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Author Topic:   NGK Spark Plugs for Mercury 90-HP 2-stroke
jimithing posted 06-24-2004 03:45 PM ET (US)   Profile for jimithing   Send Email to jimithing  
I just spent $31 for a spare set (3) of NGK plugs [of unspecified type] for my Mercury 90 Saltwater 2 stroke. Why do these plugs [of unspecified type] cost so much?

Do these plugs foul less often than others and as a result require to be changed less often?

I have never spent that much money for three spark plugs in my life?

jimh posted 06-24-2004 05:54 PM ET (US)     Profile for jimh  Send Email to jimh     
Most NGK plugs are about $3. Try next time.
Backlash posted 06-24-2004 06:12 PM ET (US)     Profile for Backlash  Send Email to Backlash     
Are they the platinum plugs? If so, they are supposed to last longer.

I just ordered 2 sets of NGK BR8HS10 resistor plugs today for $2.43/each.

Backlash posted 06-24-2004 06:50 PM ET (US)     Profile for Backlash  Send Email to Backlash     
Check this link:

cmarques posted 06-24-2004 06:59 PM ET (US)     Profile for cmarques  Send Email to cmarques     
I spent over $40.00 for 3 plugs last year for my Merc 90 2 stroke. Don't know why but they weren't cheap. I got them from Parker Boats in Orlando- the only out of 12 places I called that stocked them. They are NGK BUZHW-2's. A search on this site will probably find me whining about the price then too. After installed, the engine idled much better and cold started better so I guess it was worth it. I'll probably get another set later this year and plan to change them yearly.


dgp posted 06-24-2004 07:34 PM ET (US)     Profile for dgp  Send Email to dgp     
On I have to buy a box of 10 for $21.90 or I can go to and by four plugs for $12.72 and have them shipped to my nearest dealer.
jimh posted 06-24-2004 08:01 PM ET (US)     Profile for jimh  Send Email to jimh     
I think my local Mercury dealer keeps that NGK BUZHW-2 plug in stock and sells it over-the-counter for about $3.
MantyMonty posted 06-24-2004 08:15 PM ET (US)     Profile for MantyMonty  Send Email to MantyMonty     
I also bought three NGK's today. I stopped in at Twin Cities Marine today and Sue gave me the NGK BUHW-2 plug number for my '04 90 Mercury 90 2-stroke Saltwater. I then called Mercury Technical Services in Fondulac, and they also gave me the NGK BUHM-2 as the plug required by my serial number/model. I asked him if the Z model(resistor) plug was necessary, and they told me not if I don't have radio interference. Finally, I wound up buying them at a local Fleet Farm store for 2.19 each.
newt posted 06-25-2004 08:02 AM ET (US)     Profile for newt  Send Email to newt     
See this thread:

Nobody seams to stock the NGK resistor plugs for this motor. I just bought some last week from for about $7.50/each plus delivery. I have looked for them locally at West Marine, Boat US, Boater's World, and every auto parts store around. No luck.

I have owned my 2003 Mercury 90 2-stroke classic since July of 2002 and have yet to change the plugs. Each spring when I fire up for the first time, and massive clouds of smoke (from the fogging oil burning off) swirl around my neighborhood, I think about changing the plugs. Then, I go to buy them, can't find the correct ones, and end up running the originals, and keeping three of the non-resistor types on board as spares.

Now at least I have the correct spares. Maybe I will even change the plugs. :)

MantyMonty posted 06-25-2004 10:30 PM ET (US)     Profile for MantyMonty  Send Email to MantyMonty     
Stopped in by Sue at Twin Cities Marine today and bought three NGK BUZHW-2 plugs this morning. They were 14.00 something a piece. Sue was amazed when she looked up the price, as was Cheryl in the parts dept. Oh well, at least I have them for the weekend if I need them, which I honestly don't think I do. But you never know, and try to find something like that on the weekend of the fourth.
jimh posted 06-25-2004 10:58 PM ET (US)     Profile for jimh  Send Email to jimh     
If the original poster is talking about the NGK BUZHW-2 type spark plug (he never really specified which NGK plug he was pricing), these cost $8.69, even on, which usually has near-bottom pricing. So it is not surprising that at retail at a marine parts counter they would be over $10/each.

Resistor plugs from NGK with the "Z" designator have an inductor/resistor to help suppress radio-frequency interference, and this, apparently, contributes to their cost being higher than a simple resistive element being added to the plug, which is what is done in most any other "resistor" plug.

Backlash posted 06-26-2004 09:09 AM ET (US)     Profile for Backlash  Send Email to Backlash     
....or $7.64 here:
John O posted 06-26-2004 07:09 PM ET (US)     Profile for John O    
I bought mine last week (NKG BUZHW-2) from Cabela's for $31.00 shipped. They are expensive little buggers. I think I will use the old ones (67 hours on them) to fog down my motor (Merc. 75hp 2 stroke 2001) at the end of the season and replace with the new ones I just bought. Does this make sense ?
Dick posted 06-26-2004 08:00 PM ET (US)     Profile for Dick  Send Email to Dick     
Mercury states that the proper plug is the NGK BUHW2 but that the BUZHW2 can be used if there is excessive radio interference.
The Mercury suggested list price for BUHW2 is $3.95 and $14.18 for the BUZHW2, that's a $10.23 difference to get the inductive resistor. It's a waste of money unless you get radio interference. The resistor plug will not last any longer nor will it make your engine run any better.

Another option is that you can get a noise filter at Radio Shack for about $20.00.


John O posted 06-26-2004 11:13 PM ET (US)     Profile for John O    
Mercury Manual 2001 2 Strokes 75/90 hp Manual (PAGE 30) recommends:


Dick posted 06-27-2004 01:31 PM ET (US)     Profile for Dick  Send Email to Dick     
The Mercury electronic parts catalog at work shows the BUZHW2 as an option.

Owners manuals are printed in advance and not updated untill the next printing cycle, sometimes never.

We service a lot of Merc outboards and have never stocked the BUZHW2. If they were required we would stock them and our techs would be installing them.


Matthew posted 06-27-2004 02:52 PM ET (US)     Profile for Matthew  Send Email to Matthew     
My 2002 Mercury 90 2 stroke came equipped with the NGK BUZHW - 2, which are factory recomended according to my manual. I have nothing to compare the plugs performance to, but haven't had any of the cold-starting problems that are sometimes associated with this engine. The Mercury mechanic also didn't have the plugs in stock, but was happy to order them.
uglyst posted 03-14-2010 05:58 PM ET (US)     Profile for uglyst  Send Email to uglyst     
I have ran BUHW-2's in my '99 90HP Merc for the past 8 years. Got BUZHW-2's when I had some work done at the shop. Have not seen a lick of difference. Will be back to z-less plug this spring.

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