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cmore

grey wire ??

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I'm new to the site, & fourstrokes, always been two stroke. yz125 finally rode the wheel off. took big step up & always looking for improvements. what is this grey wire.?

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Grey wire found ONLY on U.S. WR's.

Grey wire is input to ignition and cuts out spark or retards timing or something. Proved on a dyno (I think WR250 though) the results were nothing short of drastic.

>> REMOVE The grey wire.

Blue Wire is ignition input to lower rev limit/reduce spark in neutral. Guys have claimed removing it allows better spark for starting.

>> I HAVE done both to my 99 WR420 Bigbore

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