Spark plug guide

Can anyone tell me where to find the size and gap spark plug for a 1980 mercury black max 150? Thanks.

NGK BU8H (6431) plugs. These are surface gap plugs so you don't have to set them.

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Originally Posted by redrivergar

Can anyone tell me where to find the size and gap spark plug for a 1980 mercury black max 150? Thanks.

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All I could find was this : http://www.iboats.com/mall/partfinde...n_id=347825048 ... and there is no "gap" in these plugs.

... cp :kewl

Thanks very much.