Spark Plugs - Can they be interchanged with another style from the same HP outboard ?

I

Invader169

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Jun 30, 2011
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I have a 1991 4 cyl 2 -stroke 115 HP Mercury Outboard (just recently acquired); I just bought new spark plugs from the Marina and once I pulled the old ones out they appeared to be different: Both are NGK - Quicksilver but the old ones are a gapped plug model # BP 8H N -10 while the ones the Marina sold me are flat headed (no end gap) model # BUHW.

I previsously owned a 1150 1979 6 cyl. Mercury outboard that had a similar style flat headed plug as the BUHW.

Can I actually used the BUHW in my motor or will i do some damage ?
 
j_martin

j_martin

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Re: Spark Plugs - Can they be interchanged with another style from the same HP outboa

Plug changed at s/n D283222. Below was BUHW, changed to BP 8H N-10.

I doubt the BUHW plugs would cause any damage, but they may have performance issues. Must be a reason why they changed.
 
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