best spark plug - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
 
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post #1 of 15 (permalink) Old 07-19-2010, 03:01 AM Thread Starter
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best spark plug

what is the best spark plug i can buy for my yfzr? thanks guys.

2009 YFZ450R SE- Houser -.75 a-arms w/ Cecco bracket, Fox Evol gen 2 Evols, Fox Gen 2 Podium X, CCP steering stabilizer, Pro Armor nerfs, HiPer Tech 3's, razr2's , Houser grab bar, E-sticky graphics, HMF Competition exhaust, GYTR/MSD ignition, trinity intake

2008 Raptor 250 SE- (Sold)

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post #2 of 15 (permalink) Old 07-19-2010, 02:12 PM
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Stock = CR8EIX
Ported with High compression = CR9EK

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post #3 of 15 (permalink) Old 07-19-2010, 03:06 PM Thread Starter
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thanks daddio

2009 YFZ450R SE- Houser -.75 a-arms w/ Cecco bracket, Fox Evol gen 2 Evols, Fox Gen 2 Podium X, CCP steering stabilizer, Pro Armor nerfs, HiPer Tech 3's, razr2's , Houser grab bar, E-sticky graphics, HMF Competition exhaust, GYTR/MSD ignition, trinity intake

2008 Raptor 250 SE- (Sold)

Sponsors: Houser, Gt Thunder, Pro Armor, ODI, ASV, Steel MX/SMX Optics, Stroker Industries, Oneal MX, EFX, Houser, MX vs. ATV: Reflex
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post #4 of 15 (permalink) Old 07-20-2010, 12:53 AM Thread Starter
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just want to make sure, NGK Spark Plug - Iridium IX CR8EIX

this is it right?

2009 YFZ450R SE- Houser -.75 a-arms w/ Cecco bracket, Fox Evol gen 2 Evols, Fox Gen 2 Podium X, CCP steering stabilizer, Pro Armor nerfs, HiPer Tech 3's, razr2's , Houser grab bar, E-sticky graphics, HMF Competition exhaust, GYTR/MSD ignition, trinity intake

2008 Raptor 250 SE- (Sold)

Sponsors: Houser, Gt Thunder, Pro Armor, ODI, ASV, Steel MX/SMX Optics, Stroker Industries, Oneal MX, EFX, Houser, MX vs. ATV: Reflex
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post #5 of 15 (permalink) Old 07-20-2010, 01:12 AM
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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.

"Chrome screws make you win QOTM, even without anyone seeing them."
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post #6 of 15 (permalink) Old 07-23-2010, 10:51 AM
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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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post #7 of 15 (permalink) Old 08-03-2010, 06:05 PM
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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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post #8 of 15 (permalink) Old 08-04-2010, 12:05 AM
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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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post #9 of 15 (permalink) Old 08-04-2010, 12:16 AM
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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

2006 yfz 450
35 leak, 165 main, 45 pilot12.5:1 piston
trinity exhaust with shorty,hot rods crank(i believe),ported head,oversized valves,cams,vortex ignition,K&N filter,zip tie carb mod....throttle spring mod,works triple rate front shocks
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post #10 of 15 (permalink) Old 08-05-2010, 08:31 PM
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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.




'09 YZF-R!

Faast Flexx Quad Racer Highs with Oury Grips
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Power Commander 5
Fox Float EVOL Front Shocks
Hiper Tech-3's With ITP MXR-6's All The Way Around


2008 Grizzly 700 EPS-Modified Pipe, Filter, Hotcam Stage 2, Power commander
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post #11 of 15 (permalink) Old 08-05-2010, 09:43 PM
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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.

09 yfz450r
05 yz250f
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post #12 of 15 (permalink) Old 08-05-2010, 09:46 PM
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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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post #13 of 15 (permalink) Old 08-06-2010, 07:36 AM
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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

2010 YFZ 450 R SE sold
-jsr exhaust, msd, mmad port, mmad warpspeed intake cam, 12.4:1 CP piston, fci with box, holeshot GNCC's
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post #14 of 15 (permalink) Old 08-10-2010, 02:17 PM
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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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post #15 of 15 (permalink) Old 08-24-2010, 03:06 AM
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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... :)

All about Spark Plugs
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