hello quys
I went before some days to my Honda dealer in Athens,Greece(Gelagotis for the Greek guys which will ask)to pick up some orders and when i asked him if he has any HRC parts in stock for my bike,he opened an old drawer and told me that he has something which wait for a buyer almost for 20 years and he believes that it is a garbage and no one will buy it LOL and he showed me an HRC bag that i didnt believe in my eyes.Finally the bag was an HRC jet kit for MC21 which he wrote outside with marker this code 16020-NKD.He has sold seperatly only the main jets and the other parts which i check it with my HRC mc21 manual are inside:A/B/C needles,emulsion tubes,needles holders,needles clips,X and Y air solenoids,slow jets.
I dont care for the main jets i can order them from the Keihin Sudco dealer in Athens,Greece.
The questions are which HRC kit i have?
Because the bag does not have the full code as i think,cause the full code on my HRC mc21 manual has this code:16020-nkd-751 as a complete jet kit.
The kit contains and this part inside with code:99105-NKD1300 which it looks like an air jet and i can not understand where it goes and what it does.

The part which i dont know what it is and was included in to the kit with code 99105-nkd1300 dont exist on the mc21 HRC manual which i am looking at.

A photo of the part which included in to the kit and i dont know what it is http://imageshack.us/photo/my-images/836/airjet.jpg/

A photo of the magic bag http://img138.imageshack.us/img138/386/10032012126.jpg

No one know anything about this little jet?
http://imageshack.us/photo/my-images/836/airjet.jpg/

There are several versions of each manual... some more comprehensive than others. I have three MC28 HRC setup/parts manuals alone!

The jet is indeed classified as an "Air jet #130" in, I believe, the 1992 HRC Manual. I cannot tell you for sure where it is used, but I expect it is to replace either the single jet in the OEM X-piece, or one of the two jets in the OEM Y-piece.
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Andy.
NSR-WORLD.COM

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So Andy do you know if the first jet kits that appeared in the market for NSR's if they dont include the X and Y solenoids and only give these kind of jets to fix the oem solenoids?The kit which i bought has the X and the Y solenoids inside.
I saw the manual of my Honda dealer the moment i bought the jet kit and in the diagram it looks that this air jet is placed beside the emulsion tube on the carb flowt.
As i said and in the first post,my dealer says that this jet kit was a 20 years old forgotten order for a racer in the early 90s and i am little comfused with this jet kit,i want to know which exactly kit i have,for what use.
I feel very very lucky for the jet kit i should have play a LOTTO that day because i bought it and in the correct Honda old price ,not the discontinued double and triple price which all they sell them as used
I will go to my dealer and i will ask him if he has the full code in his pc of the kit which i purchased and i will take a photo the HRC diagram that he has and i will upload it.
Thanks

Well, I've often wondered if it was to replace the pressed-in "jet" in the float chamber, but have also wondered why (a) it's called an "air jet" in the manual if it's in the float bowl, and (b) why there is only one, unless it's to richen/weaken the fuelling to only one cylinder. (This is why I've often suspected it to be a replacement for one of the X/Y-piece jets.)

Whatever it is, we've never had reason to require it! Maybe if I physically saw one in real life, I would be more able to answer the question. As it is though, I wouldn't lose any sleep over what it is or what it's used for! As I say, it's only shown in one version of the MC21 manual... the least common version in my experience. I can safely say that I know of no-one who has utilised it.

I'm not saying it's useless, but I am saying that I expect what it does can effectively be masked with a different SJ/MJ/PWJ/JN/AS setup, which is probably why it was only made available for one year.
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Andy.
NSR-WORLD.COM

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Hi to everyone
I notice that the HRC mc21 manual of the forum says that you have to blank with epoxy glue the power jet fuel intake(tube). http://www.nsr250.net/forums/members/web_manual_mc21_hrc/titanium/index.php

The question is,you have to do it and if you have install the (blank)power jets?Will it have any result if you blank with epoxy the tube and install and the blank power jets?
Because i notide that the HRC manual of the forum is a version with no blank power jets.

If you have fitted the power jet blanks you do not need to block the tubes.
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If I have to take the carbs off once more...

I also believe that Stephen but i wanted to make sure,you never know!!
thanks for reply

I seem to remember in the dim and distant past a set of intructions that came with a M- Max box I bought for my MC21. The instructions were for set up of the M-Max box but they also had info regarding the installation and set up of the HRC jet kit. I'm pretty sure the small jet in question is to replace the jet in the black 'Y' piece, as Andy has mentioned. I do have the instructions somewhere and actually had the intructions translated into english.

I also have the HRC manual in pdf that shows this jet with the correct code somewhere in the float near to the emulsion tube but it is not very specified.
I dont understand if it is for pressing it near the emulsion tube to the power jet tube as Andy said why it is only one including at the kit and the HRC manual as the NSR has two carbs?
The other way,why HRC include this jet for repalce to the Y solenoid if the kit has already the HRC Y and X solenoids inside ready with the correct jets?It doesnt make sense.
I will go tommorow to my Honda dealer to get some orders and i will take a photo from his manual who include also this jet in the diagram somewhere in the float to take a look.
Thanks for the interest