Though the performance and stability in actual use is already proved by the manufacturer, their regulator system is available or not on another motors by different constructors except Yamada under the natural aspirating carburetor fuel pressurized condition. According to the opinion(probably scientifically proved by actual measurement by the company) The pressure value of the first stage compression in 2 cycle motor crank case is the same no matter how the displacement value might be different, meaning that the first stage pressure value is the same in the smaller motor as 10 cc motor. We might regard it smaller in a smaller motor, but they are the same value, even in L.M. Cox 010 cu inch motor. So, my curiosity to prove the fact if it is possible or not, to apply the system on another motors, it is a simple but long lasting reason why I have been advocating on this point.
The way of experiment
The pressure nipple was set on the front part of crank case for the purpose to pull out the first stage presser that compress the fuel tank to supply pressurized fuel to the carburetor and controlling the fuel amount adequately and supply stable amount according to the motor speed under some changeable burdening condition in the maneuver scenarios. YS regulator is mounted on somewhere nearby the motor independently.
The requirement for operating YS regulator system in steady state
No pressure leak in fuel line and pressure line including one way valve and fuel strainer and regulator such as small grain dust or fiber material from the textile.
Pressure nipple(pressure extracting point and duration) should be properly between 105 degree and 160 degree ATDC. The pressure extraction angle value is very important to obtain the most effective controlling avoiding pressure fluctuation caused by fundamental 2 cycle piston valve construction. The stable pressure supply contributes not only to the tank burdening position, most of the case it is near CG point but also to the linear carburetor action in combination with the diaphragm regulator system. Requirement of the carburetor YS fuel pressure regulator does not have the capability to control the fuel amount at the lowest throttle position. The diaphragm control is not so linearly at the throttle closest position.
Consequently, it should be controlled by carburetor construction by means of fuel squeezing mechanism such as an additional opposing needle or slit closing spray bar designing. Air through controlling screw is not always necessary here. ENYA G-type carburetor is available if the fuel way should be closed utmost following the groove engraved on the throttle valve drum surface.
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