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Discussion Starter #1
Hi V Bikers,

The V OEM plug is NGK CR9EIA-9 (only one listed in manual)

Having seen that spark plug stick coil is made by Denso, being using Denso plugs. The plug listed was IU27.

However this plug change, being the guinea pig I would like to be, I trying the Denso IU27A. See the IU and IU-A spec difference below:

http://www.globaldenso.com/en/products/aftermarket/plug/power/lineup.html

Basically, the same plug with a slanted ground eletrode.

Have been about 1000 kilos now and IMO, It revs and starts easier...

Thanks and Ride Fast and Safe.:)
 

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Denso's IU27 is already being tried: http://www.kawasakiversys.com/forums/showthread.php?t=2571

IU27A's slant cut electrode results in a spark position of 1.0 mm compared to IU27's 0.7 mm, and a spark electrode height of 2.9 mm instead of 2.6 mm. http://www.globaldenso.com/PLUG/power/spec.html
IU27D, or IU27 (with removeable nut on threaded connector) are the taper cut ground electrode plugs listed for NGK's CR9EIA-9, but you should be alright.

Denso's Iridium Racing IU01-27 is interesting too with its all-platinum slanted ground electrode. Ground electrode projection is -1.8 mm instead of -0.5 mm, with -0.3 mm spark position and 1.2 mm spark electrode height.
http://www.globaldenso.com/PLUG/racing/spec.html
http://www.globaldenso.com/PLUG/racing/features.html
 

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I see the IU27D has a longer thread length than the IU27A. How does this compare to the OEM plug? I wouldn't want to put in a plug that is too long or to short.
 

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Discussion Starter #7
Denso's IU27 is already being tried: http://www.kawasakiversys.com/forums/showthread.php?t=2571

IU27A's slant cut electrode results in a spark position of 1.0 mm compared to IU27's 0.7 mm, and a spark electrode height of 2.9 mm instead of 2.6 mm. http://www.globaldenso.com/PLUG/power/spec.html
IU27, or IU27D (with removeable nut on threaded connector) are the taper cut ground electrode plugs listed for NGK's CR9EIA-9, but you should be alright.

Denso's Iridium Racing IU01-27 is interesting too with its all-platinum slanted ground electrode. Ground electrode projection is -1.8 mm instead of -0.5 mm, with -0.3 mm spark position and 1.2 mm spark electrode height.
http://www.globaldenso.com/PLUG/racing/spec.html
http://www.globaldenso.com/PLUG/racing/features.html
As Invader had pointed out, I realised there is a small spark eletrode height difference (0.3mm). Hence, I will be changing my plugs ASAP as have the IU27 in stock here at home.

What I would also do is clarify this issue with the my Denso dealer as he recommended the IU27A. However, I is my fault not to double check:thumbdown:.

If I have caused any confusion:confused: in the V world, sorry for this:(

Ride Fast and Safe.
 

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So the Denso OEM replacement plug would be the IU27, no (A) no (D) Correct?

Also, what would be the average price differnce? and can it be purchased at a regular automotive store?
 

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Discussion Starter #9
Hi Nortasaki,

I am 100% sure A-OK for the IU27 5363.
I am unsure of the IU27D as not seen it before.
Maybe possible the IU27D is not sold here in Malaysia (Lat 3 08 N long 101 42 E)
2 items to find out from my Denso dealer.

Not able to help you on the price and availabity part.
 

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Discussion Starter #10
V Guys,

I just read again an email I wrote to Denso Japan on the V.

[email protected]
[email protected]

date5 December 2008 14:43
subjectPlugs for Kawasaki Versys
mailed-bynotes.denso.co.jp

hide details 05/12/2008 Reply


Dear Sir.
Kawasaki Versys 650cc, 2cylinders.
We suggest IU27 Iridium Power ofr your nice Kawasaki.
IU27 dimensions are 10mm thread diamter, 19mm thread lenghth,16mm Hex.
IU27 ha world smallest 0.4mm Iridium alloy center electrode wich enhances your MC
power,acceleration.
As IU27 has golden terminal nut on top. please remove it by hand when istallation.
If IU27 is hard to find, IU27A is also applicable.
We attach IU27 picture ofr your reference.

(See attached file: IU.jpg)


Hope this clears the air, Best Regards.
 

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I see the IU27D has a longer thread length than the IU27A. How does this compare to the OEM plug? I wouldn't want to put in a plug that is too long or to short.
Like I mentioned above the pics, they are both the same length. Pics are there to show the difference between taper cut, and slanted ground electrode.

IU27D and IU27 are Denso's recommended replacements for NGK's CR9EIA9. They are both the same spark plug; IU27 has the removable terminal nut on the threaded connector, while IU27D doesn't. http://www.globaldenso.com/PLUG/cross_reference/1037_08.html

IU27D is a factory installed plug on some motorcycles that don't need the nut on threaded connector. (as with the Versys.)
For a Yamaha YZFR-1 (bottom of page): http://www.globaldenso.com/en/products/aftermarket/plug/config/index.html
Suzuki Hayabusa and B-King 1340: http://www.globaldenso.com/PLUG/topics/2007/10_1.html

-"Suzuki Genuine P/N for IU27D is 09482-00557... For aftermarket, IU27 can be used instead of IU27D."
You won't neccessarily get a Denso IU27D if you order a plug from Yamaha for a YZFR-01 (R1) though, and maybe even Suzuki's part # 09482-00557, as NGK's is a more available substitute.

IU27 and IU27A are easier to find than IU27D.
http://motors.shop.ebay.com/_Car-Truck-Parts-Accessories__denso-iu27_W0QQ_fromfsbZQQ_fxdZ1QQ_trksidZm270Q2el1313
 

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I did a search on this forum but nothing came out for NGK CR9EIX, it should fit on the V
but I am not sure if that's a good alternative for V's spark plug. Any advice?
Thanks!
 

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I had a very subtle increase in throttle snap on the BMW's when I switched to the Denso Iridium- I think I will fool with some of these suggestions when mine is due for a plug change. But given their condition at the last check, that will be 2012...
 

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Make sure you use anti-seize on the threads. I've read horror stories of plated plugs welding themselves in their holes if left a long time.:eek: Although these were in automobiles.
 

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