[subma77]

I have a 1999 mariner 125hp that is leaking water out of the top spark plug. Is this serious or is it just a gasket? Can it cause any major damage or should i get it fixed immediately? Can i do it myself? Also i cant seem to find the serial number anywhere on the motor? Thanks in advance.

[crappiejig]

Just a gasket should be item 23 here http://dougrussell.com/partscatalog/...270,300,10,150 double check your specific s/n. Get it done sooner rather than later,good diy job. Hope this helps.