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Discussion Starter #1
I have a 2002 400ex that is running lean. I will let it idle for a min or two, do a lap around the yard, and it will be pretty hot. I checked the plug and it was white. Only modification I have is fmf slip on. Everything else is stock. I am around 800ft above sea level. What jet size would I need? Price range? Thanks!
 

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Your pilot jet should be a #38, you might turn the fuel screw 1/4 to 1/2 turn out and the main jet could be bumped up to a 155 or 160
 
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