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yzf400 jetting suggestions?

By gasketman,
in YZ400F/426F/450F/450FX

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gasketman

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What jetting combination would you guys suggest for this bike. I just got it and it is a bear to start. It also has a tendency to pop or backfire every now and then. I am running a White Bros full system which may be part of the problem. Any help is appreciated.

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