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


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  #21  
Old 01-10-2016, 03:11 PM
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yamaha 4SR-14916-CH-00
or KTM part number: 54731034000 (alternate for most years 250/300EXC)

I found our local Yamaha dealer wanted twice as much for the same piece. Shop around. In the states they go as cheap as $10.


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  #22  
Old 11-18-2016, 03:47 PM
adriano.ro adriano.ro is offline
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I've been trying to jetting my ec 250 FR 2014. So far I have used different needles N1EF ,N2ZJ and now N3CW. My plan is to take maximum torque from carb. N1EF is rubbish, next is N2ZJ was good with 42 #3 and 175,but not very special on bottom end. N3CW pulls good from bottom,but only with 45 pilot and 178 main, if I go down on pilot ,quick acceleration will result in BOO AAAA! In teory witch needle will give max torqe and witch one will give best consumption?
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  #23  
Old 01-02-2017, 03:12 AM
VilluEST VilluEST is offline
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Originally Posted by adriano.ro View Post
I've been trying to jetting my ec 250 FR 2014. So far I have used different needles N1EF ,N2ZJ and now N3CW. My plan is to take maximum torque from carb. N1EF is rubbish, next is N2ZJ was good with 42 #3 and 175,but not very special on bottom end. N3CW pulls good from bottom,but only with 45 pilot and 178 main, if I go down on pilot ,quick acceleration will result in BOO AAAA! In teory witch needle will give max torqe and witch one will give best consumption?
I had the same question with my 250R (ASII). Currently it has 182 main, 42 pilot, N3CJ on third clip and 7. slide (stock). It feels a bit rich around idle and very low RPM's when it's hot (over 25C) and I'm riding slow difficult track, so I have to turn out the air screw more. The dealer told me that if anything, he would go to slide no6. I'm quite happy with it, it has good torque and it's quite economic too, about 150km of easy riding before having to turn to reserve or 120km harder trails.
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  #24  
Old 01-02-2017, 05:49 AM
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Quote:
Originally Posted by adriano.ro View Post
I've been trying to jetting my ec 250 FR 2014. So far I have used different needles N1EF ,N2ZJ and now N3CW. My plan is to take maximum torque from carb. N1EF is rubbish, next is N2ZJ was good with 42 #3 and 175,but not very special on bottom end. N3CW pulls good from bottom,but only with 45 pilot and 178 main, if I go down on pilot ,quick acceleration will result in BOO AAAA! In teory witch needle will give max torqe and witch one will give best consumption?
Try the suzuki needles... NECW or smg... smaller jets, best linear torque but no boom and top revs... might be best for consumption too...

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I'm quite happy with it, it has good torque and it's quite economic too, about 150km of easy riding before having to turn to reserve or 120km harder trails.
you're kiddin right? sounds like a keeper.... 150km
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  #25  
Old 01-03-2017, 05:02 AM
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150km out of a tank seems a bit of a stretch eh

In saying that, I routinely get over 100kms out of my 9.5L. Have a mate with a 15 250R, running the same jetting over the same loops, at the same pace. A few times now he's chewed through an extra litre and had to borrow 1/2 a litre more to get back while I haven't even touched reserve. He's also running taller gearing (a tooth less on the rear).
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  #26  
Old 01-03-2017, 06:14 AM
VilluEST VilluEST is offline
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Yes well, I'm quite gumbie too, that's why I get so long range. The 150 km is really easy track, like gravel trails in woods etc and not roosting in every corner, also no WOT for long times. I'm not very aggressive rider so I tend to take things softer and slower.
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  #27  
Old 02-15-2017, 03:28 PM
adriano.ro adriano.ro is offline
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After some rides I'm so confuse, N2ZJ@3 42,180 pulls hard only from bottom with no top end, N3CW@3 45,180 will be ok after 1/2 part. Very few information about 250 2014-... jetting chart. In teory witch needle is for this bike H,W,J ?
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  #28  
Old 02-15-2017, 05:05 PM
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In 1/2 clip variations from leanest to richest they are...
N89x=leanest
N3Cx
N3Ex
N8Rx
N2Zx
N4Dx
N3Vx
N4Ax
N6Mx=richest

The N2ZJ is running a full clip and a half richer than the other. You're also using a leaner pilot with the leaner needle diameter, which may/may not be improving the bottom end response.

You need to be methodical and compare apples to apples.

The 14 250 I setup runs 42 NEDW#2 175 and gets good fuel economy and line linear power.

With N3CW@3 45,180 you say it's OK after half throttle, but what is happening on the bottom end? Flat lacking power, or rough burble? I'd be inclined to drop to a 42/40 pilot, and see if it helps.
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  #29  
Old 02-15-2017, 09:25 PM
adriano.ro adriano.ro is offline
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Flat power delivery,especially on quick throttle opening,clean sound,no burble. So 40 pilot will be to lean=to flat, I think.
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  #30  
Old 02-15-2017, 09:41 PM
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Alright, so why not try somewhere in between and see how it goes? Like N2ZJ#2? What results did that give?? (assuming you've already done this).

Or N3CW#4

If the 42 N2ZJ#3 gives good response off the bottom but no mid, have you tried leaning the main off a couple sizes to see if it helps?
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