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2000 Wr400 cam mod question

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I have the opportunity to grab some parts off a 03 yz450 and think I want to do the cam mod. Should I do both the intake and exhaust, or is the exhaust the only one that will make a difference? Any other suggestions or advice in this direction would help.

Also I've been looking for the grey wire in the 6 wire connectors on the right side under tank. My bike doesn't seem to have a grey wire in the CDI wire circuit. The wiring diagram agrees. Does anyone know what color wire would give me the yz timing by disconnecting? I'm guessing it's just the year model that had different wiring color scheme?

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