Carburetor adjustment

Bench testing of two motors, OS 25LA and OS 32F with pressure nipples for YS fuel injection system proved the opinion by Mr. Yamada in Aichi Pref. was to the point, as a matter of fact, making the drum type lower throttle hole a bit opened in order to idle mixture richer was scientifically correct. The idling rotation is very stable without any symptoms of motor stop. Let's see what will happen if the motors were actually  installed onto the airplanes.
I know that not a few users had thrown away the YS pressure injection system already because of unstable transition from idle to middle speed. Motor stop phenomena happens if the pressure regulator adjustment should be incomplete. I have often come across with such kind of situations, not a few airplanes were destroyed because of the system malfunction.
As for myself, I have ever been living with YS system as long as 20 years, so I have no hesitation to invite this one to my small airplane if the main needle reaction might be so peaky and troublesome to seek the best angular position.
The key to success and mastering this system is the adequate regulator angular position, there are several ways to know the terminal position to start and to adjust.
Remembering the past, this procedure to fix the regulator angular position resembles that of idle mixture screw in the fully mechanical old WEBER 40 DCOM carburetor for a sporty automobile, Talbot PEUGEOT 205 Rallye homologation model had that twin carburetors, had I been keeping it over ten years. And I would often visited in this 205 Rallye model Land Transportation Office for 2years continued regular inspection held by Authorities.