I will write various things about the Velocity Stack of city riding-FCR. Talk about vertical orientation and processing, etc.

I am writing from the perspective of a city rider.
Racing-oriented motorcycles are also commonly specced without filters.
It's just as the title says. FCR Velocity Stacks have a direction. please note.
If you end it with one line, it will end up being like, ``I should post it on Twitter.''
There are many riders who like FCR who modify the FCR Velocity Stack a little.
I won't write about Velocity Stacks in detail, but
I will write to the best of my knowledge.
This is a useful blog post for those who have just made their FCR debut.

There are mainly two types of processing.

Processing the FCR Velocity Stack is not a fashionable process, but may be necessary in order to install it in a manner suitable for the vehicle. It can be operated without any processing, but it is better to do at least some processing.
In the first place, Velocity Stacks are installed to control air flow, so cutting or drilling holes is not recommended. Depending on how it is processed, it will be more like a city ride than the ultimate racing idea. This process is generally done for convenience.
① How to make a hole in the Velocity Stack to make it easier to touch the air screw. Or how to cut the bottom part.
② How to cut the side to install the Foam Air Filter Sock.
There are roughly two types of processing that are applied to the FCR Velocity Stack.
FCR Velocity Stacks have lengths.
In many cases, shorter Velocity Stacks require processing.
I will briefly explain ① and ②.
First, let's talk about ①.
If you want to access the AS air screw with the Velocity Stack attached, you can cut the bottom of the Velocity Stack or
Processing such as drilling a hole at the bottom of the Velocity Stack is required.
If you are using the early 25mm red Velocity Stack, it will be difficult to turn the AS with the Velocity Stack attached. If it is a long Velocity Stack, it will be difficult to turn, but it is not impossible to turn it.

Next, let's talk about ②.
I have carried out this processing. It depends on the vehicle, but it is an essential process for my CBX1000. With the default FCR Velocity Stack, the left and right pitch (gap) is too narrow to allow Foam Air Filter Sock to cover the Velocity Stack. I cut only the right part of all six FCR pieces to widen the gap so I can install the Foam Air Filter Sock.
This is a process that becomes necessary when the above two points are required.

Installation of aluminum Velocity Stacks on CBX1000 is something to consider.

CBX1000 requires consideration when installing aluminum Velocity Stacks.
Aluminum Velocity Stacks cost around 5,000 yen each. CBX1000 requires 6 pieces, so it will cost around 30,000 yen. Since it is a stylish item, you want to avoid cutting or drilling holes, so you need to consider whether it is absolutely necessary for your CBX1000. Since it is a fashionable item, avoid sharpening it too much.

Velocity Stack length – gain flow velocity

FCR Velocity Stacks have various lengths even with optional parts.
In general, short Velocity Stacks are suitable for high-speed driving. A longer Velocity Stack increases low speed torque...
I don't know if it's true or not. When the engine sucks in the air-fuel mixture, the longer the Velocity Stack, the faster the air-fuel mixture is sucked in. I can understand it if you say it logically, but if you ask me if there is any difference depending on the presence or absence of a Velocity Stack and its length, I have doubts.
I am installing a 50mm Velocity Stack.
At least if you know the above logic, you don't want to have no Velocity Stack.
The Performance air filter specifications are not much different from those without a Velocity Stack, so it is difficult to say whether there is a Velocity Stack or not.
The motorcycle will run faster if you attach a Velocity Stack.
Another reason is that it is installed to install Foam Air Filter Sock.

The effect of fine wire mesh

Fine-mesh wire mesh has the effect of preventing backfire.
It doesn't seem like it's originally intended to prevent dust, but it also repels large particles.
Sometimes it is made by hand.
That's wonderful.
This will be disadvantageous in terms of gaining flow velocity.
It is necessary to consider whether to implement it.
There are also budget considerations.

Velocity Stack installation on CBX1000 FCR

My CBX1000's FCR Velocity Stack has the right side cut.
The reason is to make it easier to install Foam Air Filter Sock. Since it is a 50mm Velocity Stack, you can turn the air screw without any problems using a short flat head screwdriver. The reason all 6 are cut only on the right side is to make it easier to see the up and down orientation, and because any of the 6 can be installed anywhere from 1 to 6 on the carburetor. If it's true, the correct answer would be to use a dedicated cutting method for each cylinder,
I felt that the work efficiency would be poor, so I installed all 6 pieces by cutting only the right side as shown above.

No filter with red Velocity Stack for FCR beginners

I really hate riding on the street without a filter with the red Velocity Stack that came with the FCR when I bought it. The reason is that it looks like it was added without any thought.
It is good if you are installing a red Velocity Stack to install a Foam Air Filter Sock.
If you go through the trouble of installing the FCR yourself, you will feel that it is a good idea to attach the filter.
I believe that a motorcycle being ridden on the street with a red Velocity Stack FCR without a filter will accumulate a small amount of damage to the engine.

I will write various things about the Velocity Stack of city riding-FCR. Talk about vertical orientation and processing, etc.【summary】

FCR has the largest market share in the racing carburetor industry, so there are plenty of aftermarket parts available.
Especially regarding Velocity Stacks, there are many interesting products being sold by various manufacturers and individuals.
Yoshimura-sama is sold,
Ultra-long Velocity Stacks called dual stack Velocity Stacks and bazooka Velocity Stacks, Velocity Stack extension kits, Velocity Stacks with spiral lines inside the Velocity Stack, various aluminum Velocity Stacks, etc.
Roughly written, this is the situation. There are many other creative products as well.
Although I have mainly written about Velocity Stacks, there may be some people who are worried about Velocity Stacks and can't sleep at night.
Up to the above, you should have been able to write about the air intake port of the FCR throttle valve.
I'm sure you all spend your days worrying about Velocity Stacks.
Please take care to avoid accidents when taking a test run at FCR.
See you again!