Double checking spark plugs

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thomasr

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I recently purchased a 1988 Mercury 20 HP. I ordered a carb rebuild kit, spark plugs and a couple other items. The old plugs that were in it were NGK BUHW which are a surface gap type plug. As per the Mercury Bulletin 91-36 I ordered NGK BP8H-N-10 but these are the conventional spark plug with the electrode. I want to trust the Mercury bulletin but at the same time I want to NOT bust the top of a piston on a too long spark plug. Just looking for a little assurance I got the right animal. Thanks.
 
thomasr said:
I recently purchased a 1988 Mercury 20 HP. I ordered a carb rebuild kit, spark plugs and a couple other items. The old plugs that were in it were NGK BUHW which are a surface gap type plug. As per the Mercury Bulletin 91-36 I ordered NGK BP8H-N-10 but these are the conventional spark plug with the electrode. I want to trust the Mercury bulletin but at the same time I want to NOT bust the top of a piston on a too long spark plug. Just looking for a little assurance I got the right animal. Thanks.
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Simple enough, put one in and keep the plug wire off turn the engine over slowly by hand. If you don't feel any interference or feel a clunk, you have it made.
 
I have run both in my 1990 25 Hp. Seems to run the same with either. I figured the one without the electrode protruding may be less likely to get fouled as the older style seems to have more surface area. Who knows.
 
I have a 1988 Mariner 20 hp which I belive is the same motor. I run the NGK BUHW with no problems or fouling.
 
I have a 1988 Mariner 20 hp which I belive is the same motor. I run the NGK BUHW with no problems or fouling.
 

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