Here’s a couple of pictures of Speeditwins that fall into that category. One is a refinished motor, the other is bone stock original. Colours should be accurate enough to use as a guide.

The exhaust housing has a water jacket on top to keep heat away from the fuel and that seems to be enough to protect the paint on the entire housing. Many members use a heat resistant paint as added insurance. There are usually other signs of cooling system failure so a color change in the paint is unnecessary . . . 😆

That doesn’t look too bad. Once you get the motor together with the right parts polished and a new decal it will look great. It’s hard to tell what the true original colors looked like as most originals have faded and gotten stained with oil over the many years. Yes will only get better with age.