Spark Plugs and Gap for 91 Merc 260

[P7M89MM]

I have a 1991 Mercruiser Bluewater Ski with serial number D624197. From what I can tell, the NGK BR6FS is the correct plug. I'm seeing different gap recommendations though of 0.035 or 0.040. Can anyone help?

Thanks!

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[JasonK]

My 1990 Merc B.W.S. Ser #OD379792 takes AC Delco AC-MR43T with a gap of .016, Timing at 8 deg. BTDC, dwell at 27-31 deg.,

Right from the original engine carb cover.

[P7M89MM]

My 1990 Merc B.W.S. Ser #OD379792 takes AC Delco AC-MR43T with a gap of .016, Timing at 8 deg. BTDC, dwell at 27-31 deg.,

Right from the original engine carb cover.

Thanks! The MR43T matches the NGKs I listed. From another thread I read, .016 is points gap correct?

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[JasonK]

Sorry, I thought it was the plug gap. I guess it is the points gap.

I think the plug gap is ,035, but not sure. I'll have to check.

[P7M89MM]

Jason, you're correct. Went ahead and just called Mercury this morning with my serial number. 0.035.

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