Posted January 09, 2001 - 02:37 AM
question; what is the measurement used to get the middle suffix? is it to the start of the taper or as i think you wrote-to halfway down?
what relavence is the starter jet-any info on it's circuit?
if for example one needle is a DTL & another is a DTS does that mean that because the straight bit is different that when the tapers start at the same point one will be narrower than the other at any given point?
in a different example, if one needle is a DXM & another is a DKM & therefore the tapers start at different points on the needle, doesn't this also mean that at any given point one will be narrower than the other?
have you been experimenting lately?
what about those APJ diaphram's are they in yet?
i sounded abrupt other day. don't put anything in your pipe! sorry.
[This message has been edited by Taffy (edited 01-09-2001).]
Posted January 09, 2001 - 07:53 AM
The middle letter refers to a distance from the top clip slot to mid-taper at a diameter of 2.515mm. This is labeled as L1 in the FCR needle pictures at www.carbparts.com . It has an effect on where the taper starts but the taper start changes when the straight diameter changes.
All DT- needles have EXACTLY the same jetting past 1/4 throttle.
DTL and DTS have their tapers start at different heights. Because DTL has a smaller straight diameter it's taper starts lower. After the tapers start, these are identical needles. You can make a DTS into a DTL by grinding down the straight diameter.
DXM and DKM have the same degree of taper but the whole tapered section is shifted lower on the DX- needles. DXM will run much leaner past 1/4 throttle than DKM when using the same clip position. Yes, for the whole length past 1/4. Before 1/4 they have the same diameter 2.715mm (M).
The clip can be shifted to make needles run identical when the 2nd letter is close. Each letter is 1/2 clip for these (skips O). K and X are 6 clips apart (5.4mm= 6 x .9mm). This means that DXM#7 will run the same as DKM#1 all the way through the range.
Note: my current EKN#4 has it's taper start nearly the same location as your DXM#4.
Starter jet? I don't mess with it. It starts perfect and doesn't effect anything after the choke is off.
The APJ diaphrams were not available. They never came.
No experiments lately, running the same -
1 turn out
EKN#4 (same as EMN#5) (and sometimes a FMN#5 modified needle)
45-55 deg F
YZ exhaust with a screen in it for S/A (a little restricitve on top end)
Air box lid removed
Fires off easy, rips hard through the mid, top is OK.
[This message has been edited by James Dean (edited 01-09-2001).]
Posted January 23, 2001 - 02:37 PM
my DXM is on the 6th clip accoding to my diary. that's the same as your DSM on 4th.
will be trying the EKP very soon but for it to take over from the 'DSM' (if i had one!) the EKP will have to be on clip 1!
that also dangles the EKP down an extra 7mm or so, making it even leaner on near full throttle.
anyway i'll try it.
went back to standard 45 pilot, far beter straight away. 1 3/4 turns out at the moment.
had the slide cutaway done. 0.3mm off, will try it some time, but i must cut the jetting down as much as i can for valid results.
Posted January 31, 2001 - 08:43 PM
The equivalent codes-
The middle letter is not directly referring to where the taper starts, so EKP will need a clip of #3 or #4 to be close to your DXM#6.
Example - Last summer a friend with a '99WR swapped a DTM#3 to a EKN#3 and changed NOTHING ELSE. (The tapers start at nearly the same place on these.) It worked perfectly with a boost to his mid-throttle power. EKP is closest to EKN.
This leads me to suggest trying either EKP#3 or EKP#4.
(Note for others: absolutely DO NOT run an EVP needle, way too lean)
Posted September 19, 2014 - 06:04 AM
That was amazing post.packed full of hard to get info.
Thanks for demystifying the needle code.it can be very confusing.
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Edited by Stitchyg, November 07, 2014 - 01:44 PM.
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