You are telling me I should pull the head before I order any parts then?
LOL.

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"Steve @ OutdoorFrontiers" wrote in
message ...

"Bob La Londe" wrote in message
...
I was fishing a tournament out of my little boat yesterday. I have a
1990
50HP Force model 507F90C on that boat. It suddenly started running
crappy.
I
pulled it off the main river and pulled the cowling. I pulled both spark
plugs to see what the condition was. The upper plug looked perfect, but
the
lower one was pretty clean except for some grey milky oil. Looks like
water
mixed in oil to me. I didn't have any choice, so I ran it back up river
to
the marina where I launched from. It ran on one cylinder all the way.

I just checked compression on it this morning. I got 152 PSI on the top
cylinder, and about 90 on the lower cylinder. I poured some two stroke
oil
in the lower cylinder to help lubricate the cylinder and see if the
rings
were bad. Even with a couple ounces of oil in the cylinder it still only
read 90 PSI.

I am guessing head gasket blown through to the water jacket. Pretty
simple
fix. Is there anything else I should look for?

I had a Force 75 hp, a 1995 model. I made the mistake of trying SplitFire
sparkplugs in the darned thing, even though it ran perfectly, I was trying
to get a little more out of it. It ran like a raped ape for a short
while,
then started missing and running crappy.

There was a hole burned in the side of the number one piston. The
mechanic
told me that this was a common problem with that particular engine. I
luckily I got the powerhead replaced under warranty.
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Steve @ OutdoorFrontiers
http://www.outdoorfrontiers.com
G & S Guide Service and Custom Rods
http://www.herefishyfishy.com