I have the beautiful old '01 American Classic Edition. Pretty stock...still has plugs over idle mixture screws on carbs....It doesn't get ridden much and I admit I get lazy and don't maintain it as well as I should...she always seems to start and run...was getting a little more difficult to start recently. Went to start it yesterday and it took a bit of cranking for it to fire. I put in some fresh gas. Finally, got it started with the choke pulled all the way out...it would only idle on the fuel enrichment circuit and died instantly if I opened the throttle or closed the choke. I figured the pilot jets were clogged...sure enough, after taking the carb off and pulling them, they were clogged...I was unfamiliar with these street carbs with the vacuum chamber and was in a hurry...so I replaced the jets, gambled and put it back together without inspecting anything else. Sure enough...the bike starts and idles well with the new pilot jets but will die if I give it much more than 1/8 throttle... What's with these carbs? there's some kind of vacuum chamber and bellows that moves the slide and needle? The slides did look gummed up a bit.