92 johnson 175

o.k. guys, couldnt help myself. just went outside and took a close look at my engine. not seeing much external corosion. relays on top of carbs are a little rusty but, they pulled out ez enough. a little corosion on hot wire at selinoid but its the green tighten me up kind, not the white ur screwed kind. pulled the plugs, they were only hand tight, and the plugs had a little rust around the little pole thing. just a little but, that cant be good. lookin through plug hole i could see some corosion. it was the white ur screwed kind. butterflies have a little corosion but, they are opening and closing fine. STUPID QUESTION- back of motor says ois 2000. does that meen motor is 2000 model? hour meter reads 216