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Thread: Spark Plugs
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02-28-2021, 01:31 PM #15000 RPM
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Spark Plugs
Using NGK BU8H (surface gap, non-resister, OEM) and BUZ8H (surface gap, resister) in all of my outboards (mostly V6's). They seem to last forever and never need adjustment.
Any advantage (or dis-advantage) expected in trying a gapped plug like B8HS or BPZ8HS-10?
...or is there an iridium equivalent that could be tried as well? I see there is a Denso IWF24 that matches physically, but not sure what to think of the heat range.
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02-28-2021, 01:59 PM #25000 RPM
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Looks like NGK BR8HIX is the iridium matchup.
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02-28-2021, 05:56 PM #3
I use Br8hs-10’s because they run good, are easy to read, and cheap.
'95 STV "The Blue Goose"
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Glastron1987 thanked for this post
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02-28-2021, 08:13 PM #45000 RPM
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Glastron1987 thanked for this post
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02-28-2021, 08:59 PM #55000 RPM
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Thanks. BR8HS-10's do look like an economical choice and they are resistor as well. Maybe I'll given them a try.
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06-02-2023, 07:59 PM #65000 RPM
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So I tried the BR8SH-10 in place of the BUZ8H's I have been using for years in my XR4. They seemed to run fine except at low speed they rean rougher. I suspect they only needed to be run a little leaner at low speed. So, I was planning to make a minor low speed adjustment, but then remember that my particular carbs have jets even for low speed. So, I went back to the BUZ8H's, I don't want to mess with the jets. At least I gave it a try.
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cdubya thanked for this post
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06-02-2023, 09:27 PM #7
The -10 means that they come gapped @ 1.0 mm. Which is .03937 .. just call it .040
There is no reason to run that wide of a gap ... especially with a low output ignition.
Try closing them down to .025 - .030 .. it will quit shootin ducks down low ..
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Glastron1987 thanked for this postOnPad, Glastron1987 liked this post
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06-03-2023, 05:26 PM #85000 RPM
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Yeah I'll try that after getting a good gauge
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07-20-2023, 01:49 PM #9Junior Member
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I take it the br8hs-10's are suitable for all merc v6's?
no clearance issues on a 2.0 l?
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07-21-2023, 06:29 PM #10Screaming And Flying!
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07-23-2023, 09:26 PM #11Junior Member
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Minty thanks. Surface gap plugs are strange to me. Wouldn’t mind trying to decipher a normal plug while tuning
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07-24-2023, 08:25 AM #12
An oldie ... but goodie
https://www.strappe.com/plugs.html
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