Re: F50/TTGoes Up But Won't Stay
could be a lot of things, most all will require a unit tear down and inspection.
could be the manual release valve could be the tilt piston orings.
most shops are scared to open that single piston unit up.
ask to see the sticker certifying them for yamaha drive train.
it will be a gold sticker on the school diploma showing which technicians have recieved factory training from yamaha, no sticker no training.