Can't start the boat

[leeprice72]

I had a 95 112 Johnson burn up due to clogged jet, I had just had them all rebuilt ran good for a couple of weeks then started getting crappy. Would not idle I did not think much of it. We sat at a blue angels show in a little cove here got ready to leave and boat would not plane. I was about nine miles away from launch. Proceeded to run motor as much as it would go (big mistake) until it would die then recrank it until we got home. This would be lugging the engine. It blew up bigger than you know what and I never got a horn or nothing beside bad performance. In my case it burned up a cylinder. Bought a replacement used suzuki for that boat for way cheaper than fixing it. If you ever get that flywheel to spin check compression before wasting anymore time. You would probablly be better off looking for a powerhead to stick on it and be done with it. That is a pretty common engine there are many out there. Good Luck it really sucks when the engines won't cooperate.

[spareparts]

if you got rust on one plug, go ahead and pull the heads

[awthacker]

Okay, opened up the starboard side heads today. To me, they look really bad but I don't anything about engines. There is a grit in there, as well as some rust colored oil?

I think I know where the grit is from... when I was originally installing the engine after purchase, I tried to start it with the cowling on and the plugs out.... BOOM! Then I used the fire extinguisher and some overspray definitely entered the cylinders. I tried to clean it up best I could with seafoam, but never considered opening up the heads. I was a bit too timid to pull the heads and didn't know it was this easy or I would've cleaned it up a little better.

Anyway, I'm gonna wait to hear back from someone on what I should do next. It's not very easy to get to the flywheel through this optical ignition system, so I'll see if I can turn the prop and report back.

[chumbucket]

They all look bad to me. Also doesn't look like you had much cooling going on there either.

[awthacker]

As a quick update, the prop spins freely while in neutral, clockwise in forward, but not at all while in reverse.

I'm surprised there's not a gasket between these parts... just some kinda black silicone around the edges.

[awthacker]

Some pictures of the portside, which did not look quite as bad.

[awthacker]

And the starboard side again. One area of significant pitting on the edge of a cylinder and a pretty chewed up gasket around this fitting... what is this (looks like some kind of sensor to me)?

[awthacker]

Hope you guys don't mind me bumping this thread back up. I need some advice on what to do now that I've opened up the heads and found some nastiness inside.

I would summarize the options as: A) start the rebuild process and hope I learn something and not completely destroy my engine, or B) bring it to a mechanic for a rebuild.

Maybe rebuild is not what I need, but I'm not sure how I can get all this crud cleaned out without completely tearing it down, and I'm also not sure that I've found the source of the corrosion. I'm now guessing that the fitting I thought looked like a sensor is actually some kind of water jet/nipple for the cooling system and maybe the bad o-ring on it led to saltwater throughout the heads?

[spareparts]

pull the power head, take it apart, if you find the crankshaft rusted, your wasting your time with it, move on to the next power head

[RidgeRunner]

It Looks rusty and crusty. Could Deep Creep (blue in color if I remember right) have washed the 2 stroke oil away and caused it to rust the bore? Not familiar with it.
I agree with Spare, if the crank is rusty, move on. There should have been some head gaskets when the heads came off. Those heads look to be pitted, if it was into recently someone might have tried to silicone the pitting.