Black touch up paint

[NJRaised]

I got my hands on a 1980 XS. It’s pretty clean but needs some touch up. On the right side of the engine, on the side of the cans are two “painted black semi circles”. The paint is wearing off and I’d like to repaint it. SMe with the black paint behind the “YAMAHA” on the triple clamp up front.

Does anyone have a good high temp paint pen or solution to touch this up?

Thanks in advance