Mischievous YS 45 FR

Fuel overflowing from YS 45 FR carburetor throat unexpectedly happened yesterday, some pressure leak on any pressure connection in the regulator construction, it's rubber valve crack, the stem clogged-sliding action, lack of sealing at some peripheral part of diaphragm valve, lack of physical property of tiny O shape rubber ring equipped on the main needle valve body, the main one way pressure valve, a fuel filter dusty inclusion.
Very careful inspection seeking small dust or a tiny tip of fiber must be done, however boring task it may be, what should be done must be done any way.
In case no reason of this inconvenience were found out, all the power source and connections including a fuel tank at CG portion should be replaced into different new ones.
Repeated flight training of maneuvers cannot be continued if the setting all the mechanical condition of the airplane itself is not established well.
A piece of anxiety should not exist in my mind and all of them should be eliminated thoroughly before the flight.
This concept for safety is exactly the same as that of an actual airplane.

This tube arrangement shows some very specific only for YS fuel pressurized system, this is the initial choke syringe connective port to cause initial combustion. Once started, additional choking is seldom required YS motors. In case of cylinder down burdening of YS motor, it is difficult to give priming without the airplane set in up side down.
The priming fuel from the tube comes into the intake port through the pressure line, then it would pilling down to the combustion room automatically. No more external fuel supply is required also no electric starter action also. Single finger flipping would start the combustion without any anxiety.
This is the remarkable way to start motor without holding up side down, the flyer can do without any helper or airplane holder. Mechanical starter motor pushing on the spinner giving considerable stress on the crank shaft backward to axial direction.
Special way how to start up side down burdened YS motor appeared in the article published on Radio Control Technique (Japanese Edition 30 years ago) in detail.
If you come across with the article, you will find out how to do that.