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spyr_409

09 yz450 with a yosh rs2 full system Jetting specs?

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I had that on my bike and I just went up one on the pilot jet, I believe it was from a 42 to a 45 and fine tune with your fuel screw. Outside of that I just changed the main jet according to the season, up one for winter and back down to stock for the rest of the year. Great pipe for that bike.

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