Oily film on inside of airbox- 1977 Evinrude 75hp

[BonairII]

Took off my airbox today to tear down my carbs and replace all fuel lines etc....and noticed a mild oily 'sheen' on the inside of the airbox. I had completed cleaned the airbox a few days ago when I first got the motor, so I know the residue wasn't there before.

Is this normal?

 

[Faztbullet]

Re: Oily film on inside of airbox- 1977 Evinrude 75hp

Yes....

 

[BonairII]

Re: Oily film on inside of airbox- 1977 Evinrude 75hp

Good to hear. My previous motors didn't have an airbox so I had no idea what to think of the residue.

Thanks.