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Old February 11th, 2010, 03:42 PM   #16
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There are also some newer plugs out there called surface gap plugs....RACING PLUGS ONLY. 709/G54 Champions. I have a pair if anyone wants to try them. $30.00

Thanks
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Old February 11th, 2010, 03:53 PM   #17
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Here is a picture of the surface gap plugs.....RACE ONLY
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Old February 11th, 2010, 04:24 PM   #18
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Quote:
Originally Posted by SQUID-BOY View Post
I'd really like to see NGK come out with an iridium plug for us. They last considerably longer, and the "fine-wire" electrode is real hard to foul.
You don't have to wait for the NGK iridiums. Denso Iridiums have been on my bikes and cars for over ten years now, and they've been my first choice, even though they retail for several dollars more apiece than the NGKs. I once pulled them out of my V6 Nissan at 85,000 kms thinking I had to replace them. All were unworn, and within spec.

I've had the IU27 Denso Iridiums in my 1098 for half a year now and they have made a difference in start-up and everyday performance that you can feel, compared to the stock plugs.
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Old February 11th, 2010, 06:38 PM   #19
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I've had the IU27 Denso Iridiums in my 1098 for half a year now and they have made a difference in start-up and everyday performance that you can feel, compared to the stock plugs.
Thanks. I'll be due to check my valves shortly. Be a good time ...
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Old February 11th, 2010, 07:19 PM   #20
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The NGKs have never given any trouble in 40,000 kms on mine. I didn't change my plugs at the 36,000 km service (have a set on the bench to go in..) - the plugs in there have therefore done over 16,000 kms and start and run perfectly still.
I have not yet tried Iridium plugs in it, though have heard their benefits espoused, and our local Ducati shop recommends them for all 8-valves. At their price, I thought the NGKs used an exotic metal (like platinum?) - they certainly last well.
I have noticed a more instantaneous start when I've put 100 octane fuel in it.
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Old February 11th, 2010, 07:24 PM   #21
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I'm sticking with the NGK. I've used their plugs for many years on many different bikes. This one is a special configuration for a specific bike (Ducati) and isn't listed for anything else. It exists one heat range colder as an MAR9A-J, and that's for a BMW HP2 Sport, which is also a 4 valve bike.
I suspect the BMW runs a 'colder' plug as they are still air/oil cooled, and therefore more in danger of developing 'hot spots' in the combustion chamber and exhaust port?

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Old February 11th, 2010, 08:33 PM   #22
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Anyone indexing these plugs...?
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Old February 11th, 2010, 09:13 PM   #23
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I'm sticking with the NGK. I've used their plugs for many years on many different bikes. This one is a special configuration for a specific bike (Ducati) and isn't listed for anything else. It exists one heat range colder as an MAR9A-J, and that's for a BMW HP2 Sport, which is also a 4 valve bike.
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I suspect the BMW runs a 'colder' plug as they are still air/oil cooled, and therefore more in danger of developing 'hot spots' in the combustion chamber and exhaust port?
You both got it on backwards. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type.

http://www.ngksparkplugs.com/tech_su...2.asp?mode=nml
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Old February 12th, 2010, 08:41 AM   #24
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You both got it on backwards. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type.
Right you are! I knew that, must have been thinking Champion or had a brain fart, one of the two.
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Old February 17th, 2010, 10:55 AM   #25
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In case anyone is interested in using something other than the NGK plugs, I just installed the Denso Iridium IU27 plugs and they work great. I did need to purchase a spark plug socket because it is a different size plug. I got a set of three (husky) from home depot, part #379 438. Unless you already have a thin wall 5/8th or 16mm socket.
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Old February 17th, 2010, 04:42 PM   #26
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There are also some newer plugs out there called surface gap plugs....RACING PLUGS ONLY. 709/G54 Champions. I have a pair if anyone wants to try them. $30.00

Thanks
Not sure about these being newer - I seem to remember fitting some as standard to a Suzuki Rotary in the '70s.

As to the hotter/colder plugs discussion - of course you are right Hawkeye - in NGK the lower number indicates a hotter plug. I just followed the comment re "colder plug" from previous post. Should have checked...
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Old February 17th, 2010, 05:03 PM   #27
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Surface gap plugs have been around for many years. I'm thinking some of the Kaw triples also used them. They have no heat range rating.
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Old March 15th, 2010, 02:21 PM   #28
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THE DENSO IVE NOTICED is one heat range hotter then the ngk

Also ngk has a iridium that is within exact spec of the denso iridium its a ngk - cr9eix
stock number (3521)

so the regular mar10a-j's are colder , more liable to fowl out and arent irdium.

i looked up threads and everything on the cr9eix's and evrything matches the deno iu27
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Old March 15th, 2010, 02:49 PM   #29
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after riding with the denso iridium IU27 for over 500 miles, I have to say they even improved gas mileage. not much, maybe about three miles per gallon.
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Old March 15th, 2010, 05:35 PM   #30
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So where can I buy the IU27 Denso Iridiums ?? Do you all recommend these over the NGK's? My bike is getting harder to start - but living in the Mid-West - the weather is so freagin fickle and it's either hot, cold, freezing or burning up! Always a surprise when you walk outside in Mid America!
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