Part No. 18-1720.BLACK
Hot Start Replacement Nut Keihin.
Mino, Hot Start Carb Nut fits on the 03-04 YZ/WR 250F/450F, as well as the CRFs, KX-Fs, RM-Zs, and KTM 'RFS' bikes, and replaces the stock plastic unit with a red/bleu/orange anodized, billet aluminum unit.The stock plastic nut can crack and self-destruct without even touching it.