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  1. 06-18-2015, 08:02 PM #1
    Bullred
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    Question 2.5 efi 200 hp

    Why does it seem like most 2.5 efi's loose the #4 when they blow Is their a common issue? I've had two of them blow an it has been the #4 both times. Curious if anyone else has had the #4 pop or just my experience.
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  2. Von
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    #2 06-18-2015, 10:48 PM
    I see more #2 holes go. #2 usually goes from heat, detonation, lean mixture or a combo of everything..

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  3. EuropeanAM
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    Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #3 06-20-2015, 10:40 AM
    Can't really state what's causing your failure without visual inspection of the piston and cylinder.

    I've seen failures in any one of the 6 cylinders... numerous potential causes.


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