Buss sitting on the dyno now need help

Bertactive

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Current mods airbox door mod, pair valve blockoff, naturally a k&n filter, new plugs & coils just incase but already installed full bricks exhaust and 08 fuel pump!

My issue is bike was acting like it had a vaccume issue so we opened it up found a couple of Mis guided lines and went back to tunning to run into an EXtreme lean issue I just replace the fuel pump because of this before anyone know what could do this maybe a bad sensor?
 
sorry cant really help ,but if its really that lean i would be looking for an air leak
BUMP for ya anyway

oh and give the guys some more info ie year / miles etc all may help /is the 02 sensor fitted
 
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