Rieju & GasGas Legacy Riders Club Forum  

Go Back   Rieju & GasGas Legacy Riders Club Forum > GasGas Enduro Technical Forums > Enduro Engine - 2 stroke

Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


Reply
 
Thread Tools Display Modes
  #1  
Old 08-29-2018, 11:04 AM
Doc Brown Doc Brown is offline
Senior Member
 
Join Date: Dec 2017
Location: Austria, Europe
Posts: 586
Default Jetting alternative wanted

On my 300/2018 I run the JD Kit in the 38 Keihin.

I have the feeling, that it is a little bit lean in the second half while its fine from zero to 1/4 throttle, but after that its a bit too lean in my opinion.

Currently I run: MJ178, Clip 3, red JD needle, PJ42, AS 1.75 turns open. Temperature 82F, Altitude 600 ft

Is there a known alternative to the standard N1EF needle? Its good once the throttle is at 1/4, but down low I dont like it.

Any hints/tricks appreciated.


Reply With Quote


  #2  
Old 08-29-2018, 03:04 PM
jpgibson's Avatar
jpgibson jpgibson is offline
Bronze Level Site Supporter
 
Join Date: Mar 2014
Posts: 52
Default

The 3 guys I know with 2018 300's all use NECW I beleive.All of them have had their heads recut too.My bro gave up on his 250 '18 , and just bought a Beta 300.
All the 300's seem to run great now ( although they ran fine before too!!)
Reply With Quote
  #3  
Old 08-29-2018, 04:21 PM
Jakobi's Avatar
Jakobi Jakobi is offline
Super Moderator
 
Join Date: Oct 2010
Location: Australia
Posts: 7,994
Default

The JD needles do lean off a lot towards WOT. Throw a bigger main jet at it.

Their red needle is a H diameter from memory. N3EH#3 178 with the same pilot will make for some aggressive power.

NECW is a good choice for nice linear delivery. One step leaner on the diameter for clean delivery off idle.. and just builds. Similar in profile to the N1EF once past the first taper.
Reply With Quote
  #4  
Old 08-30-2018, 02:40 AM
Doc Brown Doc Brown is offline
Senior Member
 
Join Date: Dec 2017
Location: Austria, Europe
Posts: 586
Default

Thank you guys!


Quote:
Originally Posted by jpgibson View Post
The 3 guys I know with 2018 300's all use NECW I beleive.All of them have had their heads recut too.My bro gave up on his 250 '18 , and just bought a Beta 300.
All the 300's seem to run great now ( although they ran fine before too!!)
I have a cut head too. The JD kit works well, the transition from mild to wild is too aggressive and caused by a lean mixture.


Quote:
Originally Posted by Jakobi View Post
The JD needles do lean off a lot towards WOT. Throw a bigger main jet at it.

Their red needle is a H diameter from memory. N3EH#3 178 with the same pilot will make for some aggressive power.

NECW is a good choice for nice linear delivery. One step leaner on the diameter for clean delivery off idle.. and just builds. Similar in profile to the N1EF once past the first taper.
Would the bigger main jet enrichen it in the middle aswell? I have a 182 in my parts box I could try (currently running a 178).

I'll get a NECW needle too.

Thanks again
Doc


edit: ordered the NECW, will receive it probably Thursday next week :-)
Reply With Quote
  #5  
Old 08-30-2018, 07:36 AM
Keg Keg is offline
Senior Member
 
Join Date: Aug 2006
Posts: 304
Default

I have the N1EH in my GP at the moment. Very cold and sea level riding and it is great. A little thirsty on fuel compared to the NEDW but starts better and never knocks, even when stuck in a gully with radiators about to boil.

