Johnson 115hp Bad Cylinder

[dreadinger]

I have a 1992 TJ115TLEND that has a bad bottom starboard cylinder. I am in the process of removing the power head but it appears that a ring broke and is wedged in one of the ports and there is only some slight scoring in the cylinder. The other cylinders look perfect. I just got this boat and motor knowing the motor was bad so I don't know what the old owner did. If all checks out to my advantage I plan on honing, a new piston and new rings all the way around. My question is with the "good" condition of the other cylinders what might have caused this failure?

 

[bassboy1]

Do you know why the engine blew? If you don't know that, you don't want to rebuild that cylinder, as it will eat another piston ring. I think you mentioned at one point that the muffs fell off for the previous owner? If it is a water related problem, I don't yet have the experience to know how far behind the other 3 cyls. are when one blows. However, it is very common for 3 cyls. to be perfect, and one dead on blown V4s that had a fuel delivery (think where the oil is in 2 strokes) related problem. I if I am remembering correctly, your motor has twin double barrel carbs, correct? And they are horizontal, not vertical, right? (IE, the top carb feeds cyl. 1 and 3, and the bottom carb feeds cyl 2 and 4).