Yamaha 225 OX66 Survey Ideas?

Jamato14

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Aug 24, 2020
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NH
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Jim
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23’ Palmetto Custom CC
Surveying a boat tomorrow with twin yamaha OX66 225’s with 560ish hours per owner (2000 vintage). Surveyor is doing compression check and checking LU oil. Sea trial to check RPMs under load. Based on everything I can find there isn’t much more I can look at to assess the engines besides obvious visual signs of misuse which from my first inspection was clean and both started right away cold in a tub in sellers driveway. Any idea if there’s a way to check cross hatching to see if they’ve been rebuilt? I’ve been hearing conflicting info on this. Anything else to check besides compression/LU/running under load? My last engine was a 4 stroke so the computer told a lot but that’s not an option on this. Any insight on what to check besides the known or basic things appreciated
 

archsea bunker

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IMO one of the best motors Yamaha made, compression check should be close on all cylinders hot and cold . Lower unit as noted, I would pull the thermostat to check for salt build up but then you need the gasket to put it back. If you move forward get yourself a manual very easy motor to work on, any issues are usually fuel related , Thats very low hours for those motors, low pressur fuel pumps and the vst filter are the usual culprits for poor running, Good luck
 

Boxerboy2

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Easy motor, you will get real familiar with your VST filter/tank but its no big deal. No engine hours on the electronics so you will need faith in the original owner on total hours.
 

Jamato14

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Aug 24, 2020
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Location
NH
First Name
Jim
Boat Make
23’ Palmetto Custom CC
Thanks guys, surveyed perfect yesterday, got up to RPM in range and 11/12 cylinders were at 115 compression with one at 120. Clean LU oil and no issues during sea trial. Engines seem to be in great shape just like the rest of the boat. Owner has a shop manual for them that’ll be mine at closing so I’ll make sure to get to know that well
 
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