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


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  #11  
Old 04-21-2012, 12:01 PM
pHreaC pHreaC is offline
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Just installed the N3CW needle on 2nd clip.
This is giving a lot less spooge, the 'hit' is also gone, probably due to the thicker bottom of the needle. It really is a very different needle compared to the N1EF.

Starting isn't as easy as it was, need to crack the throttle in order to start the bike where before I only had to pull the choke lever. Not sure if the air screw is ok, don't really notice a difference between 1 turn or 2 turns out.

grtz

pHreaC


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  #12  
Old 04-21-2012, 05:36 PM
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Jakobi Jakobi is offline
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Just for your info,

The N3CW at pos 2 is significantly (up to 20%) leaner than the N1EF#3. Thats a pretty big jump to take, and you might have been happier starting in clip 3 or 4 and then leaning off to find your ideal setting. The N3xx also has a fat tip as you know, and requires a size or 2 larger on the main than you'd use with the N1EF.

For the idle and air screw, you need to back the idle adjustment screw down before the air screw will come into action. I found with the stock N1EF and a 42 that the slide was lifted quite a bit using the idle screw (turned in until the spring was fully compressed).
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  #13  
Old 04-21-2012, 07:27 PM
thumperrider1 thumperrider1 is offline
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Quote:
Originally Posted by Jakobi View Post
Just wondering what clip position you ended up in? Temp and elevation also. Thx
I think I'm at clip 3 right now. It's 60-80F right now. 0-1200ft elevations.

I may try one of the N3Ex N3Cx for the more open stuff. Any recommendations?
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  #14  
Old 04-21-2012, 09:21 PM
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Thanks. Just for comparisons with some bikes here. Wence dropped the NECW into his 2012 at clip 2 with a 42 and 175. Definately still a bit rich off idle, but on the needle sounds crisp as. Believe he's closer to 90/95F though.

I personally find that the N3Ex and NEDx cross over pretty evenly clip for clip.
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  #15  
Old 04-22-2012, 12:33 PM
pHreaC pHreaC is offline
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Went for a ride today with the N3CW at clip 2, air screw 1.5 turns open. Engine is not smoking at all, when reading the spark plug it is a light tan brown...
Maybe a bit on the lean side, however I have ordered a N3CJ needle and I will probaly be installing this in the 3rd clip. Not sure if I will have to go smaller on the main jet, it is 175 now but am thinking about switching it to 170-172. I don't ride a whole lot of long stretches.

First will try the new needle on 3 and we will go from there.

Bike is a bit harder to start now, any suggestions to fix this?

thx

pHreaC
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  #16  
Old 04-22-2012, 04:59 PM
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Cold starting or hot starting harder?

You never mentioned what elevation you're running at either.

To get the bike to start well and idle well you'll want to follow the normal 2T jetting 101 to set up the pilot circuit. Start leaning out the Air screw for the best idle and response. If things haven't improved by 2.5 turns out go to the next leanest pilot and try again.

My findings are that the newer bikes like either 38/H 40/W 42/J. Richer should still run fine with some burbling before coming onto the needle. Lifting the slide (opening the throttle) leans things out which will get it to start again. While on this tangent you'll find very little difference between the N3CJ and N3CW. About the same difference that a change in pilot jet would make.
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  #17  
Old 04-22-2012, 11:07 PM
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To the OP:
You mentioned a desire for better mileage. Cleaning up the jetting is a start, but I had to raise my float height about 1.5-2mm in order to get an appreciable gain in mileage.

Also, I have always had to whack the throttle to get my two-strokes started.
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  #18  
Old 04-23-2012, 01:26 AM
pHreaC pHreaC is offline
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I ride at sealevel.
And it's the cold starting that has gotten a bit worse than before, I need to open the throttle in order to get her going.

Since the airscrew doesn't do much, perhaps I should go leaner on the PJ as well...

38PJ
170main
and N3CJ needle on 3

sounds about right?
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  #19  
Old 04-23-2012, 04:30 AM
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Nup... You're going about it all wrong and stabbing in the dark.

42 N3CJ#3 178

Set the float level as well. They are renound for being too high from the factory. See Ando's thread for pics.

Tune the idle circuit until the bike will idle on its own, and starts easily. As Ando said, its not ununsual at all for a 2T to like a bit of throttle when starting (when up to temp). Cold start I just use the choke and it fires. The 42 pilot and the J diameter will get you very close. Set the air screw at 1.5 turns from fully closed. Set the idle screw at a setting it will idle, and then back it down to a point where it will sustain an idle on its own. Fine tune the AS until you get best idle. DONE! (Make sure the bike is up to running temp before you set this)

Then.. Work on clip position! Ride the bike between 1/4 throttle and 3/4 throttle. Mark the throttle out with a texta/nico so you know where you're holding it. If the bike starts to burble up and doesn't want to rev clean then you're rich. Move the clip up 1 position. Ride again. You'll find the clip position that feels the most responsive and best power. If you go to far you'll start to get flat mushy power (like when the bike isn't warmed up), hesitation when opening the throttle, pinging, excess heat, and a white spark plug. The signs are there for you to read. DONE!!! I recommend going richer on purpose just to highlight the effect you're trying to avoid.

And finally, run a 5 second under load WIDE OPEN THROTTLE. I usually do it just out the front of home cause I have a slight incline. Punch it into 4th/5th gear at walking pace WOT and let the engine work. Pull the clutch and hit the kill switch at the same time. Pull the spark plug out (make sure not to try and start it or turn it over at all) and read the plug. Few different methods to doing this and thats a topic in itself. Then adjust as required up/down a size at a time and repeat process. PS. Both steps above can technically be done without a main jet at all, although it will make some difference right across the board its not enough to change too much.
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  #20  
Old 04-23-2012, 04:49 AM
pHreaC pHreaC is offline
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So according your findings I should not go leaner on main and PJ. (richer even!?)

Now I'm totally confused...

I have a 42 PJ now, on which the bike feels ok, but I can't notice the air screw doing anything with it being up to 3 turns out, thus I thought it was rich, and leaning it out would be better
a 175 which isn't all that important to me since I don't ride full throttle
and the needle I was going to set on 3rd, so we agree on this one

I've searched the KTM EXC300 on this as well, and they suggest
main 162-165 (which is a whole lot leaner than mine)
PJ 35-38 (leaner as well)
needle N84K #2clip (probably leaner than N3CJ on #3)
but this is a 36mm carb, which means higher velocity, thus more venturi, thus more sucking out fuel, thus on my 38 slightly richer to compare

wouldn't this imply that I should go leaner instead of richer???
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