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


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  #1  
Old 07-29-2012, 04:57 AM
richardexclaim richardexclaim is offline
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Default Help... 2012 EC 300 jetting settings...

Hi all,

Please help...

We are riding in the Troodos Mountains of Cyprus between 600m - 1,800m, with temps at 25c - 35c. ( www.ExclaimTours.com )

The 2012 EC 300 is running rich at standard settings (175, 42PJ, N1EF Needle at #3, 1 turn out). So tried yesterday 165, 42PJ, N1EF at #2, 2 turns out (as per manual setting chart).

Still not great. Tried 2.5 turns out, which improved lower down response... but still not as sweet as our 2010 EC 300 Six Days.

Help : What needle do I need to lean off from the standard N1EF needle.

All advice would be greatly appreciated...

Many thanks,

Richard



Last edited by richardexclaim; 07-29-2012 at 12:23 PM.
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  #2  
Old 07-29-2012, 01:42 PM
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andoman andoman is offline
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You are very close to me in temps and altitude.
My 2011 EC300 is jetted with:
172 main
N3CH needle #2
38 pilot.
But I stay at and above 1500M, you may feel better at 40 pilot, #3 clip and even perhaps even a 175 main if you are pushing hard at the lower end of the altitude range you listed.
In any case: toss that worthless N1EF needle. If needle availability is an issue, grab which ever stock 250 KTM, Kawi, Suzuki, or Yamaha needle you can find and after a couple of quick experimentation swaps of mains from 172 -178 you'll be close enough to be much happier than you are now...
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Old 07-29-2012, 04:26 PM
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Jakobi Jakobi is offline
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Alternatively you could try a leaner diameter needle as well if you find the H a bit burbly. Others have had success with their 2012's using the N3CJ paired up with a 42 pilot.

You can also order optional half clip richer needle N3Ex to really fine tune it in. One Australian dealer is jetting their 2012 models with 40 N3EH#3 178 for sea level here.

Suzuki needles NEDx and NECx also work well for a very clean and linear response but I personally find them a bit unexciting for my riding style. A quick search in the 2T jetting section will have you well and truly informed. Then you always have the JD jetting route as well which many have had success with too.
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Old 08-01-2012, 09:24 AM
richardexclaim richardexclaim is offline
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Default Where to order N3CH jet needles online in the UK?

Thanks guys,

Really appreciate the input.

Now am I being stupid... I can't find a N3CH needle to buy online in the UK anywhere? Including Ebay...

Who makes them?

Where can I order from?

Help!!!!!!!
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Old 08-01-2012, 01:29 PM
GasTimppa GasTimppa is offline
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Try your local Orange bike dealer.
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There is no such thing as bad weather! Only riding gear is improper or insufficient

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Gas Gas EC 300 Factory Racing 2012
- Ohlins TTX both front and rear
- Rekluse Core EXP 2.0 + Rekluse clutch basket
- Scalvini full exhaust system
- S3 Head
- Trusty adjustable PV cover

That was ultimate setup for me...
Now trying something else for a while...
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Old 08-01-2012, 02:02 PM
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Jakobi Jakobi is offline
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N3CH Part numbers
Yamaha: 4SR-14916-CH-00 NEEDLE,(N3CH)
KTM: 54731034000

Available through either coloured dealers.
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  #7  
Old 09-17-2012, 06:20 AM
richardexclaim richardexclaim is offline
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Default Not a jetting issue... sticky power valve

Thanks all.

After trying numerous permutations and combinations (38, 40, N3CH, N1EG, 165, 168, 170, etc etc) it turns out that the problem was due to a sticky power valve!!!

Thanks though... I now know nearly everything there is to know about jetting.

Best Richard (www.ExclaimTours.com)
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Old 09-17-2012, 06:26 AM
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Jakobi Jakobi is offline
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That'll do it!

So what jetting did you settle on once you got the powervalve in order?
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Old 10-03-2012, 03:36 PM
fr.yoav fr.yoav is offline
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How can I find out if I have a sticky valve issue or jetting adjustment ?
I have the same problems
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Old 10-03-2012, 06:22 PM
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Its easy to check. If its the powervalve its more likely to be an intermittant issue. Jetting should pretty much run poorly any time you run in certain conditions.

To check the action of the powervalve remove the pipe, the RHS pv cover, put pipe back on and run the bike on the stand. You will be able to see the powervalve move with the revs. You can also disconnect the actuator arm and check that the plate rotates freely. Check the freeplay while you're in there. Whatever you do though, don't roll it around with the arm attached, or pull up on the arm. You can dislodge a ball in the governor.

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