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I recently purchased a Yamaha outboard F150. I have logged 45 hours on it. There is an small rectangular opening on the back of the motor, just below the cover and above the oil drain. I recently noticed that there was a black oil residue (soot) below the rectangular opening and on the cowling at the join to the lower unit. Is this an exhaust outlet and is this soot built up normal? Thank's in advance for your response.

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The opening you see is a vent for crankcase gases. Any deposits at this point simply means your motor has
A:been working hard, (too much full throttle) or
B: is a bit long in the tooth.
Keep the opening clear(don't allow it to become blocked) and ease off on the throttle somewhat. Once you notice oil dripping is when you may consider rebuilding ie change piston and rings and rebore. You will notice the exhaust on the stem becoming blocked with oily carbon before this point is reached
You will notice oily deposits throughout the motor but as long as you still have reasonable performance you need not worry.

Posted on Aug 29, 2010

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Posted on Jan 02, 2017

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