EXTENDED FUEL MIX. SCREW CLOSED COURSE RACING ONLY KTM EXC 400 00-02 EXC 520 00-02 EXC-G 250 RACING 02 MXC 400 01-02 MXC 520 01-02 RALLYE 660 01-05 SX 400 00-02 SX 520 00-02 SXS 540 01-02 SUZUKI DRZ400E 00-03 DRZ400E NON CA MODELS PUMPER CARB 04-07 DRZ400K 00-03 YAMAHA WR400F 98-99 YZ400F 98-99