Likely it is the carbs, loading up.  Like, a needle seat maybe?  If not, a 
vacuum leak of some sort.  The fuel shutoff valve?
 
 




________________________________
From: Kyle Munz <[email protected]>
To: [email protected]
Sent: Tue, July 5, 2011 1:13:54 PM
Subject: Re: [Nighthawk Lovers] Engine surge


I know on a car this is usually caused by a leaky intake gasket allowing 
unmetered air into the engine thus throwing the ECU's PID for a loop. I know 
these bikes are unmanaged but it may be something similar.

-Kyle
On Jul 5, 2011 12:58 PM, "Kim Paddock" <[email protected]> wrote:
> Hi all! I have a surge in my engine that I can't figure out. When I start the 
>bike it revs up and down about 500rpm. I have taken off the carbs and I don't 
>think that's the problem. Could it be the choke cable? An engine problem? Let 
>me 
>know your thoughts. Hotrodmamma.
> 
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