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difference in jet needles?

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What is the difference between these two needles:(6CHY6-81/6CHY5-81).

Obviously one is smaller than the other but which?

The bike is a 2004 YZ125 and the stock needle Is the 6CHY6-81 but the 6CHY5-81 looks larger,and fits inside the main shallower. I havent measured them with a micrometer yet as one needle is in the bike still.

thanks, snipe

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