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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#1
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question about stock jetting
Hi ppls
my bike 2005 EC250 comes with a N1EF 185 mj 38pj A/S ?? the question I have is why the book recommends this setup, a lean pj with a rich main, when most of the time the bike runs so much better with a richer pilot and a leaner main. This is my set up at the moment NEDW#2 180mj 45pj A/S 2.75 riding at sea level 20'C I am even considering chopping down the MJ to 178....got my first test today on an open flat track. lots of 1/2 to WOT there! |
#2
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Im sure Jake will chime in.....but from my understanding its that needle I just replaced mine with a N3CJ. Im referring to the N1EF.
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06 KFX 400/ Kdx soon- Wifey 03 KX 65(sold)/ 04 YZ 105- Son 10 YZ 450(sold)/ 12 EC 300 (GG) STREET_ GTR 1400 (The Connie) 93 KDX 200 (Katie) |
#3
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Have you had a chance to flog it, yet? If so...How is it? I guess I could just use the the phone & ask
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All healed up, and ready to burn some fat. |
#4
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just got the 2013, and it only likes to idle with the choke on...
it has a 42 PJ and a 175 MJ.
I am running my '11 with 178, but darned if I can remember the PJ size. if it wants to run with the choke on, that means that I am running too lean, right? so maybe a 48 PJ? I was hoping to get an early start tomorrow, but it looks like I need to make a run by the KTM shop and see if they have some PJs in stock. Am I on the right track, it has been too long for my old head. Rob
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Rob Granger / Katy, TX EC300 Breaking more things by 8:00AM than most people break all day. |
#5
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rats! supposed to be in a new thread! see, bad brain.. bad brain!
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Rob Granger / Katy, TX EC300 Breaking more things by 8:00AM than most people break all day. |
#6
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Quote:
Quote:
The reason you have noticed the changes in the pilots are because of the needles. The needle diameters from rich to lean go something like E, F, G, H, I/W, J, K, L... The stock needle was an F, and you're now running a W. So you're about 3 steps leaner on the needle diameter (idle circuit), and you've also gone 3 steps richer on the pilot jet (from 38 - 45) so it kind of all balances out. Depending on your carb model and bike, some like the richer diameters, others like the leaner. I personally find that a rich diameter will break up alot around 1/8th - 1/4 throttle even with a lean pilot that bogs when you crack the throttle. A lean needle diameter will respond better to richer pilots, but you can still get a rich condition that won't idle, but will bog or fall flat when cracking the throttle under load. Its about finding which works and which doesn't. On newer AS2 carbs with the NEDW needle I'd happily run a 172 main for your conditions. I'd say a 178 will be safe for you. You might even end up at 175 yet. |
#7
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No Test as of yet.....Jakobi Still need to grab a 178Main and figure out tank sealing problem. Other than that got the air box all sealed up and a filter oiled and ready to go in. Going to run it down the block warm it up to dump the oil then hopefully Ill get a chance to go riding soon. I have a feeling this is going to hit hard.
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06 KFX 400/ Kdx soon- Wifey 03 KX 65(sold)/ 04 YZ 105- Son 10 YZ 450(sold)/ 12 EC 300 (GG) STREET_ GTR 1400 (The Connie) 93 KDX 200 (Katie) |
#8
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I'll be waiting to hear all about it!
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#9
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Quote:
it went ok today but your on the money with it breaking up around 1/8 to 1/4 once I got to 1/2 - WOT it was singing what needle has a leaner straight section? compared to the NEDW? |
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