An ordinary natural aspiration carburetor except YS has tendency to supply less and lean fuel when rising up situation because of gravity. In short, some lean fuel is supplied when rising up the situation more power is required most. From a different point of view of this phenomena, the true potential of the motor is difficult to judge because the condition under too lean fuel supply in up rising phase.
Consequently, YS motor and another ordinary motors equipped with YS fuel pressurizing system is fully pulled out their power and potential utmost. Because, however direction the airplane might going up or down, the amount of fuel supply does not change, no too lean condition. This is one of a most desired performance for stable maneuver drawing in the sky.
This is why I have been insist on YS fuel pressurization and regulator system.
Once YS System is experienced, the user would know how deceive yourself on the main needle valve setting and fixing it like some gambling pseudo angular position?
Up and down, first half and second half, the needle setting point differs and drifts according to the Principle of Natural Science, no matter how muffler pressure might be applied or not.
Of course, in order to invite the system on an ordinary motor, a nipple must be set at the adequate position to take crank case primary pressure and also the pressure activating angular area is precisely regulated. Forming tapping hole might be needed some keen concentration. As we know this is the most important step to do this specialized technique.
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