Spark Plugs
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If Irridiums have dual electrode and same displaced area as stock might be a good choice.Here is some confirmed dynoed facts though.R1bike,RX1,Apex snowmobile all with 1000 4 cyl switching to our ek plugs is 3hp.Its not known if the two electrodes raises compression just a little or why the switch does it but its been confirmed by many people on a dyno.So we have a great plug to start with.Some quads came with 10's though and those I would get out and run 8's.Never fouled a plug and never had any problems with the 8's.
Iridiums are single electrode and I have fouled one before figuring out proper ECU settings. Only difference noted here was slightly better cold starts, but that may be my imagination too. I have run many different plugs to test including Splitfires and Denso dual electrode versions. Here are some cross overs:
Stock plug: NGK CR8EK
Options:
NGK CR8EIX (Iridium)
Denso Iridium: IU24A
Denso Multi-Ground: U24ETR
Splitfire Platinum: TP430C
Splitfire Standard: SF430C
Autolite: 4303
Stock plug: NGK CR8EK
Options:
NGK CR8EIX (Iridium)
Denso Iridium: IU24A
Denso Multi-Ground: U24ETR
Splitfire Platinum: TP430C
Splitfire Standard: SF430C
Autolite: 4303
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I have in my cars, they are not Nology brand, but Silverstone... Who knows if they really make a difference...
We have had CR8EKs foul before, and typically ride in varying conditions from 10 degrees to 105 degrees year round. We plan on going into the plugs with the settings correct and dyno tested, so we will see if we ever get a foul condition again!!
We have had CR8EKs foul before, and typically ride in varying conditions from 10 degrees to 105 degrees year round. We plan on going into the plugs with the settings correct and dyno tested, so we will see if we ever get a foul condition again!!
QUOTE (thedeatons @ Apr 3 2007, 01:28 PM) <{POST_SNAPBACK}>
We have had CR8EKs foul before, and typically ride in varying conditions from 10 degrees to 105 degrees year round. We plan on going into the plugs with the settings correct and dyno tested, so we will see if we ever get a foul condition again!!
That's the key - proper fuel settings/delivery. You're only going to foul plugs if there's too much fuel or excessive oil in the combustion chamber (Ok, weak spark too!). I've never fouled a plug regardless of ambient temperature or riding conditions when the 'Dales are properly tuned.
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