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Old 07-19-2010, 03:01 AM   #1 (permalink)
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Default best spark plug

what is the best spark plug i can buy for my yfzr? thanks guys.
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Old 07-19-2010, 02:12 PM   #2 (permalink)
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Stock = CR8EIX
Ported with High compression = CR9EK
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Old 07-19-2010, 03:06 PM   #3 (permalink)
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thanks daddio
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Old 07-20-2010, 12:53 AM   #4 (permalink)
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just want to make sure, NGK Spark Plug - Iridium IX CR8EIX

this is it right?
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Old 07-20-2010, 01:12 AM   #5 (permalink)
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Yup, haven't ran the iridium. I have heard its a good plug, I want to try one just forget every time I go to the shop.
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Old 07-23-2010, 10:51 AM   #6 (permalink)
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The Iridium lasts a lot longer than the regular plug. I used to run them a lot, until I discovered the CR9EK for the race quads.
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Old 08-03-2010, 06:05 PM   #7 (permalink)
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daddio im glad that there are compitent people on this site that know what spark plugs do for a motor. have been saying the 9 is better for the motor when you race them. i have run the yz motors since 99 in my quad and have played with the plugs for different reasons including overheating. check out the post for overheating in the powertrain section and look at the bullshit people wrote. the 9 is a cooler plug and performs better in my experience. i ran a 10 in my yz400 motor in 99. your bike doesnt run hot eathier correct?
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Old 08-04-2010, 12:05 AM   #8 (permalink)
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The only time my quads run hot is during a long flat track session, and I've been thinking about running a 10 when I'm flat tracking.
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Old 08-04-2010, 12:16 AM   #9 (permalink)
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is the CR9EIX a good plug its the iridium equivalent i know the CR9EK is a dual eclectrode i have the CR8EIX in mine now and it doesnt seem to be getting to hot but ive had alot of motor work done so im not sure if i should run a colder plug
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Old 08-05-2010, 08:31 PM   #10 (permalink)
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The best power making plug I have tried in the YFZ is the NGK CR10EK. It is a dual electrode plug. The electrodes are cut back and not as long as the single electrode on a CR8. I noticed a definite increase in power when I put it in.
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Old 08-05-2010, 09:43 PM   #11 (permalink)
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How hard is it to change the plugs on the new yfzr? I could possibly do a dyno test with the plugs in the future when the fci intake comes out.
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Old 08-05-2010, 09:46 PM   #12 (permalink)
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No mean to hijack but what plug should i run in mine with a stroker crank, jetted, pipe and intake ?
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Old 08-06-2010, 07:36 AM   #13 (permalink)
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Quote:
Originally Posted by builtnotbought View Post
No mean to hijack but what plug should i run in mine with a stroker crank, jetted, pipe and intake ?
wrong section if your bike is carbed but cr8eix would be a good plug for you
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Old 08-10-2010, 02:17 PM   #14 (permalink)
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Quote:
Originally Posted by daddio View Post
Stock = CR8EIX
Ported with High compression = CR9EK

is this true for the yfz's too?
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Old 08-24-2010, 03:06 AM   #15 (permalink)
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I'm not an auto mechanic but i just want to contribute idea... I've heard and read about the most trusted spark plug brand...hope this one will help... :)
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