【Compatible Model】: Idle Speed Screw for FCR 33 37 38 39 40 41 Carburetor. 【Replace Part Number】: Idle Speed Adjustment Screw, 1034-815-4500, 021-745, please check the part number and make sure your part number matches this part number before buying. 【Special Functions】: Fuel Mixture Screw, Create your unique idle speed sound, get the exact idle speed you want. 【Material】: The Idle Speed Screw is made of premium material, wear resistant, sturdy and durable. 【Easy installation】: Fuel Mixture Screw, No complex tools, direct installation, plug and play, direct replacement.
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