind thought i would lean out the needle 1 clip.
This was very marginally better so i thought bigger it and went bold and went a whole needle leaner but on clip 3 rather than 2.

This was very promising and i think the N8RF on clip 2 will clear up the last bit of blubbering at low throttle positions.

I have not ridden since the last change but as it stands my jetting is 38PJ, N8RF(2) AS 2 out from closed and the stock 172 main.
I think I will go to a 170 main once I do a plug chop test.

I'm in Australia and ride at 0-1000ft 15-25degrees Celsius.

Am I too lean? Or am I heading in the right direction?

I'm a 2 stroke rookie so all thoughts appreciated.

By the way the bike is spectacular!


alang

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Re: 2019 SER 300 Factory jetting
« Reply #1 on: September 25, 2018, 08:47:56 AM »
My 2017 300 Factory came with 40 pj N8RG clip 3 and 165 main.  I ride at 800 ft elevation.
I went to a 38 PJ N8RH clip 3 cooler weather clip 2 hot weather kept 165 main.  (I think it is a 165)
air screw 1.5 turns out.
It wasn't too bad stock, maybe just a hair rich.
N8RF is a pretty rich starting diameter on the needle.
2017 Sherco 300 2T Factory
2016 Aprilia Tuono 1100 Factory
2019 Santa Cruz Tallboy Carbon R
Azle, Texas

rkm

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Re: 2019 SER 300 Factory jetting
« Reply #2 on: September 25, 2018, 03:26:16 PM »
The 19 jetting is quite a bit richer. Im at altitude( 5-7k ft) but Im at 42, 2.5AS. N8RF #1 and 162. High alittude jetting can require a larger pj so ignore that.

Could go down on pj but it idles so good right now. Just need some better mileage.
N8RF #2 was too rich for me. I might even try the N8RG next ride.
I dont think youre gonna be too lean yet.
What kind of riding are you doing?

Danh124

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Re: 2019 SER 300 Factory jetting
« Reply #3 on: September 25, 2018, 08:23:58 PM »
Thanks guys. I am doing slow technical singletrack mainly with a little but of twin track faster stuff as well.

Jason

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Re: 2019 SER 300 Factory jetting
« Reply #4 on: September 26, 2018, 05:42:39 AM »
I've had good results with the NECJ/NEDJ Suzuki needles. They really smooth out the power, no flat spots or big hits.
2016 300 SE-R
Ontario, Canada

PowerKord

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Re: 2019 SER 300 Factory jetting
« Reply #5 on: September 27, 2018, 04:26:01 PM »
I'm running Suzuki NEDJ/NEDK needles in my 250 and they are night and day better than the stock needle my bike came with.
2014 SE-R 250
Northeast Ohio, USA

Danh124

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Re: 2019 SER 300 Factory jetting
« Reply #6 on: September 28, 2018, 06:43:32 AM »
How does the NECJ compare to a N8RF in terms of leaner or richer?

PowerKord

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Re: 2019 SER 300 Factory jetting
« Reply #7 on: September 29, 2018, 12:42:11 PM »
Check this out there are a lot of options to get you right!
2014 SE-R 250
Northeast Ohio, USA

Andrei

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Re: 2019 SER 300 Factory jetting
« Reply #8 on: October 11, 2018, 09:10:27 AM »
So how did it go? :) I live in sweden and been fiddling with jetting on my 300 -19. Tried NEDW #3 #40 #170. But I think I lost some bottom end, now I have N8RF #3 #40 #172. Have not tried it yet. Guess I will have to lean it out with G diameter if its still to fat.

Another question, when I got the bike I fouled the plug after 1h or so, and when I installed NEDW I noticed the idle screw was screwed in quite a bit and I had to screw it out several turns to get the idle down, could that be the reason for fouling the plug with the original jetting? (172, 42, N8RE clip 3)
I could not get the air screw to make any big difference when the bike was new. Maybe the idle screw was set to high so the airscrew was not working as intended?

alang

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Re: 2019 SER 300 Factory jetting
« Reply #9 on: October 11, 2018, 01:07:41 PM »
yes, idle set too high prevents the air screw from doing it's metering.
I wouldn't use J, K or W starting diameters; too lean IMO.
Try H or G (richer than H) starting diameters. F may be too rich.
The Suzuki needles NEC"X" or half clip richer NED"X" usually give smooth power delivery,
but I prefer the stock N8R"X" or even N2Z"X" needles.
2017 Sherco 300 2T Factory
2016 Aprilia Tuono 1100 Factory
2019 Santa Cruz Tallboy Carbon R
Azle, Texas

Danh124

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Re: 2019 SER 300 Factory jetting
« Reply #10 on: October 12, 2018, 04:10:52 AM »
Unfourtunantly I am working away overseas until December so I am not able to do any more testing.
My next test will be the N8RF clip 2 38, 170.
I like the feel of the 38 but am worried it is to lean.

I have an NECJ now and may try a 40 pj with the leaner NECJ to try and smooth the off idle blubber.

Does anyone know why the 2019 models have much richer settings than the 2018?
Looking at some of the 2018 jetting charts I think I will be pretty close to the 2018 jetting once i am done.

Keep the tips going guys I am a jetting spastic so all your info is gold to me.

Thanks

rkm

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Re: 2019 SER 300 Factory jetting
« Reply #11 on: October 12, 2018, 07:55:44 AM »
Winters here for us so Im done until May (last ride was six inches of snow and 36F)

Where im at now:
40, 1AS. N8RF #1 and 162. 5-8k feet

Plan was to try a 38 pilot next.

Danh124

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Re: 2019 SER 300 Factory jetting
« Reply #12 on: October 16, 2018, 09:49:54 PM »
Well I have just been told there is an updated map that should now be installed in the 2019 2 stroke models.
I will be going back to the origional jetting and getting this installed now I guess.
I guess my jetting efforts have been a waste of time so far lol.

alang

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Re: 2019 SER 300 Factory jetting
« Reply #13 on: October 17, 2018, 05:19:06 AM »
Updated map?
In new revised ECU?
2017 Sherco 300 2T Factory
2016 Aprilia Tuono 1100 Factory
2019 Santa Cruz Tallboy Carbon R
Azle, Texas

Clay

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Re: 2019 SER 300 Factory jetting
« Reply #14 on: October 17, 2018, 05:48:11 AM »
Well I have just been told there is an updated map that should now be installed in the 2019 2 stroke models.
I will be going back to the origional jetting and getting this installed now I guess.
I guess my jetting efforts have been a waste of time so far lol.
New map? There's nothing on the technical site in Sherco network.
Clay Stuckey
Sherco Offroad  www.shercooffroad.com
email: clay@shercooffroad.com
cell: 615 347 6519
Tennessee, USA