I am the owner of a Honda motorcycle [CBX1000] who lives in Hiroshima City, Japan. I am posting about FCR carburetor and CBX1000 customization. I also post about things other than cars and motorcycles. We will post information that will make bikers around the world happy.
Can you do something like this? This is a story that made me want to get angry. I adjusted the fuel level the other day.
Adjusting the fuel level means adjusting the fuel level of all 6 cylinders to the same height.
If you just make sure the fuel surfaces are at the same height, it's easy.
Anyone can do it, so
Please do your best. end!
It wasn't.
Anyone can do it just by aligning the height of the fuel surface.
The standards are difficult to understand.
I was unable to determine the height of the fuel level.
I tried my best to read the manual, but
Even when I turned the FCR upside down and looked at it, I couldn't really understand the standard height of 9mm.
Also, I don't know if the angle of tilting the FCR of about 15 degrees is really correct.
Is the downdraft FCR about 15 degrees?
Is it about 15 degrees for all FCRs?
Is the horizontal about 30 degrees?
Is it a good idea to set the tension on the float valve spring to the level shown in the manual drawing?
It was very difficult to understand.
My conclusion is that the tension of the float valve spring is
I worked with the understanding that it would be best to tilt the horizontal caburetor approximately 30 degrees.
I don't know if it's right.
And the fuel surface, which I thought I had matched exactly last time, was probably 14mm.
The fuel level was low as it exceeded the manual specification value of 9mm+-2mm.
Still, the FCR that moves is scary. When I tried to write it down again, it was pathetic.
I was so pathetic that I didn't notice that the vacuum gauge was out of alignment.
In theory, if the fuel level is too low, it is a big problem such as running out of fuel.
At higher fuel levels, the risk of overflow increases.
FCR manual
The drawing shows a downdraft caburetor, so I was wondering what the horizontal angle would be.
It looks like this on the drawing, but when I measured it, it looked like 30 degrees, so I decided to move forward with a 30 degree angle.
FCR-Fuel Level Adjustment-tuning Manual
FCR-Fuel Level Adjustment-tuning Manual
FCR-Fuel Level Adjustment-tuning Manual
Secret Weapon – Float Level Gauge
I used to use a caliper or a caliper to adjust the level, but the float level gauge is the most reliable.
This is one of the most impressive tools I've purchased recently.
I don't like the right angles, surfaces, and scales of reliable gauges that look sloppy.
At least it is possible to arrange all 6 cylinders at any desired height.
If you don't have this, you can use calipers or other rulers to match the heights of all six cylinders.
It is difficult to match it to the specified height.
FCR-Float level gauge
FCR-Fuel Level Adjustment-Float Level Gauge
FCR carburetor angle
Currently, I can only measure it in this rough way,
I measured it to the best of my ability.
I measured the angle of the image using an iPhone app.
FCR-Fuel Level Adjustment
FCR-Fuel Level Adjustment
I took a quick look at it from the side using an app that can measure angles. It depends on where and from what angle you look at it, so there may be no point in finding the exact angle, but I think it's the approximate tension of the float valve spring.
Float movement on YouTube
To be honest, I'm wondering how to make something like this match the standard height of 9mm.
At present, I am not sure whether it is an item where there is no problem even if the accuracy is low.
How the FCR float moves
FCR-Fuel Level Adjustment【summary】
From now on, I will keep the fuel level in mind every time I remove the float chamber.
There are standard numbers for fuel.
I would like to investigate how the fuel level changes when it goes higher or lower than the fuel level.
If the strength of the spring is constant, you don't have to specify an angle of about 15 degrees, just measure the height of the float horizontally or vertically based on the vertical surface of the FCR body.
I interpret this to mean that the angle at which the spring tension is released the most is approximately 15 degrees for a downdraft carb.
Since it's my own carburetor, it doesn't matter if it fails.
Next time I touch SJ etc., I will think about various things again and try adjusting the fuel level.
What I learned from this setup is that if you measure it with a caliper and match the float, it will deviate from the standard fuel level. Some websites claim that the adjustment can be made without a float level gauge.
When I actually measured it, the fuel level was surprisingly low. As you understand the structure and mechanism of FCR, the number of things you want to try will increase.
Next time I'll raise the fuel level a little higher and will the intake noise at idle change? Check the before and after carefully.
See you again!
