90 hp with low compression on #3 & 4 cyl

[daninbuffalo]

I am considering purchasing what looks like a very clean 1989 19' Starcraft at a very low price. However, I am told that the compression on the cylinders is: 120lb on #1, 115lb on #2, 70lb on #3 and 95lb on cylinder #4. How bad is this and is it common? I know it is impossible to diagnose a problem with this limited information but I guess I am wondering if there is a common cause for this condition?

I am new to power boating but my kids love getting out on the water tubing and fishing so any info would be helpful.

Thanks!

[boats.net]

That motor will need to be rebuilt. The compression is not with-in specs.

[daninbuffalo]

Is a rebuild a $1000, $2000 or more proposition?

[boats.net]

The cost depends on the amount of damage. You can take to your local dealer for an estimate.