Problem with Suzuki DF115

[Bushmaster]

Over the past year '01 DF115 has been running rough at idle about half the time, then boggs and runs smooth after I throttle up. #2 plug seized in hole and shows orange deposits on electrode. Compression is fine and other plugs normal. Have changed out 10 micron water separator numerous times. Anyone have a clue how water is getting in the cylinder and how to go about repair. Thx.

[rongarrett]

Blown head gasket? Replace?

[haleraiser2]

Getting water in cyl. Further investigation will need to be done. Pull powerhead and cyl head look for corrosion around cylinders on head and block.

[Bushmaster]

I'm somewhat mechanically inclined, but never pulled a head before. Anyone know how difficult it is on a DF Zuke? Furthermore, if there is the suspected corrosion is the motor junk or do I get the block decked a new head etc.? Could it be the gasket just needs replacement and how would I know if the head and/or block isn't warped if corrosion isn't present? I'm just trying to figure out if this '01 motor is even worth tearing down. Thx