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I have a 2011 GSXR 1000. It was an old drag bike and has a port and polish head. This bike has done this since I got it. I just replaced the fuel pump, regulator, and fuel filter and it runs great now, yet this 5k start-up still happens for about 5 seconds then it lobes real hard like a cammed-out car around 1500/2000rpm. I give it gas and she goes. The butterflies have been removed from the top of the throttle body. I do not believe this is the issue but maybe? It also had the O2 sensor bypassed. Like I said it was a drag bike with everything removed that didn't have to be on there.

any help would be appreciated, thanks
 

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So what is the issue? It revs to 5k on start up but settles down or the (I'm guessing) rough idle?
 
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