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


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  #1  
Old 12-07-2010, 07:11 PM
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JP4 JP4 is offline
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Default 2010 EC300 Factory Jetting Specs - WTF?

I posted before about a new 2010 EC300 that I recently took deliver of. I've had a chance to plow into the carb and here are the factory settings:

Slide: #7
Needle: N1EF - Top clip (leanest)
Main: 175
Pilot Jet: 40
Air Screw: 5 1/4 out

WTF? Kinda seems like they just bolted on the carb as it came out of the box from Japan with no thought as to set-up for the bike or where it was going. The needle clip and air screw settings make no sense.

Based on my searches on this site and my locale (600' ASL, average riding temp 20C) I think it's way lean. I've ordered a needle (CCK, it seems a popular choice), and some fatter main and pilot jets. Won't really be able to ride the bike for a few months, as it's pretty much full on winter here at present.

Does it sound like I'm on the right track regarding the jetting?

Jason

Otherwise, I'm super impressed with the bike and can't wait to ride it for real -I'm thinking a trip to Georgia or Florida this winter is gonna be must!


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Old 12-07-2010, 07:17 PM
2whlrcr 2whlrcr is offline
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Go through the jetting data base thread, lots of info in there.
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Old 12-07-2010, 10:07 PM
TNT Cycle TNT Cycle is offline
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Default jetting

my 2010 300 came very similarly jetted, all over the map. It was mighty lean at sea level. Raised needle and fatter pilot and its ok jetting wise. Soon to try some needles to remove crazy lean flat spot in mid-range...

cheers,

Rick
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Old 12-08-2010, 07:42 AM
jeffs2200 jeffs2200 is offline
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My 2011 300 had the same settings, except the airscrew.

I do not find it to be lean at all. I had to go down to a 38 pilot because it was loading up on bottom. I may try a leaner needle and fatter jetting. I think I am going to try the N3CH from my KTM with a 40 or 42 pilot, 3rd clip and maybe try a 178 main and see haw that does.
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Old 12-10-2010, 03:19 AM
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Jeffs. I think you will find the N3CH right on the money with the 40 or 42 pilot. I am running an N3EG in mine. The CH is a half clip leaner, and a step leaner on the 0 - 18th opening.

I have N3EG#1, 38 Pilot, 175 Main. 100M - 500M, 20-30C, 60-100% humidity. Absolutely hauls. Smooth crisp responsive oodles of power from right off idle.. Truely transformed the bike!

Fuel consumption went from hitting reserve at 90km (after adding an extra L of fuel) to 110km reserve off the 9.5L tank.

I wish they all came jetted like this from the factory!
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Old 12-10-2010, 08:00 AM
jeffs2200 jeffs2200 is offline
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Thanks, I will give it a try.
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Old 12-10-2010, 10:43 AM
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No worries Jeff,

I'd be interested to hear if you get the same results.
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Old 12-10-2010, 06:10 PM
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Quote:
Originally Posted by Jakobi View Post
Jeffs. I think you will find the N3CH right on the money with the 40 or 42 pilot. I am running an N3EG in mine. The CH is a half clip leaner, and a step leaner on the 0 - 18th opening.

I have N3EG#1, 38 Pilot, 175 Main. 100M - 500M, 20-30C, 60-100% humidity. Absolutely hauls. Smooth crisp responsive oodles of power from right off idle.. Truely transformed the bike!

Fuel consumption went from hitting reserve at 90km (after adding an extra L of fuel) to 110km reserve off the 9.5L tank.

I wish they all came jetted like this from the factory!
Man o man ... so many needles ..... I've plowed through needle chart comparisions, but without any real time on the bike I'm just guessing.

Ordered a CCK caused it seemed middle of the road ... I think ... trying to get my head around the tapers and lengths, diameters ... not to mention effects on PJ ... eyes glossing over ... how did I ever get through law school?

I read about the KTM needles (N3CH/G et al) but wasn't sure. Maybe too much info ... Who's prepared to venture an opinion and say that they are better or worse for the 300 Gasser at an elevation under 1000' (300M) ASL?

It's a mystery to me so any opinions on the N3 needles would be appreciated.

Guess I'll just bolt up what seems like a reasonable set-up and use that as my base point - I think for 15c (someday it'll be warm!), and 250M ASL this should be safe:

#7 slide
CCK needle -3rd clip
40 pilot
178 main
1 1/2 air screw

Cheers,

Jason
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Old 12-10-2010, 08:51 PM
jeffs2200 jeffs2200 is offline
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I have the N3CH 3rd clip, 40 pilot, 175 main.

I will test Sunday and report back.
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Old 12-11-2010, 05:21 AM
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Quote:
Originally Posted by jeffs2200 View Post
I have the N3CH 3rd clip, 40 pilot, 175 main.

I will test Sunday and report back.
Good luck. Don't be afraid to move the clip up one on the trail just to evaluate.

I found my bike would burble on clip 3, runs well on 2, but 1 was just even better again. So clean and crisp!
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