Ok I noticed this the other when I took my reeds out of both of my motors (1988 and 2004) and I noticed that my 88 motor intake was silver and not black like my 04 motor was. I am wondering why is one silver and one black?
it looks like ur second pic but idk if its ported and all of the black is gone were on ur cylinder still has some black
I vote cleaned stock jug! Nothing wrong with it! The black one is from the 2stroke oil not cleaned!
I believe they all start out painted black in that area but it tends to peel away ive seen them with, without, and half way in between.
I can't see Yamaha painting the stock inside intake, But I could be wrong!