YS 45 FR complains!

Though I have been making little of YS 45 FR motor to conquer and to be put under fully control without some specific effort for me, because had I been gotten accustomed to use YS 60 FR motor everyday flight about 30 years ago. But the reality to use 45 motor is completely different from the imagined situation. 30 years of absence from the Radio Control Model Airplane field made me forget every keen sense to make full use of YS fuel pressurized system and to apply a special skill on Tune Pipe setting procedure.
The difficulty to do do that is conquering the variable factors which interacts with each other, main needle setting combination with the regulator angular adjustment, Tuned Pipe setting position adjustment with main needle valve, an adequate road propeller selection while high up and in descent posture with Tuned Pipe position and  some smooth followability of throttle controlling while maneuver actions, in addition the exhaust sound should be discerned with comfort by the audience.
Following the premium advice suggestion by the representative of YS motor company that the most suitable Tuned Pipe setting position does not exist as some range with some width but does as "A single pointed position". He put an emphasis on that point at that time about 40 years ago.
Consequently, seeking the point is not an easy task, but an ultimate and unexplainable pleasant would be tasted when after being established it and proved the result in the competition, tens years ago, a famous world champ came to me to praise me as the best exhaust sound contestant. Best balanced motor operation sound differs from others those are not so.
The excellence of the internal combustion engine is exhausted to it!