Compression issues on pontoon boat?

Question

1993 Crest Pontoon, 40Hp outboard motor. What should the compression read on the tester gage?

Answer 1

The difference between cylinders is more important than raw numbers.  If the lowest is within 7 percent or so of the highest, call it good.  7 to 12 percent or so, I'd do a decarb to try & recover some lost compression.  Any more than that or decarb doesn't help, pull the head to assess the damage.

step by step how & why to decarb your engine:

http://forums.iboats.com/showthread.php?...

Answer 2

with out knowing the model-it's hard to say but 100# to 140# just so long as they are all the same.