Yamaha Trim Repair F90 F100 F115XB 50 2 Stroke and 60 2 Stroke 

All good man, thanks very much for watching us!

De nada, espero que todo se fue bien con el arreglamiento

Email me at tyler@outboardst.com or call me tomorrow at 843-607-1973 I have a couple questions and should be able to help a bit

Sadly they do not. All seals, o-rings etc have to be pulled individually. That said, there are some Yamaha dealer parts desks that will know what to pull immediately just by giving them a model number. I will post a complete parts list with OEM part numbers asap.

That would be excellent. Cheers@@outboardst.comoutboardspec8631

The only Evinrude PTT's that I've worked on are 3 cylinder (2 trim, 1 tilt) found on the V4 and V6 models on older 2 strokes and also found on mid range hp Etec. The 3 cyl units are literally identical to the millimeter to the Showa units used by Yamaha, Suzuki and Honda. I've used Yamaha seals on Evinrude ptt before. So, if you're working on the 3 cylinder Evinrude ptt, yes, I've worked on them forever. Unfortunately I have zero experience on the other models

If there is no evidence of external leak/bad seals etc, it's high proabability that the internal seals on the inner cylinder are failing. First thing I'd do is verify that the unit has adequate fluid levels, and check that the manual release screw is seated/in all the way. If unit continues to leak down and there is no sign of external damage to the seals, then really the only choice is to have a look at the inside. I have repaired many units with zero evidence of external leakage that ended up having bad seals on the inner cylinder. There is a chance that debris can be lodged in one of the check valves in the unit, causing leakdown, but this is much less common than finding damaged seals, especially if you find that the fluid is super clean when you open the unit up.

Thank you for the extremely comprehensive answer! @@outboardst.comoutboardspec8631

The trim motor is usually not the cause for this type of problem. You will likely need to take the unit apart, clean out the old fluid, clean the internal parts and replace seals and o-rings. What you are describing is common for a unit the has lost some fluid, or has some debris hanging out where it shouldn't and causing the unit to not be able to build pressure and hold pressure reliably.

@@outboardst.comoutboardspec8631 thanks for the reply 👍