{"product_id":"tillotson-hw33a-high-speed-mixture-screw","title":"(30A) Tillotson HW-33A High Speed Mixture Screw","description":"\u003cp\u003eThe \u003cstrong\u003eTillotson HW-33A high speed mixture screw\u003c\/strong\u003e controls the fuel\/air mixture at wide-open throttle and high RPM on the HW-33A carburetor. This is the primary tuning screw that determines peak power output mixture — turning clockwise leans the high-speed circuit, counterclockwise richens it. Correct high-speed mixture is critical for both performance and engine safety.\u003c\/p\u003e\n\u003cp\u003eA lean high-speed setting produces more power but risks detonation and piston damage. A rich setting protects the engine but costs power. The optimal setting produces a light chocolate-brown to tan spark plug reading. Replace the screw if the needle tip is worn, bent, or damaged.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 screw\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNever bottom out mixture screws forcefully. A damaged tip prevents precise mixture control. Available at CMC Karting.\u003c\/p\u003e","brand":"IAME USA","offers":[{"title":"Default Title","offer_id":47883285987549,"sku":"TI-43-1030","price":11.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0731\/6770\/0189\/files\/CMC_KA100_30_TILLOTTSON_CARBURETOR_HW33A.png?v=1778163610","url":"https:\/\/cmckarting.com\/products\/tillotson-hw33a-high-speed-mixture-screw","provider":"CMC Karting","version":"1.0","type":"link"}