"jet needle"

FCR

The throttle opening and throttle valve opening of the FCR carburetor are not directly proportional....

Even when the throttle is opened to 1/2 on an FCR, the throttle valve on the FCR does not open to 1/2. This is not specifically mentioned in the FCR tuning manual. Knowing this might change your perspective on the operation of the FCR throttle. At 1/2 throttle opening, the throttle valve is typically open only about 1/4.
2023.09.12
       
カテゴリCBX1000FCRManual
タグCBX1000ColumnFCRFCR-Beginners
FCR

FCR Tuning - Testing 6 Variations of Accelerator Pump Diaphragm - 2023-08-22...

One of the highlights of FCR carburetors is the accelerator pump. This time, instead of making just minor adjustments, I performed tuning with all the diaphragms I have on the same day. The accelerator pump diaphragms tested were Standard, KLX250, and KLX400, with discharge timings of 1.0mm and 0.5mm, resulting in a total of 6 different patterns.
2023.08.23
       
カテゴリCBX1000FCR
タグAccelerationPumpCBX1000ColumnFCRFCR-Beginners
FCR

FCR Tuning - Adjusting the air screw to the appropriate setting after changing the slow jet - 2023-08-13...

The position of the air screw has been adjusted to slightly less than 0.30 minutjes return. The pilot jet has been changed from 45 to 48. This air screw setting in summer may not be ideal for winter, as it would likely need to be adjusted (tightened) during colder months.
2023.08.16
       
カテゴリCBX1000FCR
タグASCBX1000ColumnFCRFCR-BeginnersSJ
FCR

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
       
カテゴリCBX1000FCR
タグCBX1000ColumnFCRFCR-BeginnersMJ
CBX1000

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.
2023.07.05
       
カテゴリCBX1000FCR
タグCBX1000FCRJNMJ
FCR

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
       
カテゴリCBX1000FCR
タグCBX1000ColumnCustomFCRFCR-BeginnersMJ
FCR

FCR Tuning - Acceleration Pump Discharge Timing Adjustment - Finalized as is - 2023-06-20...

FCR Tuning for CBX1000. I was concerned about the discharge start position of the acceleration pump, so I conducted a test ride. As a result, I ended up making changes and then reverting to the original settings. There wasn’t much noticeable difference.
2023.06.21
       
カテゴリCBX1000FCR
タグCBX1000FCRFCR-Beginners
FCR

FCR Tuning - Test Ride with Awareness of Shift Position - 2023-06-17...

I'm still not quite able to tune it perfectly yet. Recently, I had the opportunity to ride on the highway. During the ride, I noticed something: I realized that I haven't been tuning with much attention to the shift position.
2023.06.20
       
カテゴリCBX1000FCR
タグCBX1000FCR
FCR

FCR Tuning - Adjusting throttle openings below 1/4 with the air screw, slow jet, and jet needle straight diameter - 2023-06-11...

This time, I will write about the air screw, slow jet, and the straight diameter of the jet needle from my perspective. This primarily concerns the throttle openings from about 1/4 to 1/2. Recently, I addressed and improved the issue where the throttle would hesitate during rapid opening—whether it was lean or rich was unclear. I will document the improvements made.
2023.06.12
       
カテゴリCBX1000FCR
タグCBX1000FCRFCR-Beginners
FCR

FCR Tuning - Jet Needle Clip Position and Accelerator Pump Diaphragm Replacement - 2023-06-10...

I was concerned about the throttle opening being less than 1/4, so I made some adjustments. Here’s what I did:①Changed the clip position on the jet needle.②Set the acceleration pump diaphragm to the standard output.I will discuss both points. There is an important note: do not perform these adjustments simultaneously.
2023.06.12
       
カテゴリCBX1000FCR
タグCBX1000FCRFCR-Beginners
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