first off we're going to get beat up for posting and answering questions in the tech section - we should be in the rubber side down forum - none the less anyone with a handle of "proangler" is a friend of mine!

well the '87s are pretty different carbs - some have a 3 slot needle so you can adjust the midrange mixture without hacking down the white spacer like we do on the later model bikes - you likely are going to need to have a look at a newly installed spark plug to decide if you need to do anything at all as you change things - a rule of thumb might be 1/2 jet size for the k&n and 1 jet on the pipe on the - i'd pick up a 157.5 and a 160 before I started messing with it and several of the cheap champion spark plugs to judge the mixture - also check out the carb101 posting in the tech section