I thought I had a leaky trim cylinder on my Yamaha F40 too. It turns out I had to tighten the manual trim screw. Its the screw that loosens the trim for manual trim. Mine was not tight and the trim would leak at higher speeds. I attached a picture of where that adjustment is on my 2002 F40.
Hannay’s in Minneapolis is a Yamaha dealer and I thought their prices were fair the last time I went there. I even think they have Winter rates too.
I’m pretty sure mine’s the cylinder or something. I’ve replaced the fluid, bled the system, etc. When under load and running, I can trim the motor up but not down (it just whines). If I throttle down, it will trim down.
We usually have someone coming or going between stores Pete. Happy to give you an estimate once we see it. Feel free to give a shout.
Huh I didn’t think you guys did that stuff, figured you sent it out – I’ll shoot ya an email, Dean. Thanks