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Discussion Starter · #1 · (Edited)
I have an 03' 400ex with a curtis sparks exhaust, 11:1 compression piston, k&n intake, 152 and 42 jets, and a shindengen cdi box.

I have been reading that its the cdi box that causes the weak spark and the hard start. Its about an inch or so shorter than the stock one. I put it on a friends bike and he had trouble starting his.

If this is the problem what cdi should I buy?
 
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