Jakobi, Second half of the needle looks visibly leaner than the NEDW. I should mic them up and see.
__________________
EC300 2019 (11 Gassers owned, many more to go)
Reply With Quote
  #6  
Old 08-30-2018, 03:55 PM
Jakobi's Avatar
Jakobi Jakobi is offline
Super Moderator
 
Join Date: Oct 2010
Location: Australia
Posts: 7,994
Default

Cheers Keg.. I haven't laid them beside eachother for a long time. I'll have a look today at some point too. The N3 needles are very thick right through to the point in comparison to both the N1 and NE series.
Reply With Quote
  #7  
Old 09-01-2018, 06:48 AM
GGian GGian is offline
Member
 
Join Date: Jul 2018
Posts: 5
Default

Hey guys. Since the needle runs down the guts of the main jet, main jet size will affect the overall jetting from bottom, mid and of course top. No harm in trying one size up or down and see how it goes. My 18 250GP is running NEDW 3rd and 185 main 42 pilot, stock head, running great, fuel efficient and clean. For an 18 300 std gas gas Australia recomends NECW 3rd, 42 pilot and 175 main. Goodluck with it.
Reply With Quote
  #8  
Old 09-01-2018, 05:52 PM
Jakobi's Avatar
Jakobi Jakobi is offline
Super Moderator
 
Join Date: Oct 2010
Location: Australia
Posts: 7,994
Default

The needle doesn't run down the main jet.. The main controls the flow of fuel into the emlusion tube/needle jet.

See image courtesy of Dansmc


For a crude test to see how much influence the main has over the range of throttle positions you can simply take it out and go for a ride.
Reply With Quote
  #9  
Old 03-12-2021, 10:48 AM
fabiopaulo fabiopaulo is offline
Member
 
Join Date: Jan 2021
Location: Portugal
Posts: 9
Default

Quote:
Originally Posted by GGian View Post
For an 18 300 std gas gas Australia recomends NECW 3rd, 42 pilot and 175 main. Goodluck with it.
This jetting is for all purpose or only for technical terrain? I want to change my N1EF needle because i think my 18' EC300 is knocking in half throttle because of it and i'm looking for the best jetting. Here in my area(Portugal) we don't have to much elevation, is about 0-500m and i have all types of terrain, woods, deep sand and fast open roads. Could you help ? thanks
Reply With Quote
  #10  
Old 03-12-2021, 02:00 PM
farmerj's Avatar
farmerj farmerj is offline
Platinum Level Site Supporter
 
Join Date: Dec 2007
Location: Salem, OR
Posts: 361
Default

Fabio,

IMO both needles could be considered "all purpose", it's really personal preference.

The NECW is not as "lively" - smooth and linear, as others have said. So to that extent, it may be better suited for technical terrain - but it depends on the rider. I like riding the technical stuff, but prefer more of a "hit".

Something like the N3EH will be more aggressive, but I find that to be more fun, especially in sand or open terrain.

Jacobi has given the two of the most popular jetting options below:
42 pilot/178 main with N3EH (or variant - N3EG or N3CH)
- or 40/175 NECW.

From what you've said about where you're riding I'd suggest you start with the N3EH.

Let us know what you think!

Jeff

-----

Jacobi's recommendations above are good ones -

N3EH#3 178 with the same pilot will make for some aggressive power.

NECW is a good choice for nice linear delivery. One step leaner on the diameter for clean delivery off idle.. and just builds. Similar in profile to the N1EF once past the first taper.
__________________
'18 GG XC 300
'05 GG DE 300
'01 GG txt 321
Reply With Quote
Reply



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
alternative to stock bars on '06 EC300? brider General Discussions & Announcements 3 08-02-2014 09:03 AM
Alternative starter / light switches? SingleTrackMind Enduro Electrical & Wiring 3 05-07-2014 05:19 PM
Alternative lighting for the 2012? myrcrocks Enduro Electrical & Wiring 11 10-18-2012 08:40 PM
Float Bowl Gasket - Alternative Harry Enduro Intake/Carburetion - 2 stroke 4 02-08-2012 01:26 AM
Noz. alternative of N1EG BIS Enduro Intake/Carburetion - 2 stroke 3 07-13-2009 05:25 AM




All times are GMT -5. The time now is 08:37 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright 2009 - GasGasRider.org