"gary" wrote in message
ups.com...
i have a 1998 9.9 gamefisher i have some question i hop i can get some
help with.

1. approx how much compression should it have?
Depends on the engine, and specs. My 7.5 Gamefisher
has about 85 Psi. I think 60-ish is probably the low end.

2. can you get an accurate reading by just pulling the rope?
Yes. If you have a good compression gague, it will have a
good one-way shrader vale where you can keep puling like
hell, and it will record the "highest" reading of all the pulls.

does that
spin it faste enough, long enough?

Yes. Its not a "long enough" thing anyhow.


3. if one cyl is 30# less then the other, what might be the probable
causes be after head gasket has been eliminated? the cy wall looks
fine, no scratches, abrasions

Craked piston ring, or "stuck" piston ring - very common.
Since people seem to love to use that ****ty-ass petroleum
based 2-stroke oil which causes massive carbon build-up,
it tends to glue the piston rings into the grooves of the piston.
I'd almost bet on it.


i sure appreciate any help on this, i have really liked the
'spunkyness' of this motor and it ran well the past few years. my son
overheated it by backing in reverse for an extended period of time
while motoring around a small lake inlet.

That should not have overheated it - what makes you think
it was overheated? Was it like melt-down overheated, or
just hot-hot? "Overheated" (meltdown style) usually means
burning paint smell, melting wires, stops running, seizure, and
"oh ****, how do I get out of here, and what do I tell the ole lady".

Since you got the head off, might try to get a can of Gumout
choike and carb cleaner, and take that little red nozzle tube
and spray down into the edge of the pistons real good to
try to get it down into the ring groves. Make SURE to wear
goggles - getting Gumout in the eyes will temporarily blind
you, and you will need to craw to a water facet and flush for
min 1/2 hour. (can you tell I been there/done that?)






thanks in advance.. -gary