1990 Force L drive 85hp 90 psi on compression

[TnTommy]

I have a 1990 Force L drive 2 stroke 85 hp that is showing 90 to 92 psi of compression on all three cylinders so pretty consistent, this motor has sat around for at least 15 years without being ran, I'm trying to sell it and the guy wanted to see it run so I've got it running and it sounds pretty good,but he says this is pretty low compression is that too low, I am using a harbor freight gauge as well told that might make a difference.

 

[Mc Tool]

If it is 90ish Id say to low , these things should have 125 for a good used motor and 150 new .
It might have go a bit rusty in there ,rings may have stuck to the pistons or it might have been a bit tired when put away 25 years ago .
Have a look at the bores for rust but my money is on it being worn out because all cylinders are all about the same psi.