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00' WR400F Throttle Stop?

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I've been reading that WR models come with throttle stops that restrict power to half-throttle. Is this true? If so is there a way to replace the old stop with the YZ throttle setup to get full-throttle travel? Also, will I need to do any jetting changes to compensate for the difference in throttle settings? I have a 00' WR400F with a FMF "Q" Muffler and a TwinAir filter. Soon to be adding a Power Now system. Thanks

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