Super Tigre 71 & OS 40 PS 15320

Some Yahoo Auction conscientious seller provided me of an ancient Super Tigre 71 motor at reasonable price the other day. It has no inconvenience such as clogging, lasting in bearings also in a piston ring portion and lance chest nut marks by a layman. It has been kept in good circumstance by enthusiastic mania with love. A taller plug terminal reminds me of many good memories in my younger period of life. The scavenge system is not a sophisticated one like Shinyure design, but conventional self scavenging one  with reflection plate on the piston top surface.
This motor would be set on a F3A stunt model, "Stock" designed by Mr. Yoshio Akizuki 35 years ago who was my most intimate friend in the field. He is also an  advanced researcher in GFRP propeller, actually he provided his products.
Though I have never met for long time, our friendship would be immediately remember again. He must be a good adviser if I might go into F3D world.

By the way, I also got an another motor, OS 40 PS that was specially produced only for F3D competition, 40 Pylon Racing, tens years ago, the factory designer had been already resigned because of age regulation in the company.
It was exhibited as NIB condition and at cheaper price with some reason. As it was provided as a established kit, including Tuned pipe, metal graved one piece beam mount and a machined spinner.  So, without important other goods was the reason for cheaper price. No anxiety exists, because my junk box has a Tuned pipe for F3D.
Finding out some extaordinary tight piston and cylinder fitting at TDC, Mr. Haneda replied in telephone, it's a normal factory setting condition, turning drive plate by finger power is impossible like a car racing ABC motors. Higher combustion temperature at higher rotation might cause more thermal expansion at TDC portion? This is why the tighter P/C fitting design for OS 40 PS 15320 is invited that rotate over 20,000 RPM?