YS 60 FS Ringed

YS 60 FS for Helicopter was obtained from Yahoo Auction at 1,190 yen the other day. My intention is to have carburetor part for the same type motor at my hand.
In spite of a lack of needle valve, the condition was good without any damage.
Ringed piston is keeping good compression and no too much used symptom was observed, probably used very little.
The drive washer thickness is reduced about 5 mm shorter, so a propeller for airplane is acceptable without any modification, the key length is cut a half. This kind of modification is the first time that I come across for YS 60 FS model.
Judging from the drive washer finish, this machining must have been processed in the factory.
Crank shaft supporting bearings, #6903 and R6Z were replaced as usual, carburetor fuel line was cleaned and diaphragm function was checked.
This lovely YS 60 side exhaust model will be burdened on an old model airplane that I modified "Head Master 60" in very near future.
As for a normal muffler for this motor would be invited that of ENYA 60 X, with a slight adjustment on the pitch for fixation.