MAR8B-JDS are not the only spark plugs that fit the DOHC engine.

Ive been running the single electrode version of the NGK MAR8B-JDS for about 10K miles with no difference in fuel consumption and they do unscrew just fine. They might wear out a little faster, having only the one electrode, but they are considerably less money and a lot easier to get hold of.

My socket set plug spanner was too fat for the job so I bought a long plug spanner socket from a half decent tool shop and that works fine.
 
Bendy toy said:
Ive been running the single electrode version of the NGK MAR8B-JDS for about 10K miles with no difference in fuel consumption and they do unscrew just fine. They might wear out a little faster, having only the one electrode, but they are considerably less money and a lot easier to get hold of.

My socket set plug spanner was too fat for the job so I bought a long plug spanner socket from a half decent tool shop and that works fine.
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Have you got the part no Bendy ?
 
The Denso that matches the MAR8B JDS with temp range etc is in fact the IU24. I have been running these for nearly a year and they are as you would expect from a good iridium plug. Just got back from 3000 mile trip to Spain with hard road and off road riding through the national parks and bike was faultless. Hope this helps.
 
Delboy777 said:
So.................has anyone gone down this route and tried the Denso IU27 plugs ?
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Before I chopped in both my '09 Hexhead and '10 Camhead for an LC, I was running IU27D plugs in the Camhead.
These are a very slightly modified version of the standard IU27 and are specific to late-model Suzuki Hayabusas. (I was lucky to get a set of four at very low mileage - the previous owner was building a drag bike and replaced the Densos with NGK racing plugs.)
I noticed somewhat easier starting and slightly improved throttle response. There was also no plug fouling despite the Densos running one heat-range colder than normal - regular inspection showed almost no deposits on the plug tips.

Smallsy said:
The Denso that matches the MAR8B JDS with temp range etc is in fact the IU24.
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Correct. Denso 24 is the direct equivalent of NGK 8.
I used 27s (equivalent to NGK 9) because I often run at very high speeds with wide-open throttle, and the quality of RSA fuel tends to be variable. The colder plugs make a small contribution to fighting detonation (pinging) under those conditions.
 
Nick V said:
You forget, you're telling this to a South African. ;)
With erections coming up this year, the latest catch-phrase is: "You can't fix stupid. But you can vote him out of office."
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Errrrr.......... Nick you might want to look a little closer at the spelling in this post. I am a pedant about spelling, but this really does need correcting.
 
Bendy toy said:
The plugs I have are NGK single electrode a lot less cost than the double electrode type
NGK R - DCPR8E-N
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Totally irrelevant to this thread as those plugs won't fit a DOHC (TC) engine. They're fine in your 08 GSA I guess, since they have a 12mm thread diameter, but not as a replacement for MAR8B-JDS as these have a 10mm thread diameter.
 
Sorry my mistake but chances are the single electrode version will work just as well as it does in the Mk2.
 
SteveM said:
Errrrr.......... Nick you might want to look a little closer at the spelling in this post. I am a pedant about spelling, but this really does need correcting.
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Not really... if you take a look at Jacob Zuma's history over the past fifteen years or so, you'll see that not only is he himself an erection (which makes sense, considering he's able to successfully misrepresent himself by walking upright on two legs), but many of his off-duty gaffes involve his one-eyed trouser snake.
It's also well-known that the prospect of even more power and money gets South African politicians' little weenies hard. Explains their post-e(r)ection behaviour well - after all, a stiff prick has no conscience. :green gri

DGB said:
Totally irrelevant to this thread as those plugs won't fit a DOHC (TC) engine. They're fine in your 08 GSA I guess, since they have a 12mm thread diameter, but not as a replacement for MAR8B-JDS as these have a 10mm thread diameter.
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Have a squizz:
http://www.ukgser.com/technical/nic...lug Listing (All BMW models, '99 on) V1.2.pdf :)
 
Delboy777 said:
Very informative :thumb So Denso IRIDIUM IU24s it is for me.
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I'm jealous - there is no RSA retailer that stocks Denso plugs. We only ever see them as OEM components.
99% of the time, it's either NGK or nothing - especially for specialized applications (read: Any plug-thread diameter less than 12mm).
 
I quoted the NGK number for the single cam single electrode plug. It was a lot less cost than the twin spark type.
There must be an NGK single electrode plug equivalent to the type specced for the twin cam engine.
 
Bendy toy said:
I quoted the NGK number for the single cam single electrode plug. It was a lot less cost than the twin spark type.
There must be an NGK single electrode plug equivalent to the type specced for the twin cam engine.
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There is indeed:
OHV engines ('04-'09): NGK DCPR8E (commonly available from automotive parts stores. It is also the standard plug in 798 cm3 F-series engines.)
The direct Iridium equivalent is DCPR8EIX.

DOHC engines ('10-'13): NGK CR8E
The direct Iridium equivalent is CR8EIX.
In fact, the twin-cam engine offers another interesting possibility. If you want a standard twin-electrode plug without having to shell out for MAR8B-JDS, you can use CR8EK.

The only reason twin-earth electrode plugs are specified is to get extended plug life without having to use exotic metals in constructing the plug.
 
Nick V said:
The only reason twin-earth electrode plugs are specified is to get extended plug life without having to use exotic metals in constructing the plug.
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The snag with that in UK and our nicely salted roads is the main plugs will be fine but the secondaries being open to the weather could get seized into the cylinder heads. They should be taken out from time to time to be sure the threads are not seizing. I personally favour using some anti seize paste on the threads closest to the sealing washer. Too much could affect the tightening torque, but a seized spark plug is very not fun. (Cue some comments of disgust at that idea.)

My Yamaha Diversion 900 used NGK DPR8EA-9. It had a wasted spark ignition system and the plugs would be misfiring at around 10K miles. Often the electrodes looked fine, but the plug bodies rusted so more than a year in place (10K at my usage rate) was asking for trouble. The outer plugs especially left-hand could be a struggle to remove.
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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