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FCR Tuning - Re-synchronization after adjusting the throttle cable - 2023-08-01...

I synchronize the FCR carburetors on my CBX1000 more than 10 times a year. Whether 10 times is a lot or not, I’m not sure. It’s not that I feel the synchronization has drifted while riding and then correct it. Rather, it’s because minor misalignments occur when I perform tuning and have to remove and reattach parts.

2023-08-05

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FCR Tuning - Tuning the main jet at full throttle is fun....

As you gradually open the throttle from a low position, you will adjust the relevant jets and screws. Once the low-throttle setting is in good condition, the main jet (MJ) is often already in a good or near-good state as well

2023-08-02

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Spark Plug Replacement - The Idling of Carbureted Engines Smells Like Gasoline...

If you feel that the idling is off, replacing the spark plugs and then re-tuning is a viable option. Tuning involves various interconnected factors, and the spark plugs might be one of the causes of irregular idling. By replacing the spark plugs, you eliminate one potential concern.

2023-07-26

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FCR Tuning - Full Throttle! How lean can the main jet go? Will the engine hold up?...

I have performed full-throttle runs with a main jet size of 102 on my CBX1000.This is a discussion about how lean the main jet can be set based on past experiences.I should clarify that I haven’t tested it to the point of damaging the engine, and the testing is therefore insufficient. The inadequacy of the testing is due to the fact that it has not been tested until the piston melts.

2023-07-04

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3 Reasons Why Used FCR Carburetors Can Be Used...

When you perform the overhaul yourself, it generally ends up being quite cost-effective. This is specifically if you handle the overhaul personally. If you don’t have jets and other parts on hand, it's recommended to use the Carburetor Parts Kit for FCR - KEYSTAR. If you already have some FCR parts, you can buy individual parts separately and complete the overhaul that way.

2023-06-29

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FCR requires a filter for street use. Constant use of a velocity stack is not recommended....

This applies not only to FCRs but to all carburetors in general: going filterless on the street is not recommended. This is because it sucks in debris. I will write a column discussing why it’s better to avoid this and what you should do instead.

2023-06-23

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Carburetor synchronization is not the kind of maintenance where you can fail – the challenging part is the preparation....

Carburetor synchronization is a task that can be considered simple. The challenging part is that the preparation before the task can be a high hurdle for beginners. Once the preparation is complete, most people are able to successfully perform the synchronization on their own.

2023-06-16

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FCR Tuning - Adjusting Accelerator Pump Timing and Air Screw - 2023-06-05...

Recently, I was concerned about the throttle opening being less than 1/4, so I made various adjustments. It seemed that the AS (air screw) wasn’t opened enough, so I opened it slightly more, and it felt significantly better. I also experimented with the accelerator pump by turning it off, setting it to 0.6mm, and then to 1.0mm, and adjusted the discharge timing accordingly.

2023-06-06

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Which is better, the Keihin FCR carburetor or the CRS carburetor? Of course, the FCR carburetor....

I’m writing a column comparing which is superior between the FCR and CRS carburetors. It’s not just a broad statement that the FCR is better because it’s a newer model. Instead, I’ve heard compelling explanations from professionals that should make you understand why.

2023-06-02

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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).

2023-05-06

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