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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc.


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Old 06-09-2020, 02:42 AM
Doc Brown Doc Brown is offline
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Default Starting diameters

Anyone out there who knows which starting diameters the following needles have: ( I am unable to drive to my garage today so can't measure...)

N1EF
NECW
JD_red (mine has 2 scribes)

The question I ask is because the bike sounds rich with the NECW in #3 on the first third of the rev range and I try to figure out why people constantly tell me it is a lean needle. It isn't in my opinion. It is not even lean at WOT running a 172 at 71 F.


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Old 06-09-2020, 03:34 AM
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You said rev range.

Always think throttle position.
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Old 06-09-2020, 01:52 PM
Doc Brown Doc Brown is offline
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I apologise, but still need the diameters
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Old 06-09-2020, 02:55 PM
hannesd hannesd is offline
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all i have is :
N1EG : (thickest diameter) 2.7mm, tip is 1.4mm
NECJ : 2.75mm tip is 1.4mm

what PJ are you running? have you tried 1 step leaner?
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Old 06-09-2020, 03:44 PM
swazi_matt swazi_matt is offline
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i seem to remember jakobi listing these in the jetting database
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Old 06-09-2020, 05:12 PM
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From someone clever on the forum,can't remember who posted it but super useful-
Nxxx needle diameters
D=2.685mm
E=2.695mm (JD Blue)
F=2.705mm
G= 2.715
H= 2.725
W/I=2.735 (JD Red)
J= 2.745
K=2.755
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Old 06-09-2020, 05:38 PM
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Quote:
Originally Posted by gg3 View Post
From someone clever on the forum,can't remember who posted it but super useful-
Nxxx needle diameters
D=2.685mm
E=2.695mm (JD Blue)
F=2.705mm
G= 2.715
H= 2.725
W/I=2.735 (JD Red)
J= 2.745
K=2.755
I posted that.. I didn't measure them though. Found in my studies and saved. Been posted a few times.
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Old 06-10-2020, 01:50 AM
Doc Brown Doc Brown is offline
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Thx to GG3 and Jakobi!
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Old 06-10-2020, 02:00 AM
Doc Brown Doc Brown is offline
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Quote:
Originally Posted by hannesd View Post
what PJ are you running? have you tried 1 step leaner?
42. No, not yet but will give it a try once the weather has stabilized. Currently we have catastrophic weather starting with 12 degrees Celsius in the morning, 23 two hours later and 12 degrees 30 minutes later due to heavy thunderstorms. Humidity changing extremely all the time...

But I think, considering the JD_red worked well down low, that the 42 is also ok with the NECW as they have the same starting diameter of 2.735. Nevertheless it is worth a try as I found one difference:
with NECW I don't need to pull the choke and that indicates it may be too rich...
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Old 06-10-2020, 09:45 AM
hannesd hannesd is offline
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no need for a chocke with a cold engine, indeed indicates a rich situation.
if it's obvouisly running rich on the bottom, i'd try the 40PJ anyway.
does turning the airscrew have effect with the 42 PJ? if not go ahead and put the 40 and be amazed
put on a closed helmet ,rain coat and pants an go out testride :-p
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