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Spark Plug Help??

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Old 05-31-2003, 08:21 PM
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Question Spark Plug Help??

Alright you marine motor heads.

The little cigarette is running a pair of 383's. One engine will max out at 5000 to 5100 rpm but the other will not go above 4500 rpm. Props were balanced and printed this last winter.

My first thought was maybe a fowld (Sp??) spark plug or two. Pulled one out and its an 'NGK 8 V-Power'.

The one I pulled does not seem to be overly carboned. Should I go back with these plugs or go to something else? And also, If NGK or whatever, what gap should I be looking at?

Any help would be great!

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Old 05-31-2003, 09:39 PM
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Had the same problem on my 500HP's years ago found out after changing plugs still would not wind up.

Changed plug wires found 2-3 with high resistance ran fine afterwards.
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