Spark Plugs
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Randy B
Road Warrior
Palm Bay FL
Posts: 2,540
Joined: Apr 2013
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06-12-2015 11:57 AM |
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The ferret
Forum Moderator
Ohio
Posts: 31,335
Joined: Apr 2013
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RE: Spark Plugs
good price! (If $15 for a single spark plug could ever be considered a good price)
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Defender of the Realm
2014 DLX (the pleasure horse)
2021 NC750X DCT (Angry Bird)
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06-12-2015 12:03 PM |
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Cormanus
Moderator
Queensland, Australia
Posts: 20,705
Joined: Dec 2013
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Spark Plugs
My plugs were replaced, maybe at 24,000 kms. My recollection is that the mechanic thought it probably wasn't necessary.
They were expensive as I recall.
(This post was last modified: 06-12-2015 12:20 PM by Cormanus.)
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06-12-2015 12:20 PM |
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The ferret
Forum Moderator
Ohio
Posts: 31,335
Joined: Apr 2013
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RE: Spark Plugs
Ok just looked it up in the service manual
spark plugs: inspect at 4000 replace at 8000 inspect at 12,000 replace at 16,000 ect GADS!
BTW Tighten to 12 ft lbs is spec when replacing.
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Defender of the Realm
2014 DLX (the pleasure horse)
2021 NC750X DCT (Angry Bird)
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06-12-2015 01:49 PM |
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Redbird
Running Like a Top
Colorado, USA
Posts: 273
Joined: Apr 2015
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RE: Spark Plugs
Hmm, I believe I will take some leeway here. Perhaps replace at a minimum of 12,000.
Back when I had my Valkyrie Honda said replace at 8,000. I replaced them at 24,000 just because. The bike was running fine.
You know, I just replaced the plugs in a 2002 Toyota Highlander at the recommended interval of 120,000 miles. They are iridium tipped and were only eight dollars and change each at Advance Auto Parts. Half the cost of the Honda plugs and 15 times the life before recommended replacement.
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06-12-2015 01:55 PM |
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Randy B
Road Warrior
Palm Bay FL
Posts: 2,540
Joined: Apr 2013
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RE: Spark Plugs
The air cooled engine has something to do with it.
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06-12-2015 02:02 PM |
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Flynrider
Been There
Phoenix, AZ
Posts: 3,233
Joined: Apr 2013
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RE: Spark Plugs
(06-12-2015 02:02 PM)Randy B Wrote: The air cooled engine has something to do with it.
I suspect that the absurdly long nose is for better heat transfer from the cylinder head. Honda also put extra oil passages around the plug heads to improve cooling in that area.
Of course, my air cooled CB750 uses $5 standard sized plugs and no special oil passages for cooling, but combustion chamber temperature control was not that critical with the emission standards of 20 years ago.
Phoenix, AZ
2013 CB1100 - Big Red
1993 CB750 Nighthawk - Tahitian Blue
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06-12-2015 04:56 PM |
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sourdough44
1st Service Completed
Wisconsin
Posts: 156
Joined: May 2015
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RE: Spark Plugs
Thanks, great info. Plugs at $5 or $20 are till relatively cheap. No issues here, I like to upgrade plugs as called for when it calls for on replacement. That often calls for iridium on replacement.
I had a 2003 GMC truck, I had two upgrades to the original replacement plugs.
14 CB1100
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06-12-2015 07:54 PM |
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Randy B
Road Warrior
Palm Bay FL
Posts: 2,540
Joined: Apr 2013
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RE: Spark Plugs
(06-12-2015 04:56 PM)Flynrider Wrote: (06-12-2015 02:02 PM)Randy B Wrote: The air cooled engine has something to do with it.
I suspect that the absurdly long nose is for better heat transfer from the cylinder head. Honda also put extra oil passages around the plug heads to improve cooling in that area.
Of course, my air cooled CB750 uses $5 standard sized plugs and no special oil passages for cooling, but combustion chamber temperature control was not that critical with the emission standards of 20 years ago.
The oil was all about controlling the cylinder head temp to stabilize it for better emission regulation out of the engine. This is the only air cooled engine I have ever seen with a catalytic converter on it, and that is for a reason. The unpredictable and wide ranging head temps would make it so the converter would clog up in short order. With the oil passages in the head it helps keep things much more controlled and allows the bike to pass much tighter emission standards.
Fun stuff.
(This post was last modified: 06-13-2015 12:40 PM by Randy B.)
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06-12-2015 08:00 PM |
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Cormanus
Moderator
Queensland, Australia
Posts: 20,705
Joined: Dec 2013
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Spark Plugs
Somewhere on this forum there's a discussion about the likelihood that the plugs could be expected to survive much longer than 12,000 miles.
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06-13-2015 01:47 AM |
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