Ran Yamaha v4 130hp out of oil

[gdpalumbo]

Hey everyone,
So I’ve had my 18’ Jason fish and ski for 15 years with a 1988 Yamaha 130hp V4 on it. It’s always ran fantastic for me. Yesterday I accidentally ran the motor out of oil. I was turning about 4,500 rpms when this happened. I heard the motor start to knock and immediately throttled back to neutral and the motor stalled out. I crank it over once for a second to make sure it wasn’t seized and it turned and still sounded like it has some compression. I feel like such and idiot because I have never had this happen. For some reason I got no alarm. I do have a Yamaha lcd marine meter that shows rpm that apparently goes blank when oil gets low and I saw this happening but didn’t know that’s what the gauge was going blank for....I thought there was a loose connection but now I know for the future. Do you guys think there’s major damage done? I’ll do a compression check later on.
My plan is to drain fuel from carbs, suck up a rich mixture into float bowls and spray into cylinders as well. I really hope I didn’t do damage. I’m fully capable of a full rebuild on this engine but the kit is 800-1,000$. Please let me know what you think. Thanks in advance.

 

[harringtondav]

There will be some damage, the question is how bad. 4500 rpm = 75 strokes/second under load w/o oil. You've nothing to loose by trying to start it and see what happens. I'd spray oil into the carbs while cranking to get some lube in the crank case/con rods. If it starts, good. If it runs without a lot of unusual noise, better.

I'd suspect some cylinder wall scoring and compression drop. Enough to render the motor useless? ....you will find out.

 

[gdpalumbo]

You think rod and crank bearings ok? So if I have decent compression numbers and I don’t hear anything do you think it will be ok? I know it’s hard to say...I would say after it started knocking it was probably 2-3!seconds before I yanked it back to neutral and it shut down.