FCR-Beginners

FCR tunings - all changes - 2022-07-09...

The theory of FCR turning is AB testing,one step forward,two steps back! After about a month of trying various things,I decided to completely change the turning. Rather than ignoring the theory,this is the first step in tuning it up. I've tried a lot of things and have a good history,so I changed everything in one go and started over.

2022.07.10

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Test run - Throttle opening 1/2 - MJ change - 2022-07-08...

This is about the CBX1000 FCR turning. I wrote about the results after replacing the MJ in my previous post,but I'll write about my impressions after a test run. I value test runs,but if you have an air-fuel ratio meter installed,you may get caught up in the numbers,so I try to be careful.

2022.07.09

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FCR - tuning - MJ and JN influence - 2022-07-08...

In the previous blogs,I was a little worried because when I started suddenly,there was a bump at about 1/2 throttle opening. The cause was the combination of the MJ main jet and JN slow jet. The reason for the judgment was that if the MJ was extremely lowered,it would not go away,but there would be a change.

2022.07.08

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FCR tuning - Acceleration pump adjustment - 2022-07-06...

Since I had time to touch the motorcycle,I adjusted the FCR's Acceleration pump diaphragm. Even though it is an adjustment,it is just a matter of replacing the diaphragm. FCR's acceleration pump is an obscure and incomplete device. It is an unusual device that cannot be called precision like jets.

2022.07.07

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Is a quick turn throttle necessary for FCR?...

This is a story that always comes up when converting an old motorcycle into a racing carburetor. Since racing carburetors are intended for full-throttle driving on circuits,it is best to install a quick turn throttle. Depending on the purpose of use,there may be exceptional reasons not to install quick turn throttle,although it varies case by case.

2022.07.05

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FCR tuning - Lean slow jet - Changed from 48 to 40 - 2022-07-03...

This article is just about replacing FCR's SJ slow jet. Due to rain in the forecast,I decided not to do a test run and just replaced the SJ. SJ-48→SJ-40Actually,42 is probably better since it is the default value,but I want to verify the difference myself,so I replaced it with SJ,which is the lowest value than 42.

2022.07.04

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FCR-tuning - With Boko - 2022-07-02...

While cruising,when I suddenly open the throttle from 1/8 to 1/4 or 1/2,I have a problem where it hits me,or the air-fuel ratio drops to 10.1. I couldn't adjust the PS pilot screw while the engine was running,so I tried various things.

2022.07.04

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FCR tuning - AS Adjustment - 2022-06-25...

CBX1000 FCR turning. I adjusted the AS air screw and the PS pilot screw. As I wrote in another article,my current opinion is that there are no surprising changes in PS and AS for each cylinder in the CBX1000.

2022.06.27

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FCR tuning - MJ main jet change - 2022-06-23...

Recently,the situation has become such that instead of tuning up FCR when I have time,I make time to set up FCR. I have to either calm down a little or get over it to the point where it doesn't bother me. Although it is called a main jet change,MJ and JN were changed.

2022.06.24

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FCR tuning - MJ or JN - 2022-06-20...

I couldn't help but worry about it,so I decided to leave work early in the morning and finish by noon to set up. I have no complaints about the turning,but what would happen if I changed them? I want to know. This time,MJ was changed and JN was changed accordingly.

2022.06.21

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