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How can my yz 250 be faster

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I just did a top end rebuild on my 95 yz 250 and wanted to know how I could get the best performance out of it. I was told that a NGK BR8EIX -iridium spark plug would give me better throttle response, is this true?

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Really about the best thing you can do is the top end and make sure your reeds are good and your jetting is good. You can replace the plug but I doubt you will notice a difference unless your old plug is badly worn. If you have the money I would re-pack the muffler and make sure the pipe has no major dents.

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