Looking to get some different needles and jets, but am having a hard time finding the type of needles they come with. This is for a AA set of carbs

I'm going here for the Jets and Needles, lots of good info on jetting but can't find what kind of needles we have.

Do you want aftermarket, standard or hrc needles?

The standard needles can't be bought from Keihin and they don't offer alternatives.

The NC29 needles should have a code stamped into them - this is a honda part reference nothing to do with Keihin.

Well since they are Keihin carbs I would assume they have Keihin needles. And yes you can buy Keihin needles...
http://www.jetsrus.com/a_jets_by_carbur ... ction.html

cajun wrote:Well since they are Keihin carbs I would assume they have Keihin needles. And yes you can buy Keihin needles...

You can get Keihin needles, but they are specific to carb models, not bike models. NC29 OE needles are a Keihin needle with a Honda part number = you get them from Honda, not Keihin.

Bump.... Only because I believe the question in this thread got lost in translation some where. What I was asking was which needle "would" fit. I am looking for a thinner needle supplying more fuel than stock.

The reason is I have the dynojet kit fitted but the needles are too lean. Had the bike dyno'd with the Ram air with dnyojet needles with the clip in position 5 and 108's and it had a paltry 56hp. But the A/F ratio was 16 and 17 to 1 from 8k up. So I went to 116's with the stock needles that I sanded a few thousands of a inch off of with 3 washers which made it a little better but still need to go back to the dyno and see how much.

Think I'm going to have to run something like 120's with thinner needles.

cajun wrote:Bump.... Only because I believe the question in this thread got lost in translation some where. What I was asking was which needle "would" fit. I am looking for a thinner needle supplying more fuel than stock.

Ok, well needles from some other keihin carbs will fit. RVF400 would be a logical choice to try because they use essentially the same carb bodies as the nc29. Needles from keihin (your link above) won't fit these carbs.

It sounds like you just need bigger main jets to me.

Cammo wrote:

cajun wrote:Bump.... Only because I believe the question in this thread got lost in translation some where. What I was asking was which needle "would" fit. I am looking for a thinner needle supplying more fuel than stock.

Ok, well needles from some other keihin carbs will fit. RVF400 would be a logical choice to try because they use essentially the same carb bodies as the nc29. Needles from keihin (your link above) won't fit these carbs.

It sounds like you just need bigger main jets to me.

Ok so you're telling me that NONE of those would work???

And as luck would have it I have A-B-C set of NC35 needles that I can use. But was looking for a very thin taper but the HRC needles have a 2.455 taper and I was looking for more along the line of 2.200 or so.

Because I actually didn't say the whole problem. From 5K-10k with the Dynojet needles no matter the position of the clip (although at the top was "slightly" better) it would kick and fart and stutter up to 10k then run it's ass off to redline. I put the stock needles in because of the tip of the needle was a "richer" tip because it was not nearly as flat as the DJ ones. That helped but it is still far out.

I plan on bringing the bike back to the dyno either later this week or the beginning of next week. I have a race on the 25th that is a HP track. I ran this past weekend and got a 1st, a 2nd and a 4th and set the fastest lap time of anyone in the race before my tires went off but the fueling could be alot better. However the dyno here is basically 10 feet below sea level and the race this past weekend was at 600ft above and the coming race is at 1000ft above sea level. So I will have to jet it here on the using the pump gas to set it up for being up there and running the race gas. I've been told as a rule of thumb the jet size should go down 1 jet size per 300 feet. Soooooo I plan on running the pump gas first with the current set up then running the race gas and it should be rich here (my location ) but spot on up there because of the oxygenation of the fuel. But that's only my theory.

One of the other things that I did was Ran 87 octane pump gas for the practice and used my GPS for the MPH. Ran a fastest mph of 103.8 with pump gas and a 104.3 on (87 octane also) VP MR12 race gas which is the best gas our for low comp engines. I figured while at the track by running the race gas it would tell me what the jetting needed. Turns out that it's still too lean as when I added the race gas it didn't run as well throughout the rev range. So I'm thinking 118's or 120's. And am trying to source some thinner needles to fatten up the mid range.

cajun wrote:Ok so you're telling me that NONE of those would work???

Correct.

Have you actually looked at the needle sizes that keihin offer for their range of carbs?

They're nothing like the size of the nc29 needles.

The standard rvf needles (non HRC) will be thinner.

I don't envy your jetting problems when you change altitude, I've never had to contend with that.

Well I guess I was using that link as a example of a place that sells Keihin needles by themselves. Yes the elevation change this sucks for sure but one the carbs are set up the correct way the rest is easy. But that's the problem as of now..... They are Wayyyyyyyyyy far off.. I will have to check my 35 spares and see if I have the stock needles. But I wonder if they would be any thinner than the 29's.

Thanks for the help Cammo. As always of course

No sweat, I have a keihin catalogue with all needle sizes listed, I've looked into this in the past when I was looking into options for my race nc30. Nothing listed was even near a close fit for those carbs, same for nc29/35 carbs.

Before messing around anymore with needles I would recommend trying a bigger pilot jet size, perhaps #38 or #40 (I assume the nc29 runs #35 as standard). Bigger pilots will richen up the whole rev range so just make sure to compensate with the main jet size for this (you may also need to adjust pilot screws to suit at idle, and crank the idle speed up).

This is what I do on my racebike (this was recommended by hrc in the nc30 manual), it helps mask the fuelling transition from the needle to main jets, but you could use it to compensate for a lean needle also, I'm fairly sure it will help solve your issue. You can get the pilot jets from all keihin distributors, they're a standard part.

You could also look at modifying the emulsion tubes, and increasing the float height to make all settings richer, but this is really masking the problem not fixing it, and should be a last resort only.