White Bros CDI Box on 400EX??
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#3
Well, heres how it works at least for me. I manages to get a white bros cdi real cheap from a guy at work (he found out whats happens to a 400ex when it rolls off a trailer at 75 mph). If your bike is otherwise stock, its a waste because the powerband takes a dive before it ever gets to the stock redline, i.e., its faster if you shift before you get there. I dont know the story with a aftermarket pipe only, because i installed a new cam shaft at the same time i piped mine. I installed a white bros race cam and stiffer valve spings, which did hurt the bottom end somewhat, but the rev limiter became extremly helpful because the motor now pulled like mad all the way the up, the rev limiter increase allows me to pull a gear farther about 1200rpm worth i think
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