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Fully rebuilt 400ex bored to 416, 10:1 compression piston, stage 2 hotcam, full white brothers exhaust, 165 main and 42 pilot jets. Bogs and cuts out at wot. Too much fuel or not enough?
 

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Not enough. 165 wont be near enough. I would bet its also getting extremely hot also. This is a keihin jet right? Not a dynojet? Welcome to the forums!
 
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