air screw doesnt afected RPM

[Jakobi]

You could try a few sizes smaller on the pilot to lean the mixture while dropping the idle scerew back down once it comes into effect. With this approach I found I would then get the pilot right but still have a rich burble at 1/8 throttle from the rich needle diameter. Thats why we have suggested a leaner diameter with a bigger pilot.

As for needles if you like the deliver and power you already have could try a N1EI (I haven't tried this) An NOZI/NOZJ (one I really want to try). NEDW/NEDJ (Suzki needles smooth power). N3EW/N3EJ (Yamaha snappy power).

[drn51]

Thanks Jakobi.

This is the second time i heard good thing about the NEDJ for smoth power.


In the web i find only at USA with limited shipment.

any recomended place to order at Europe?

[Jakobi]

Any suzuki dealer

Might be a few week back order out of Japan but they sure can get them for you

[nelly001]

hello i too have a problem with no idle on a 2008 250 ec n1ef top clip idle screw all the way in.i have ordered a nedj needle to replace the n1ef do i need to go bigger on the pilot or smaller to get it to idle.currently running a 40 pilot and 178 main.runs ok but no idle.what im getting at is an nedj leaner than a n1ef.

[Jakobi]

I would have probably got an NEDH/NEDW for a 250. The J diameter will work, its just leaner. The needle is quite a bit leaner on the straight section. Quite a bit leaner in the first taper and then runs about the same as the N1EF through mid to WOT.

I'd probably suggest a 48/45 pilot to start with. I run a 42 with a J in my 300 which will pull more fuel through the jets due to a larger vacuum from the bigger piston.

[nelly001]

my mistake.what would be your recomended needle or do you think the nedj would be safe to use.

[Jakobi]

It'll be safe mate.

The diameter is only in effect from 0 - 1/8th throttle which overlaps or pairs up with the pilot.

I'd start the 45 NEDJ#3 175 and adjust from there as required. Listen to the engine and it will tell you what it needs.

[nelly001]

thanks mate im still learning the jetting game not hads a 2 stroke for a couple of years.just want to get it to idle nicely and work from there.thanks for your help

[Jakobi]

If you throw it together with the new pilot and needle with the slide in the same spot you'll notice it will rev really high, particularly after a blip of the throttle. Don't immediately freak out. Just keep backing the idle screw back until it wants to stall and then back in some.

If you have the idle screw wound all the way in with the N1EF that indicates that the fuel mixture at idle is far too rich so you lift the slide to alow more air. The problem is after a certain point you come off the straight section onto the needle taper which is why you then get such an intermittent idle.

Looking down the carb throat with the slide in you should be able to see only a small window between the bottom and the slide. Say 2 or 3mm

[nelly001]

ok thanks i wont get the needle until next week so i will have to reassemble it so i can race it thit sunday.