NGK Spark Plugs - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 11 (permalink) Old 05-04-2011, 02:32 PM Thread Starter
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NGK Spark Plugs

Gents,
Does anyone have recommendations on what type of Spark Plugs are best for the RC51 ?

I have read up on Iridium series and from what I have seen they are rated rather high, but so is the NGK Platinum series also.

Any thoughts ? Is there a better plug ?
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post #2 of 11 (permalink) Old 05-04-2011, 05:27 PM
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OEM plugs for RC51s. Normal heat range.

SP1 plugs:
NGK FR9BI-11
Denso IK27C11

SP2 plugs:
NGK IFR9H11
Denso IK27PRZ11

NGKs are hard to beat. And always have been.
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post #3 of 11 (permalink) Old 05-04-2011, 08:34 PM
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NGK is the way to go

2001 Honda RC51 SP1
1996 Honda CBR 900RR
2003 Aprilia RSV Mille R
1999 Aprilia RS50
2012 Triumph Daytona 675R (Sold)
2010 BMW S1000RR (Sold)
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post #4 of 11 (permalink) Old 05-05-2011, 12:01 AM
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Oem Ngk iridium is the only way to go. Denso is also oem but haven't had much luck with them.
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post #5 of 11 (permalink) Old 05-05-2011, 09:38 AM Thread Starter
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Thanks guys....will place my order today !
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post #6 of 11 (permalink) Old 05-05-2011, 06:07 PM
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Remember...the iridium plugs come pre-gapped.
No need to gap the plugs, and the tip may be broken or damaged if you try!!
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post #7 of 11 (permalink) Old 05-06-2011, 06:42 PM
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Question ??????

hey Sub, have you done the 1000rr reg upgrade? I read somewhere that you had to run different plugs if you did the upgrade. Any truth to it, cause I love the NGK's !!! Hoovy

Satos, CF Sir box & snorkel,Mr front and rear fender & dash cover, custom carbon V cowl, Black ASV levers, Power com III, Hot Bodies tail, Galfer lines, Vortex Clip ons.
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post #8 of 11 (permalink) Old 05-06-2011, 08:18 PM
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Quote:
Originally Posted by HOOVY View Post
hey Sub, have you done the 1000rr reg upgrade? I read somewhere that you had to run different plugs if you did the upgrade. Any truth to it, cause I love the NGK's !!! Hoovy
No I have not made the change.
One difference is the coil pack system used on the newer bikes snaps over threaded tips of the plug tops.
The NGKs ordinarily used do not have the removable screw on tips they used to use years ago. So the coil pack won't fit onto the plug.
I believe that is one reason a different plug is used, one that uses a threaded tip.


Last edited by SubSailor; 05-06-2011 at 08:29 PM.
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post #9 of 11 (permalink) Old 05-06-2011, 08:24 PM
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Thanks SUB !!!

Yo are the man I knew you would know the answer!!! Why couldn't you just change the plug wire end???? Would that not work?? Thinking about the new reg mod while I'm down among others like headlights ( halos & maybe Audis too as signals) and I figured they would weigh a little heavier on the stock reg.
Again Thanks Sub you are the man. Hoovy

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post #10 of 11 (permalink) Old 05-06-2011, 08:36 PM
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Quote:
Originally Posted by HOOVY View Post
Yo are the man I knew you would know the answer!!! Why couldn't you just change the plug wire end???? Would that not work?? Thinking about the new reg mod while I'm down among others like headlights ( halos & maybe Audis too as signals) and I figured they would weigh a little heavier on the stock reg.
Again Thanks Sub you are the man. Hoovy
The coil packs are integrated hi-tension coil and plug cap.
You can't change the connector inside them.
You have to change to a plug that can accommodate the connector design.

Used to, plug manufacturers used screw on aluminum caps that could be removed to accommodate either connector type.
I was first surprised that the recommended NGKs had solid, non-removable caps.
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