YS 45 FR motor

Arrived YS 45 FR motor exhibited as a junk material was fully disassembled, cleaned and maintained as usual. Fitting between PC & cylinder has enough tightness as a ABC designed construction like a new one also no scratch on the surfaces was observed on both PC & cylinder. Tightness is not brought by rough handling such as over heating conditioned operation but by the result that had not been used for actual use.
Needle valve nozzle hole for fuel splaying was closed by sludge and vanish that is not a requirement for normal operation. Main driving bearing #6902 was replaced into NTN production with smaller balls but with increasing in number. Establishing all the requirement, miserable old motor YS 45 FR motor has revived as a superb 45 2 cycle motor just like a Phoenix.
Though the production of this model was over 30 years ago, the performance of this YS 45 motor cannot be exceeded by any other ones.