With the quick turn throttle housing, you can set the throttle free play to 0mm!

With the quick turn throttle housing, you can set the throttle free play to 0mm!

When you install a quick turn throttle, you'll have access to the throttle stop screw function, which is not present in a standard throttle housing. Despite its somewhat grandiose name, it's simply a screw hole that allows you to adjust the minimum return position of the throttle.

Without using the bolt, if the throttle return is at 0%, the bolt allows you to set the throttle to be open by 1%. You can reduce the throttle play, which is often cited as 5mm, down to as little as 1mm. However, it is important to note that setting the throttle free play to 0mm is dangerous and should not be done.

The proper procedure is to adjust the throttle play using the throttle cable first. After making the necessary adjustments with the cable, you can use the throttle stop screw for final fine-tuning to determine how much the throttle opens by default.

There is no problem if you choose not to use the throttle stop screw that comes with the quick turn throttle. It allows you to adjust the throttle to be slightly open if desired. I had not used this function before, but I recently started using it because I felt limited in reducing the play to the extreme with only throttle cable adjustments. As a result, the idle stop screw on the FCR side will become non-functional.

Initially, make a rough adjustment with the idle stop screw, and then use the throttle stop screw on the throttle holder for the final adjustment.

I’ve covered most of what I wanted to write above, so the following will include additional notes or personal opinions.

Let’s get started!

Throttle stop screw, a feature specific to quick turn throttles

When you purchase a quick turn throttle, you'll gain access to the throttle stop screw feature, so be sure to try it at least once. There might be cases where it is not usable, but having it as an option poses no problem. While it is currently not essential for me, I am testing it because it's a feature that is available. The bolt diameter is M5, and a lock nut will also be required.

adjustment method

①Open the throttle about 1/4.
②Tighten the bolt slightly.
③Check the throttle return position.
④Repeat steps 2 and 3 until satisfied.

Note: Do not tighten the bolt while the throttle is fully closed. The bolt may dig into the inner tube of the throttle and prevent movement. For fine adjustments, the range of movement for the bolt is smaller than you might expect.

Adjusting the throttle cable is essential for FCR carburetors.

For users of racing carburetors, adjusting the throttle cable is essential. This is because the operation of the FCR valves is directly linked to the throttle cable. Even if you're not using a racing carburetor, be sure to pay attention to throttle cable adjustment. The direct feel of operation is one of the joys of using racing carburetors. By carefully adjusting the throttle cable to your preference, operating the FCR can become extremely enjoyable. Adjusting the throttle is something you can do yourself without risking damage to the motorcycle. Even if performance issues arise, they can be easily resolved.

FCR Beginners – Idle Adjustment

This is not specifically for beginners. It is useful for adjusting idle speed and other related topics. It is not necessary to use the throttle stop screw for idle adjustment; adjustments can also be made on the carburetor side. The optimal idle speed for an FCR is 1300 RPM. Using the throttle stop screw mentioned in the title might make adjustments easier. It's important not only to set the idle speed to 1300 RPM but also to check that the voltage is not dropping too low. My CBX1000 tends to have lower voltage at lower RPMs. I adjust the idle speed to a point where the voltage doesn't drop excessively. The RPM meter is an analog type, which makes it difficult to measure accurately. Setting the idle speed to a position where the voltage is sufficiently high is also acceptable.

With the quick turn throttle housing, you can set the throttle free play to 0mm!【summary】

Most quick turn throttles you see on auctions or Amazon come with a throttle stop screw. When you install a quick turn throttle, you will likely wonder what this screw hole is for. I use the ACTIVE TYPE3 on my CBX1000. The inner tube is 44mm, which feels a bit large. However, I think a size around 40mm would be more suitable for an FCR. Although it’s a bit of a tangent, the throttle stop screw is a function that can be used or not used, depending on your preference. However, I recommend trying it at least once.

Wishing you all a wonderful motorcycle life! See you again!

CBX1000 – Photo Gallery

These are photos from past posts of the meter area and throttle cables.