JN

The number of clip stages for JN jet needles is listed as #1 = 1st stage from the top. The top is the end where you attach the clip. It also includes taper angle and cut-up. The tapered side is on the bottom. The part number is different for large body and small body.

FCR Tuning - Adjusting the Jets Slightly Leaner for Summer...

When discussing carburetor tuning, terms like "rich" and "lean" are often used. These terms can be a bit confusing for beginners.

FCR Tuning - Changing the Straight Diameter of the JN Jet Needle - 2023-05-09...

CBX1000 FCR Setting.Since last month, I have been gradually fine-tuning the settings. The idle and main jet are mostly decided. I’m focusing on the range affected by the straight diameter of the JN (Jet Needle), so this time I will change the straight diameter and take it for a test ride to see how it performs.

FCR Tuning - JN Jet Needle Straight Diameter and Clip Position - 2023-05-03...

Since changing the main jet, I’ve felt a power increase in my CBX1000. I’ve also been interested in trying changes to the slow jet and jet needle. I generally avoid adjusting the SJ (slow jet) when tuning the FCR, unless it’s beyond the adjustment range of the AS (air screw). For this reason, I decided to change the JN (jet needle).

FCR Tuning - 2023-04-12 - Considering the Jet Needle Strategy...

The other day, when I used the CBX1000 to go to a motorcycle event, I spent a long time on the highway. This is a story about checking the FCR's performance in terms of riding dynamics. Although I say I checked it, my overall impression was that the feeling I achieved seemed to be quite rich.

FCR Tuning - For street use, be sure to check the throttle response at the initial opening....

The FCR is a racing carburetor, but in reality, most users spend the majority of their time using it on the street. An important aspect in the street scene is starting. On the street, there are traffic lights, which means frequent stops and starts. On the track, once you start, there is rarely a complete stop.

FCR Tuning - Easily Adjusting for Each Season...

There are various owners when it comes to tuning FCR, ranging from those who want it to be perfect to those who are satisfied with around 80% accuracy. Among them, many owners prefer to adjust the FCR only within the range they can access.

FCR tuning - If you make the jet needle straight diameter lean, it may be pointless to make the jet rich......

This is a description from the history of CBX1000 FCR tuning. It may not be useful, but if you intentionally unbalance the jet, you can use a jet that you can't use. In particular, the CBX1000 tends to run out of clip stages.

FCR Tuning - Jet Search Order from Initial Tuning...

I received an email asking about the FCR of a CBX1000. I'm an amateur, but I try to provide information diligently in my own way. I'm not doing this commercially, but I'm very happy when I get a reaction from the web. This time, I'll write about the order in which you should tune the FCR from the factory.

FCR setting - proper air screw value...

I think the proper way to return the air screw is about 1.5 turns. When I first started playing with the CBX1000 FCR, I changed the slow jet a lot. When I didn't know how to tune it, I just changed everything I could get my hands on. Now I'm trying to avoid changing the SJ as much as possible.

Selecting a jet needle for the CBX1000 FCR model - I want to choose something other than the 90FXM...

The current CBX1000 FCR jet needle shipped by BITO is apparently 90FXM#3. I called to ask. The 90FXM has a special cut-out with an [X]. Normally it's [T]. I don't want to change the taper angle, but I'd like to change the straight diameter in various ways, but there are no options.

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