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2006 YZ250F Jetting

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Hi All,

I posted this to the jetting forum but it's not really a jetting issue just aq question. I read the Motorcycle USA ride report on the new 2006 YZ250F. In the article they state that Yamaha has changed the needle and is using a 177 Main Jet instead of prior years 182. I have an 04 250F and am using JD's jetting kit and I'm using the red needle and a 188 main (if I remember correctly). My bike runs fine; bottom to top. Would anyone have an idea as to why they went leaner on the main? Could it be the new exhaust. I'm of the understanding the engine basically remains unchanged. Any thoughts? I plan on getting a new 06 in the next few weeks.

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If I recall mine came with a 182, your absolutely right based on my experience with the JD kit; swappping between the red and blue needle using the same clip location makes a big difference.

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