I think they all need to warm up with the choke on before you can give them any 
throttle. Backing out the pilot jet screws to 3 turns helps.
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-----Original Message-----
From: Matt Temple <[email protected]>
Sender: [email protected]
Date: Tue, 24 May 2011 19:17:30 
To: Nighthawk Motorcycle Lovers!<[email protected]>
Reply-To: [email protected]
Subject: [Nighthawk Lovers] Here's a blast from the past... on carbs for my
 '85 CB650sc

It was December, 2007, and the Nighthawk I'd bought was in the garage
and exhibited the problem I'd mentioned -- Idled with choke full on,
totally died when given any throttle.   The only group around that I
could find then was the Yahoo Nighthawk group, so I went to find my
early posting over there.   (I can't believe I've had my Nighthawk for
that long. )

The explanation given to me was:

"You're going from lean to leaner and exceeding the stoichiometric
requirements for combustion."

(In short, if the main jets are blocked when you open the throttle,
you're increasing  the amount air, without increasing the amount of
fuel ... so, no bang. -- that was from Lou Medina)

Matt

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