Welcome to the Saito dead stick zone.
I have had the same problem with all of my Saito's. I have loved the way run. They have been my best friend and then,,,,,,,
Oh no,,, why,,, why now,,,,,,, of all the times they have run without the slightest adjustment,,,,, and now,,,,,,,,,,,,,,,,,,,,,,,,,,
Crunch...
Saito man no more. Maybe it's me but I have a bad taste and will go with YS from now on