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spring interchangeability

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i've got an 06 yz250 with the stock suspension. I'm to heavy for stock, and the stock rates for 450's are about right for my weight. Does anyone know if 06 fork/shock springs are interchangeable with the newer bikes? Between the 06 and 07 the fork springs part number differ slightly, like -m0- to -m1-. I know they changed for tube diameter so i'm wondering if the springs changed significantly?

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They frequently change spring rates from year to year as a matter of tuning, but the lengths and diameters remain the same (at least in every case I've looked into). My guess is the part number change you saw for the fork springs from 06 to 07 was a rate change to make them stiffer.

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I swapped out a the 06-09 model YZ450F stock springs with my 2012 yz250......worked perfect.   

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