Stock jets on 400ex?
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Nathan Paynter (08-18-2020)
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Mine came rich from the factory, but I didn't change it until I put the MODS on it. After warming it up ride it wide open in fourth or fifth gear for 5 or 10 minutes and shut it down as soon as you let off the throttle. Pull the plug out and look at it if it's white on top it's too lean. If it's black on top of the plug, it's too rich. If it's cardboard tan it's juuuust right.
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