Rev limiter wire

I have a friend that just got a 06 WR 450 he has heard that he needs to cut the REV limiter wire (gray wire) can anyone tell me where it is

It is better to remove the wire from the plug instead of cutting it.

It is at the CDI, large plug. FYI, it is not a rev limiter wire. I enables access to a different ignition curve map, the YZ one. Take a read of the manual before you touch wires to ensure you disconnect the correct one.

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