hi fellow riders , i just bought a 1999 kawasaki 1500 nomad the p.o. had put a k&n air filter, and cobra pipes on it and removed the baffles, he did not rejet the carburator , i removed the carb to riching up the air fule mixture screw and it was 6 turns out, i put it to 31/2 my question is do i need to rejet and will i notice a power increase if i do? , and should i turn the mixture screw anymore either way?  thanks  ,wolf  

So How did it work out? I have a 99 1500 Vulcan...put Straight Shots on it...the damn thing acts like it is starved for fuel when starting cold. Like the choke isn't quite getting there. I guess what I am looking for is for someone to say...Oh yea..you gotta re-jet that. I don't want to screw it up. Once I get it running and warm it goes just right.
Do you know of a site...or a book... that actually explains re-jetting a Vulcan? like I said, I don't want to screw it up...but I want to do it myself.  

i would think a rejetting is called for. what do your spark plugs look like? that's a good indicator. plus i wouldn't recommend running with some sort of baffles for the back pressure.  

Try this, and start at the beginning, since each of the smaller jets are still running as you go up.
http://www.motorcyclecruiser.com/tech/motorcycle_jet_kits_carburetion/index.html

Once you get the bottom sorted out, then, decide if you want a larger main.
I did the re-jetting after getting a K&N/ Thunder air, but, because I didn't replace the exhaust at the same time as the intake, I probably could have gone with a smaller main jet(but still larger than stock).