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  #1  
Old 02-01-2017
Whipped Whipped is offline
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Join Date: Feb 2013
Location: Central Coast
Posts: 36
2012 EC300 jetting frustration.

Hi all,
I've owned my 12' EC300 from new and from day one I have never been able to get the bike jetted the way I like it.
I've tried different types of setups in the past that I've read on DBW and currently running:
N3EH clip 2
180 main
40 pilot
Air screw 1 turn out
Fuel ratio 50:1

What is currently happening is the bike gets very fluffy/burbly at low revs or lugging it and then opens up with big power. Also having some hesitation through the rev range as well causing some surging.

What I'm after is a very smooth, tractable power delivery that will be good for technical riding/hill climb stuff.

Could anyone recommend a setup they have used I could try out that would suite?

Cheers in advance for you help.
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  #2  
Old 02-01-2017
philm philm is offline
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Join Date: Mar 2015
Location: Hunter Valley
Posts: 307
I believe that the N3?? needles give the bike a fairly aggressive power delivery. For smooth you should probably try one of the Suzuki needles like the NEDJ. Jakobi is the Gas Gas jetting guru so check out some of his posts. The NE?? needles are discussed in this thread as well as plenty of others.

http://www.dirtbikeworld.net/forum/s...104718&page=11

This is from one of Jakobi's earlier posts as well........

"I have ran basically all your list

38 N1EF#1 175
40 N3EJ#2 178
40 NEDJ#2 172

N1E was too rich for me. Nice delivery but sucked juiced and spooged in the slow stuff. Loaded up.

N3Ex is agressive delivery. Snappy right off idle and again in the mid/top. Nice hit and mad fun.

NEDx is smooth and linear. Doesn't feel that it has less/more power than the above. It just delivers it differently. Smooth bottom, strong top. No real hit just a mild transition between the two."
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Old 02-01-2017
nocams nocams is online now
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Join Date: Apr 2012
Location: Blue mountains
Posts: 803
I've always run n3cj#3, 178 main, 42 pilot,as 1-1.5 turns out and have a linear power delivery and pretty good economy.
This combo works real nice for me,by the way,I'm using a mk2 pwk.
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Old 02-01-2017
Whipped Whipped is offline
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Thanks guys for your input. I'll try these out and see what it's like cheers
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  #5  
Old 03-01-2017
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tm_nate tm_nate is offline
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Quote:
Originally Posted by nocams View Post
I've always run n3cj#3, 178 main, 42 pilot,as 1-1.5 turns out and have a linear power delivery and pretty good economy.
This combo works real nice for me,by the way,I'm using a mk2 pwk.
That is almost exactly what I stick in them too mate, except 175 main and #2 clip.
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  #6  
Old 03-01-2017
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Jakobi Jakobi is offline
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The 300's prefer a J diameter needle in most cases, where the 250's will go a W.

I'm lucky enough to have 2 engines to play with (both 250's with milled heads, corrected squish and comp ratios similar).

One runs 40 N3CW#3 178, the other 40 NEDW#2 175.

Go leaner on the diameter and you'll clean up your off idle blubber. Go too lean and it'll fall flat, hesitate, and lose torque.

Go richer on the clip, or move to a Suzuki needle that supplies a bit more fuel through the mid. It'll smooth things out.

Main jet will depend on the needle taper profile, but 172-180 should have you in the range. I'd be inclined to sit a bit richer for safety sake.

Make sure you have a BR8EG/X plug. I don't find the irridium ones very good in 2T applications. Gap it to spec. If you haven't take the time to check your squish clearance, it could be the missing piece of the puzzle. Around 1.2-1.3mm is ideal. Odds are it will be well over 2mm from the factory and as such can make it a real challenge getting them to run consistently at small throttle.
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Old 03-01-2017
Whipped Whipped is offline
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Join Date: Feb 2013
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Seems like I have some work to do! I'll make some time to do the squish clearance, looked up some how to's and seems pretty easy, and I have a bunch of BR8EG plugs so I'm sorted for that. One thing I did also read was that the float level might not be helping either so I'll give that a look as well.
Thanks guys, hopefully I will have this sorted soon.
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Old 15-06-2017
Whipped Whipped is offline
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Posts: 36
Hi all,
What's the best way and settings to set the float level on the pwk 38 AS2?
The carb is coming off the bike this weekend so thought I'd do it then.
Cheers.


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  #9  
Old 15-06-2017
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Jakobi Jakobi is offline
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Quote:
Originally Posted by Whipped View Post
Hi all,
What's the best way and settings to set the float level on the pwk 38 AS2?
The carb is coming off the bike this weekend so thought I'd do it then.
Cheers.


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