Looking for guidance on honing scored cylinder wall on Mercury 115

[StarcraftSF]

I have a 2004 Mercury 115 Optimax DFI 2 stroke inline 3 1.5l outboard. I aquired this motor used with the middle cylinder with no compression, upon removal the rings were seized as thought. My question is regarding the middle cylinder wall, it is scored but not sure when a cylinder is beyond honing, really dont want to get into over boring or replacing sleeve if thats even possible. Ive read that a ball hone is what i need? Do i need to chamfer the port edges with some kind of grinding stone after honing, ive added a photo of the cylinder wall scoring, hopefully someone can tell me if i can bring it within 10 psi of the top and bottom cylinder which look great and have great compression, also is there anything else i need to replace besides the middle piston, rings on all 3, and top and bottom crank seals? I read somewhere about replacing the connecting rod bolts? When i pulled the oil tank a balled up piece of plastic came out which i beleive was constricing oil to the pump causing my issue with the middle cylinder but if anyone else has an idea what made it fail id love to hear, the water pump was in good shape.

 

[racerone]

Honing won't fix that !!----It needs to be bored.

 

[oldman570]

Honing won't fix that !!----It needs to be bored.

Time to dig deeper into ones pockets for a sleeve, rings, gaskets, and new piston , in order to get the motor back to running correctly again.

 

[jimmbo]

Time to dig deeper into ones pockets for a sleeve, rings, gaskets, and new piston , in order to get the motor back to running correctly again.

I doubt sleeving is needed for that bit of scoring

 

[Faztbullet]

That cylinder needs bored over size as min as possible.The reason you do this is there is no way to richen up cylinder mixture .WSM makes a .010 and Merc is .015 oversize and it wont clean up at .020 max it will need to be sleeved. It will need gaskets/rod bolts/impeller/,and figuring out what caused it to fail as it wasn't the oil pump blockage as other cylinders would show oil starvation also.Problems to look at are ECU an injector's(air and fuel)