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Old 14-03-2007, 01:37 AM   #1
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Correct spark plugs for 200HP

Hi, For those following my other threads, you'll know that I have a 2003, Mariner, 200HP (I believe you would call it "a fishing engine")

When I check on NGK's web site http://www.ngksparkplugs.com/apps/de...000&country=US

They state that the correct plug, for my engine, is a BPZ8HS-10, as in picture 1. When I checked my engine, it has NGK BUZHW plugs in it, that look like picture 2, Surface Discharge type plugs.

Any ideas why? Is it recomended to use them? Can anyone suggest a supplier for whatever is the correct, for my engine? Please.

Peter
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Old 14-03-2007, 02:37 AM   #2
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Most people run B8HS-10 in merc V6's as they reach into the cylinder as apposed to the surface gap plugs.
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Old 14-03-2007, 08:02 AM   #3
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But surface gap plugs are less prone to fouling?
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Old 14-03-2007, 08:44 AM   #4
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Quote:
Originally Posted by Matt View Post
But surface gap plugs are less prone to fouling?
Thats what i thought?
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Old 14-03-2007, 10:28 AM   #5
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I run with the type in picture one mainly because you get better spark and they are cheaper however i would have thought you would need a --9--- rated plug as your waters are warmer than ours.
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Old 14-03-2007, 11:43 AM   #6
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I would have thought that if you were planning on removing the variable-metering oil injection and run a fixed ratio then you would do better to err on the side of a plug variety less prone to fouling?

Also, wouldn't running a 'protruding' type plug move the flame front nearer to the crown of the piston at ignition and cause holed pistons over time, even if you were using the correct heat grade?

(Just my thoughts. Please correct me if I'm wrong as I'd like to learn more about this engine too seeing as it's the same as mine... )
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Old 14-03-2007, 12:04 PM   #7
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Hi Burnett,

The plugs that are recommended (by NGK) for my engine, are the 'protruding' type plug. the plugs I have in the engine are the "Surface Discharge " type (the second picture. I believe the "Surface Discharge" type are less susceptible to clogging.

Someone will know what the right setup should be, it's only a matter of time.

Peter
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Old 14-03-2007, 02:20 PM   #8
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I suspect either will work just fine, so I really wouldn't worry about it to much.
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Old 14-03-2007, 02:38 PM   #9
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For older (i.e. 80's and 90's) carbed 2.4's and 2.5's merc recommend the surface gap type (2nd pic)



Only seems to be the other type for post 2003 motors
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Old 14-03-2007, 09:29 PM   #10
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mines always had the surface gap in from new and its a 99 200
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Old 14-03-2007, 09:34 PM   #11
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It's strange that NGK recomend the other plug, without an alternative. Maybe the company who my engine came from, know more than NGK, lucky for me.
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Old 15-03-2007, 12:45 AM   #12
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I think NGK (along with most plug manufacturers) will always recommend a 'Nearest equivalent' along with a disclaimer at the bottom of the chart saying 'To the best of our knowledge this is right, but check with manufacturer first, etc...etc'

I once had an Alfasud car, and Alfa Romeo said ONLY to use the 4 electrode 'Lodge' branded plugs whereas Champion advised a standard looking plug (like Pic 1) Needless to say I took the word of the engine maker rather than the plug supplier!
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Old 15-03-2007, 12:57 AM   #13
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Don't get hung up on it, on a 200hp fishing motor either will be fine.
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Old 15-03-2007, 11:57 AM   #14
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Just found this, everywhere I look they recomend the same ?????????

BPZ8HS10
NGK Spark Plug
Traditional Spark Plug fitting later model Mercury V6 engines with CDM ignition 2000 & up.

How will I check if I have CDM ignition?

Peter
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Old 15-03-2007, 07:49 PM   #15
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Get the serial number, then ring up E.P. Barrus (the importer) and ask their advice? They'll know exactly what fits I should imagine. Jay Smith will know too. There isn't much he doesn't know about these motors by the looks of things.

You could also email Mercury themselves if you wanted to, or maybe there's be some downloads of interest here:

http://www.brunswickmarineemea.eu/do...main?type=corp
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Old 15-03-2007, 08:38 PM   #16
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Thanks for the link, I'll look at it now.

I have been told that my number engine should be an EFI but I can assure you it's not.

These are the original registration details. Don't know if they make sense to you.


Product Information
Serial Number: 0T702356
Model Number: MAR 7200422MY
Model Year: 2003
Description: MA-200XL SWR
Product Status: On-line regist.




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Old 15-03-2007, 09:01 PM   #17
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Serial numbers for a 2.5 carb engine.
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Old 16-03-2007, 12:11 AM   #18
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have a look on top of your plastic cover that goes over the flywheel,should say what plugs you need.
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Old 20-03-2007, 02:41 PM   #19
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year 2000 and later Mercury 200HP use a newer ignition system.
they use a total different ignition system.
there are no power packs (switch boxes) on these engines and the coils are different also.
i am led to believe this ignition system is not as strong as the traditional ignition system.
for that reason the 2000 and later use a "J" style spark plug as opposed to a surface gap spark plug.
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Old 20-03-2007, 04:13 PM   #20
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Hi All,

Well it looks like I need 2 new sets of plugs (1 spare). On the flywheel cover it states that the BPZ8HS-10 plugs should be used, with 1mm gap.

Thanks All.

Peter
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