I tried the search to no avail. I am in process of cleaning carb. and doing the throttle stop mod. Carb. was really gummed up since bike had been sitting for at least a year when I bought it. The bike is '00 WR 400. I was about to take the bowl off, but don't kmow the deal with this brass colored, star shaped piece located on the bottom. Is it an adjustment, drain,etc? O-ring looks a little boogered up too. I guess what I'm asking is it worth messing with? I don't want to install the carb. just to take it back out to deal with this. Sorry for all the newbie questions, but don't have a shop manual. Is there one on-line? Thanks, Usedup.