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post #1 of 20 (permalink) Old 02-04-2011, 10:13 PM Thread Starter
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Spark Plugs

Went to the Honda dealership today to pick up some plugs. I had the NGK FR9BI in the RC. The parts man handed me a pair of Denzo's. What should have alerted me right away was when he told me the price of a single plug. $50.00 for one! So came home and started to do some research. These Denzo's do not cross-reference with the RC SP-1. So here's my question, what are these plugs to? Denzo VK24PRZ11 iridium?

Tried to do some searching to no avail.
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post #2 of 20 (permalink) Old 02-05-2011, 03:09 AM
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You had an SP1 plug and he sold you an SP2 plug! You should know better than buying parts at Honda shops unless you can not do otherwise.

RC51 Spark Plugs (all are Iridium plugs)
From Rogue site
SP1
FR9BI-11 (00-01 NGK)
IK27C11 (00-01 NIPPON DENSO)
SP2
IFR9H11 (02-03 NGK) 31919-MEB-671
IK27PRZ11 (02-03 NIPPON DENSO) 31919-MEB-672


From Honda Parts Catalog listed in a on online- discount parts Cycle-Parts.com (part number 19 on Front Head)

SP1

19 SPARK PLUG (IK24C11) (DENSO) (OPT) 1 $39.56
19 SPARK PLUG (FR8BI-11) (NGK) (OPT) 1 $11.63
19 SPARK PLUG (IK27C11) (DENSO) 1 $25.69
19 SPARK PLUG (FR9BI-11) (NGK) 1 $11.63

SP2

19 SPARK PLUG (IFR8H11) (NGK) (OPT) $13.69
19 SPARK PLUG (VK24PRZ11) (DENSO) (OPT) $12.14
19 SPARK PLUG (IFR9H11) $17.80
19 SPARK PLUG (IK27PRZ11) $10.23


The 24 is a hotter plug and corresponds to an NGK 8 and your manual is listing this as a possible winter riding plug, which translates to only use it if you are fouling plugs in the winter. The IFR is so rare that when you plug it in Google only RC51 and CR450xs come up!

NGK - ND (Nippon Denso, not Denzo) Heat Range
7 - 22
8 - 24
9 - 27

The 11 at the end is for the gap, they are pregapped to 1.1mm (1.05-1.15) and should not be manually gapped or may be damaged.

I wondered what's the difference from IK to VK and they are both Iridium but different lines (Iridium & Iridium Tough, there is also I.Plus and I.Racing in ND plugs) From ND's site:



IK series
IK16. IK20. IK22. IK24. IK27. IK31. IK34. IK16G. IK20G. IK22G. IK16L. IK20L
・ Mainly used for cars. ISO type. ・ 14mm dia. X L19mm length type. ・ IK22 and above are for tuned engines, with a spark gap of 0.8mm. ・ IK16G, IK20G, and IK22G have a solid, stainless steel gasket (mainly used with Honda engines). ・ IRIDIUM TOUGH VK16, VK20, and VK22 are also on sale at the same time. ・ IK□L is extended type (spark position 5mm)

VK series
VK16. VK20. VK22. VK20Y. VK16G. VK20G. VK22G
・ Mainly for automobiles and trucks ・ ISO-compatible small plug ・ Mounting base: 14 mm dia. X L19 mm ・ VK16G, VK20G, and VK22G have stainless steel gaskets. ・ VK20Y has a gap of 0.8 and is mainly for use with turbo engine vehicles.





If you are in the US go to Advance or AutoZone and get your plugs at around $9-11, you may also find equivalents to Honda oil filters in Purolator numbers as well as other brands at fraction of cost.

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Originally Posted by Rugid View Post
Went to the Honda dealership today to pick up some plugs. I had the NGK FR9BI in the RC. ........... Denzo VK24PRZ11 iridium?

Last edited by ZeroGara; 02-05-2011 at 04:05 AM.
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post #3 of 20 (permalink) Old 02-05-2011, 08:11 AM
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Take the Denso plugs back....NGK is a way better plug. In some of my other bikes I have to changed plugs early and found Denso plugs in the bike. (This was more in the '90's of course. I believe Honda learned their lesson and mostly use NGK in the performance bikes.



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post #4 of 20 (permalink) Old 02-05-2011, 09:49 AM
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Wow! Thanks ZeroGara for that breakdown on all the plugs. That was a great piece of homework. Very useful for me...

John, 2000 RC51 #000100


Last edited by jondog9; 02-05-2011 at 09:50 AM. Reason: it's early morning, haven't had coffee
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post #5 of 20 (permalink) Old 02-05-2011, 10:01 AM Thread Starter
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Quote:
Originally Posted by ZeroGara View Post
[FONT=Verdana][SIZE=2][B][B]

If you are in the US go to Advance or AutoZone and get your plugs at around $9-11, you may also find equivalents to Honda oil filters in Purolator numbers as well as other brands at fraction of cost.
I'm actually having a hell of a time finding the NGK's. I live in Canada where there are only a few resources. Thanks Zero for the info.
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post #6 of 20 (permalink) Old 02-05-2011, 12:49 PM
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Yeah but $50 damn....

The exchange rate isn't that bad between Canada and the US yet....



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post #7 of 20 (permalink) Old 02-05-2011, 12:59 PM Thread Starter
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Quote:
Originally Posted by madbuyer View Post
Yeah but $50 damn....

The exchange rate isn't that bad between Canada and the US yet....
Pretty bad when I have to import a set of plugs, but yes I'll be definitely importing my next set.
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post #8 of 20 (permalink) Old 02-05-2011, 04:22 PM
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I picked up a set of 4 NGK plugs for $60 all in shipped to Canada through ebay..
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post #9 of 20 (permalink) Old 02-09-2011, 05:09 PM
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So, does anyone know how big of a difference is there between SP1 and SP2 plugs? I've never had them side by side.
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post #10 of 20 (permalink) Old 02-09-2011, 08:36 PM
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Well they're all iridium tipped, and I was surprised there was a difference between SP1 and SP2 variants when I first read the service manual.
I'd have to grab the Denso and NGK plug charts to see what the difference actually is.
Offhand, I'd say that if the heat range is correct, you should be able to use either plug in SP1 or SP2.
I've always found NGK to be more available than other plug brands.
Been using them for decades.

Last edited by SubSailor; 02-09-2011 at 08:43 PM.
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