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2014 yf450 only fires when primed then nothing , fuel pump?

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I just bought this bike in a not running condition I am a tech in my past life before fuel injection on race bikes, when I got the bike I pulled it down found piston had made contact with ex valves so replaced piston, valves cam chain and tensioner, got it all back together and it wont fire unless its primed through air box even tried push starting it , my first instinct is to replace fuel pump but at 330 bucks I would like to have so input from you guys thanks

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