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


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  #1  
Old 08-29-2018, 11:04 AM
Doc Brown Doc Brown is offline
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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.


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Old 08-29-2018, 03:04 PM
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jpgibson jpgibson is offline
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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!!)
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Old 08-29-2018, 04:21 PM
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Jakobi Jakobi is offline
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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.
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Old 08-30-2018, 02:40 AM
Doc Brown Doc Brown is offline
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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 :-)
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Old 08-30-2018, 07:36 AM
Keg Keg is offline
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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.
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  #6  
Old 08-30-2018, 03:55 PM
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Jakobi Jakobi is offline
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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.
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Old 09-01-2018, 06:48 AM
GGian GGian is offline
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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.
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Old 09-01-2018, 05:52 PM
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Jakobi Jakobi is offline
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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.
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