1989 Mercury Blackmax 150 Hp Pistion

cvsa78

Cadet
Joined
Jul 21, 2008
Messages
13
What causes a piston to do this (see Pic)
 

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Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,824
Re: 1989 Mercury Blackmax 150 Hp Pistion

Timing, stale fuel, lean mixture ,idle stablizer bad,divider plate leaking which is my guess as it looks like some water ingestion on exhaust side of piston....
 
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