{"product_id":"tillotson-hw33a-inlet-tension-spring","title":"(29) Tillotson HW-33A Inlet Tension Spring – Select Weight","description":"\u003cp\u003eThe \u003cstrong\u003eTillotson HW-33A inlet tension spring\u003c\/strong\u003e controls the closing force of the inlet needle in the carburetor metering system. The spring tension determines how aggressively the needle re-seats when fuel demand decreases, which directly affects fuel metering response and consistency. Available in five weight options — 26G, 31G, 37G, 42G, and 46G — allowing engine builders to fine-tune fuel delivery characteristics to match specific engine setups and track conditions.\u003c\/p\u003e\n\u003cp\u003eLighter springs (26G, 31G) allow the needle to open more easily, providing richer fuel delivery under moderate demand. Heavier springs (42G, 46G) require more diaphragm force to open the needle, resulting in leaner metering at partial throttle. The 37G spring is typically the baseline starting point for most KA100 setups. Consult your engine builder for the recommended spring weight for your specific configuration.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable Weights:\u003c\/strong\u003e 26G, 31G, 37G, 42G, 46G\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Controls inlet needle closing force \/ fuel metering response\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 spring per order\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSpring selection is an advanced tuning variable. Most racers start with 37G and adjust from there based on engine builder recommendations. Available at CMC Karting.\u003c\/p\u003e","brand":"IAME USA","offers":[{"title":"26G","offer_id":47891660374237,"sku":"TI-24-B323X","price":13.85,"currency_code":"USD","in_stock":true},{"title":"31G","offer_id":47891660407005,"sku":"TI-24-C296X","price":13.85,"currency_code":"USD","in_stock":true},{"title":"37G","offer_id":47883285954781,"sku":"TI-24-B299X","price":13.85,"currency_code":"USD","in_stock":true},{"title":"42G","offer_id":47891660439773,"sku":"TI-24-C298X","price":13.85,"currency_code":"USD","in_stock":true},{"title":"46G","offer_id":47891660472541,"sku":"TI-24-C297X","price":13.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0731\/6770\/0189\/files\/CMC_KA100_29_TILLOTTSON_CARBURETOR_HW33A.png?v=1778163609","url":"https:\/\/cmckarting.com\/products\/tillotson-hw33a-inlet-tension-spring","provider":"CMC Karting","version":"1.0","type":"link"}