OS FS20 in good condition

Very rare and seldom vintage model 4 cycle motor was obtained from Yahoo Auction at some reasonable price the other day, OS FS20 is one of the smallest one in the world. The seller dictated some disadvantage instead of relatively low price, lack of compression like nothing and dirty a bit, but I had some self confidence to repair it and survive as an actually useful motor for participating in the meeting of Golden Age & Old Timer held twice a year at Kyoto Uji.
Fully overhaul was done on it, disassembling and cleaning a parts for removing sludge piled between a piston grove and piston ring, valve guide and valve, cam shaft supporting construction, also replacing crank shaft supporting main bearing #6901.
Thanks to my desperate effort on this tiny motor, a miserable FS20 has been survived like a phoenix, strong compression that is indispensable for normal operation was regained.
This motor would be observed by some enthusiastic old modelers with big surprises burdening on the model airplane "Super Tiger 102" that had been designed in single channel period by Jumpei Kato who had been an elder brother of Masahiro Kato, famous for his champion ship at the very beginning of model airplane age about half a century ago.