Yes too runs like crap but after i warmed it up it seemed to run good it also 
maybe i 
had trouble with starting do to a bad cdi box and no spark fixed that maybe to 
much fuel in the motor...have to try in the morning the bike is to load to try 
now neighbors won't like me 
firing the bike up at 10pm ...lol its quiet hood
I'll check the Exhaust too..thanks james 
and yes the wire are correct i did the way the book said two checked four times 
do too the bad cdi box

--- On Sat, 6/25/11, James O'Gorman <[email protected]> wrote:


From: James O'Gorman <[email protected]>
Subject: Re: [Nighthawk Lovers] back fires when cold
To: "[email protected]" <[email protected]>
Date: Saturday, June 25, 2011, 9:43 PM



Does the bike run like crap? You may have some plug wires crossed so that a 
cylinder or two isn't firing and the unburnt fuel is traveling out the exhaust 
and igniting when it hits the hot exhaust from the other cylinders.


You could also have over- richened the mix which could cause similar issues. 
Are all four pipes heating up equally?

- James O'Gorman

On Jun 25, 2011, at 6:32 PM, Bryan McGee <[email protected]> wrote:









Ok again I need some help I've got a 84 Nighthawk cb650 I'm all done putting 
the bike back together and i cleaned the carbs just like the manual say to. 
after getting the bike to fire up it back fires out the exhaust what could be 
the problem? after getting to warm up it seems to run good what can I do.also 
i'm running supertrap exhaust 4 to 1 on it..
 
 
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