Spark plug - to irridium or to not. - Honda Motorcycles - FireBlades.org
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post #1 of 7 Old 05-03-2005, 2:29 AM Thread Starter
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Spark plug - to irridium or to not.

Hey all. Whats the exp with a steel plug in the 929 vs the OEM irridium plug ? . Anyone used the steel units ? . The irridiums are great for high static comp and forced induction where the spark ign circuit remains the same, the effect of "snuffing" out the park is less, but on stock engine, with steel plugs, anyone have any negative results ? . For the most part a steel/copper plug will make more power at the expence of durability (that im not worried over)

For ref , the plugs are as follows

CR9EHIX-9 - iridium

CR9EH-9 - steel
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post #2 of 7 Old 05-03-2005, 4:34 AM
 
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Re: Spark plug - to irridium or to not.

Go the iridium....they are worth the extra expense.

Poking the Devil with a stick then running away
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post #3 of 7 Old 05-03-2005, 9:29 AM
 
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Re: Spark plug - to irridium or to not.

I use the expensive oem ones, but I have been told to use the steel plugs you wont notice a diffrence
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post #4 of 7 Old 05-03-2005, 9:35 AM Thread Starter
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Re: Spark plug - to irridium or to not.

Well that seems to be the feeling. Ive tried mega dollar irridiums in hi-po cars, and never really noticed a difference on bikes when running a steel plug, hence the reason i asked specifically on the 929. The irridiums are in ok cond, but while i have the top end of the head off, i wanted to do a set now and save me some hassle for a tad later.
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post #5 of 7 Old 05-03-2005, 11:05 AM
 
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Re: Spark plug - to irridium or to not.

You can get the iridiums pretty cheap. This info is a bit old, but it should still work.

A place that sells to individuals:
http://www.monarchproductsinc.com/ngk.htm

NGK Part Number: CR9EHIX-9
NGK Stock Number: 6216

They sell the Iridiums for $6 bucks a piece. Flat shipping charge of $5 per order, too. I recently ordered from them, and received my order in 3 days via UPS ground.

FYI, they also told me that the Platinum plugs are being replaced by Iriduim. New and improved.

I bought plugs for myself from Monarch. The cost per plug was 6.40. With shipping it came out to about 30 bucks for 4. See above...

I installed them, it made a nice difference. I went in from the front, using the stock plug tool. It was tight, but no worse than changing the plugs on lots of car models.
Call 1-888-800-9629 and ask for Randy @ Monarch.
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post #6 of 7 Old 05-03-2005, 11:11 AM
 
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Re: Spark plug - to irridium or to not.

You probably wouldn't notice a difference between new iridiums and new steel plugs. The iridiums should have a far longer life however. The electrode tips are very tiny, which is good, they don't degrade like steel plug tips.
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post #7 of 7 Old 05-03-2005, 11:52 AM Thread Starter
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Re: Spark plug - to irridium or to not.

Quote:
Originally Posted by Zippy
A place that sells to individuals:
http://www.monarchproductsinc.com/ngk.htm

FYI, they also told me that the Platinum plugs are being replaced by Iriduim. New and improved.
Thanks for the contact. I used to race for Denso and NGK at one time in different teams, but ill keep that in mind if nothing comes thru for exotic plugs. The platinums are not as conductive as steel or irridium , making them not a power making plug. They are only good for one thing .. long mileage.

Cheers mate
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