Welcome to the forum. Yes the stock throttle and everything else will fit on the 1-1/8 bars because they are only 1-1/8 at the clamps. By the time you get to the bar ends they are either stepped or tapered back down to 7/8.I plan to put Flexx bars on my 02 400ex and was wondering if the stock throttle will fit on the 1 1/8 bars. Any help is greatly appreciated.