I have a FA-100T which was donated to me recently. The engine is about 18 months old but does not appear to have the same levels of compression as my Saito 56, 180 and 220.
The bores look pristine and the valves are not leaking. I do not know if the engine has been laid up but from its external appearance it does not seem to have been used much.

Can any member throw light on this issue, which would be appreciated