Factory Needle/Jet Setting EC250

[webmaster]

Start out by switching out the needle - yamaha yz needle or leaner n3ew, etc. And with correct needle - pilot should be richer on the pilot (42/45/48) indicating you have good separation of the carb circuits. Back out idle screw and air screw should be at 2 turns or so and should be "effective" - e.g. you should be able to adjust it and see some effect.

With the stock n1ef needle - "you can't get there from here"...

jeff

[theexception_03]

Thanks to everyone for their suggestions and info, it has really helped me to make a few changes and experiment with the settings. I should get the bike back from the shop this week and will let you know what works best

Thanks again!

[stainlesscycle]

Originally Posted by webmaster

With the stock n1ef needle - "you can't get there from here"...

jeff

i have no problems with n1eg on a 300. maybe the 250 wouldn't like it. a little snappy at 0-1/4 but i kinda like it that way. teaches throttle control

[Jakobi]

Originally Posted by stainlesscycle

i have no problems with n1eg on a 300. maybe the 250 wouldn't like it. a little snappy at 0-1/4 but i kinda like it that way. teaches throttle control

My bike will run with N1EF/N1EG as well. It just drinks alot of fuel and will load up if chugged around off idle too long. IE rainy wet days. The snap off idle comes from the rich-lean transition off the first taper into the second. It can be achieved by running a rich pilot and needle diameter with any needle in a lean position. To be honest I think the N1E/NOZ would actually do better in the 250 than the 300 as they tend to like a bit richer jetting (or thats what I have noticed with mine - Same bottom end, same trails, same conditions).

[stainlesscycle]

Originally Posted by Jakobi

My bike will run with N1EF/N1EG as well. It just drinks alot of fuel and will load up if chugged around off idle too long. .

i've not had a problem with it loading up and i did 2:30 today without even hitting reserve.....and there were lots of open fields where i ran outta gears... i thought for sure i'd hit reserve..
42, #2, 172, n1eg, 1.5 - it's snappy enough i gotta be careful for sure - can't really use 1st gear at all.. but it idles and doesn't stall out, so i'm happy with the jetting

[Jakobi]

Can't ask for much more than that Stainless. There are definately quite a few variables involved and we're often reminded what works for one doesn't always work for another. I'd have to imagine the stock jetting would be close, at least in Spain. Some people have been happy with it in their 2011 and 2012 models. Others have found better solutions.. It all comes down to trial and error, and at the end of the day the best you've had is the best you try.

[GMP]

I always put my bike on reserve at the start, don't wan't to have to reach down at a bad time IF I should run low.

[stainlesscycle]

Originally Posted by stainlesscycle

i've not had a problem with it loading up and i did 2:30 today without even hitting reserve.....and there were lots of open fields where i ran outta gears... i thought for sure i'd hit reserve..
42, #2, 172, n1eg, 1.5 - it's snappy enough i gotta be careful for sure - can't really use 1st gear at all.. but it idles and doesn't stall out, so i'm happy with the jetting

i failed to mention i'm running 50/50 92/112 - that may be a factor in my fuel economy and definitely in jetting/how it runs overall. so i would think ymmv..

[stainlesscycle]

Originally Posted by GMP

I always put my bike on reserve at the start, don't wan't to have to reach down at a bad time IF I should run low.

i've considered it, just never done it - i'd rather take the 10 seconds/pull of course to switch then be totally stranded. i think i'd be stranded either way, i stopped carrying extra fuel can completely - only doing 2 hour races this year.

[GMP]

Yeah, in harescrambles why not do it? In enduros, it may give you a warning to bum gas off the next check crew to get by, plus you have a lot more time to fiddle with the petcock. Sometimes its hard to find a good place to grab my mouthpiece for a drink much less reach down for the petcock. It wouldn't matter anyway though usually, Sunday I had at least a gallon left, lots of throttle control and finesse though less wide open stuff. I'm only doing a couple enduros this year, doing more harescrambles as I seem to be doing very well in them.