Black Plugs / what now ?

[wildtalk]

These plugs ( attached picture ) have less then 10 hours run time in a johnson 150 hp 1987. I had motor service just a month ago . I replaced them with spare set I had on standby. question is what do I need adjust ? Plug gap ? oil ? Oil Mix ( its an auto mix injection ) or change plugs type . They are Champion QL77JC4. Any and all help will be welcomed