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I´m having a needle issue. Modified CRF250R 2009 engine and I need to change different needle. Is there any translator what Honda needle codes mean?
Example stock needle is NNTU. What are specs? Keihin uses own codes which seems to be different. Anyone can help? I can order from honda too needles but catalog only inform their codes.

Cheers,

Timo

ok, maybe this will help. page 127 talks about standard jetting and altitude. page 128 talks about a modified engine.

http://www.hondamc.com/upload/Download/CRF250R9%20Instruktionsbok.pdf

I'd highly recommend getting the JD Jetting Kit. It includes two needles that have been custom tapered specifically for the CRF250R. Here's a link:

http://www.crfsonly.com/catalog/product ... ts_id/2657

ken

Thanks but those wont really help me. I have Honda manual and it tells NNTU is right needle but it´s not.
I have right jetting allready so I don´t want to spend money for JD Jetting Kit because it´s not sure that it will work.
I know what I need when I see information about NNTU needle but it´s difficult to measure needle accurately.
I drive enduro and my 2009 CRF250R has lower compression ratio then stock and different camshaft timing. Engine is milder and not so much snap on it then stock. Power comes up in lower rpm. So that´s why the needle problem.

- Timo

Email or call the shogun, James Dean himself. He is a nice guy and can probably help you without trying to sell you something. If you can't find what you need by checking the forum, googling it, or calling your local dealer, that is my suggestion.

OK Timo,

here's how the lettering system works. Let's compare two commonly used needles in the CRF's, the NCVS and the NCVU.

The NCVU is leaner than the NCVS.

The lettering system works like this:

After the N, the first letter is the taper. "C" so they are both the same taper.

The second letter is the clip postion relative to the top portion of the taper. They are both V. They get leaner as you go up thru the alphabet towards Z.

The third letter is the needle straight diameter.The S is richer than the U. They also get leaner as you go up thru the alphabet towards Z.

Hope that helps.

or... AS can answer.

All I ever wanted to know Thanks a lot all of you!

- Timo

Ok no I´m buying NNTS needle place of NNTU.

If we compare NNTS needle and AS mensioned NCVS needle result is.

NNTS taper angle is bigger than NCVS

NNTS length diameter is smaller than NCVS

NNTS needle straight diameter is the same than NCVS

Does all those Honda CRF needles fit apart? If I rememer right older CRF´s have little bit different FCR Keihin on it.

The older needles will fit the newer carbs without issue.

The newer needles will need the new holder assy to fit the older carbs.

Since you have an 09, any needle will fit without issue.

Cheers! I believe right setup will find now.

- Timo