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Looking at the cross reference chart, I see Autolite makes a Xtreme Sport Iridium plug PLug # XS4302 10mm thread 3/4" reach.
Replaces NGK CR9EB and CR10EK or should I just go with the CR10EK. Heard that the CR10's don't do to well in very cold temp start ups. I will see and have been riding in -20. And after spending an hour getting the damn things out, I don't want to do that in -20 weather!
I have 6k miles on my 10eks. I've been out in -15f a few times. I never had a problem with the plugs. When it's that cold, I let the sled warm up for 5 or 10 minutes while i get dressed. I've had more problems with fuel pump relays at those temps. As far as performance difference I can't say, because I put them in when the sled was brand new. I put a set in my 04rxwarrior with an ecp kit and never had a problem in 5000 miles. I think people who have plug problems tend to start their sleds for a couple of minutes in their garage just to hear it and don't let it fully warm up.
Just my 2 cents
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