been there myself. the best and most thorough how-to clean a FCR carb was done by Ty Davis and Dirt Rider Magazine. here's a link:
http://www.dirtrider.com/tech/141_0707_ ... ewall.html
if the jets are clogged it's very difficult to clean them sufficiently not to be an issue. also, do not use carb cleaner on any part that has a rubber seal. this includes throat/slide as the slide has a floating valve seal that is easily damaged by carb cleaner. if you remove the slide make sure you get the floating valve plate on in the correct orientation.
also, check the accelerator pump diaphragm as it is often deteriorated if it's older and/or been sitting in fuel for an extended period of time.
lastly, many of the screw heads are made of butter...so use the correct sized driver and make sure you have a good bite. don't attempt to unscrew a Philips head screw at an angle.
good luck!
ken