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How long?

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Hey guys, how long will the stock spark plug on my '04 YZ250F last? I've been riding with it for the past seven months since I got the bike new. Its the only plug I've ever used. Just wondering when I can expect it to go out on me. I ride about once, sometimes twice a week on trails. Thanks for any help.

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ive heard it just depends how long u ride at a time and how hard u ride!! i would change it every few months i mean its only a few bucks it aint gunna hurt nothing!!

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http://www.thumpertalk.com/forum/showthread.php?t=177135

Only one of many readings. Iridium is harder and more wear resistant. But...After I replaced my stock (CR8E) with the CR8EIX starting (electric) is quicker, and my bike doesn't bog as much when it's cold and is more responsive at operating temperature. And from what I've read, less chance of failure and fouling. Do a search for iridium plugs. You can get them for us$6.95 at sparkplugs.com.(CA) It was worth the extra couple bucks. But, so many more folks know more than me, wait for more concrete answers.

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