1986 200 HP Black Max Vro still there - compression thoughts

[Jmhout]

First post go easy.
Well I am happy to say I got my first Ranger it's a 393v with tandem brakes and a Mercury 200 black Max.
Boat has been driven on canal and no wake areas for 5 years. The engine starts and runs well. No idle issues and seems to run at moderate speed just fine. Have not pushed it at all as we plan to do much maintenance...
New impeller has arrived and new fluids etc are for sure going in.
The major issue is we compression tested it and cylinder 2-6 are at 90. Cylinder 1 shows 60.
Before everyone jumps down the rebuild it now path I get those thoughts.
What I am wondering is should I decarbon first to see if it helps?
Key questions
1. Has anyone actually had an engine return to okay pressure?
2. Can I run it easy and get some use out of it as is?

Engine serial number is 0A980593.
I believe it is a
0A168044 THRU 0B290009 - MERC MAR 2.4L (EFI)
If yes should this post be in a different forum?
Moving to correct engine size forum. Moderater can you delete this as I moved it to the correct size engine forum.
Thanks

[acesover]

Might want to try the 3 liter forum listed below.

[Jmhout]

Thanks... After your suggestion I researched a bit more and it appears it is a 2.4? Will research to see the correct forum a bit more

[acesover]

Hope you get some answers!

[EuropeanAM]

2.0/2.4/2.5 models are in the next forum down.