This article contains useful information for beginners of FCR. This is written on the assumption that there are few tools and jets in addition to the settings. The notation is 15 minutes back = 90 degrees back on the clock.
FCR FCR Tuning - Should the Slow Jet Be Changed According to the Season?...
Tuning the FCR requires adjustments based on the weight of air and fuel. As the temperature drops, the density of the air increases, making the air heavier. In response, it is necessary to either increase the weight (amount) of the fuel or reduce the amount of air.
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FCR FCR Tuning - To What Extent Should Carburetor Synchronization Be Done?...
How Far Should Carburetor Synchronization Be Done?When performing synchronization using a vacuum gauge, there are graduations to consider.Is it acceptable for the reading to be off by one graduation?Does even the width of the black line on the gauge count as an error?There are many questions. Recently, I was able to hear the answer from the legend, Mr. Bito.
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FCR For FCR Beginners - Don’t use the red Velocity Stack on the street as it is!...
When you purchase an FCR, it comes with a red Velocity Stack. It’s a 30mm red plastic Velocity Stack. The Velocity Stack of the FCR can be considered the 'exhaust' on the intake side. It is an essential part for smoothing the airflow.
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FCR FCR Tuning - When changing the straight diameter of the jet needle, also adjust the clip position....
When you change the straight diameter of the jet needle, you may need to change the clip position as well, or else the performance can become quite poor. It’s difficult to specify exactly how many steps you should change the straight diameter before adjusting the clip position, but it seems reasonable to think that changing the straight diameter by about five steps would correspond to a change of approximately one clip position.
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FCR FCR Tuning - Changing Slow Jets, Adjusting Air Screw and Pilot Screw - 2023-11-09...
It’s important to make adjustments to the FCR as soon as you notice something off. I’m considering adjusting the throttle low opening screw range and the air-fuel ratio at wide open throttle to be about 1.0 richer. I changed the Slow Jets (SJ) and Main Jets (MJ). This year, I decided not to change the SJ.
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FCR FCR Tuning - If the pilot screw is set to 1.00 turns out, it may not be adjusted sufficiently....
In FCR tuning, the initial values for the screws are typically set to an air screw (AS) of 1.00 and a pilot screw (PS) of 1.00, as stated in the tuning manual. This content suggests that there might be an additional level of power available even after achieving what seems like the best tuning.
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FCR FCR Tuning - Regularly resetting the air screw and pilot screw can improve performance....
The FCR air screw and pilot screw are parts that can be adjusted continuously. In contrast, the slow jet and main jet needle can only be adjusted with specific sizes. The air screw is easily accessible once you remove the filter or velocity stack, making it straightforward to observe changes.
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FCR FCR Tuning - Having an air-fuel ratio gauge is useful for adjusting the pilot screw....
Having an air-fuel ratio gauge (A/F meter) is convenient for FCR tuning. Even without a gauge, you can achieve precise settings through real-world riding once you get accustomed to it. You can adjust mid to high-speed settings based solely on your feel. In fact, it might be better not to get too caught up in the numbers. However, it can be challenging to determine whether the throttle opening at low speeds is functioning well or poorly.
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FCR FCR Tuning - To what extent does the main jet affect the throttle opening range? - 2023-09-19...
I'm describing the effects of changing the main jet, focusing on how it influences throttle positions other than full throttle. After changing the main jet, I went for a test run. My assessment is centered around the changes observed from around half-throttle to three-quarters throttle rather than focusing solely on the full throttle range.
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FCR FCR Tuning - Adjusting Accelerator Pump Discharge Timing and Straight - 2023-09-12...
I’m framing this as fine-tuning rather than tuning in the strictest sense. The tuning of the FCR is the result of repeated A/B testing. It’s a process of searching for jets that improve performance, and then finding even better jets from those improvements.
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