This is the CV 40mm stock carb? What is the problem? Do you want to tune the carb to the exhaust.. this is a common thing to do when owners change the pipes.
The first thing to do on this carb is to be sure there are no air leaks at the intake and you can check the slider by lifting it gently and then letting it go. It should "drop" with some resistance, it it does it is probable OK. Don't take the top off the carb.
Next is the idle jet.. what is in your carb? #42? They make a 44(after market) or 45 and 48, This will make the carb "fatter" at idle only. Next is the main jet.. going up in the numbers makes it run richer.. bigger pipes usually need a little more fuel. I recently bought jets and they were about $7.00 a piece from my local Indy..
Do small changes at a time.. learn to read your plugs.. a rich engine is OK.. a lean engine is BAD.. get the timing spot on and get an ext set or two of cheap plugs and dial the bike in.. always put the filter back on when dialing it in.. here is a great site for further reading..
http://www.harley-performance.com/harley-davidson-carburetor.html
Jim
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