{"product_id":"nachuan-mercruiser-marine-carburetor-2-barrel-3-75-2-in-base-electric-choke-jets-preinstalled","title":"NACHUAN Mercruiser Marine Carburetor — 2‑Barrel, 3.75×2 in Base, Electric Choke, Jets Preinstalled","description":"\u003cp\u003e\u003cstrong\u003eThe NACHUAN 2-barrel marine carburetor is a direct-replacement Mercruiser-style carb designed to fit many 2.5L–5.7L 2-barrel engines with an electric choke and a 3.75 x 2 inch base bolt pattern.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket carburetor is sold new (not remanufactured) and arrives ready to install with #70.9 jets pre-installed, a short linkage fitted, and a side fuel inlet. It replaces part numbers 3310-864940A01, 3310864940A01 and 8M0045397 and is intended for Mercruiser Stern Drive and Mercury Marine installations. Before purchasing, compare your existing carburetor to the provided photos to confirm dimensions and bolt pattern, since this unit is not compatible with 3.25\" bases.\u003c\/p\u003e\n\n\u003ch3\u003eWill this carburetor physically fit my Mercruiser engine?\u003c\/h3\u003e\n\u003cp\u003eCompatibility depends on bolt pattern, mounting geometry and fuel\/air connections. This NACHUAN unit uses a base bolt pattern of 3.75 x 2 inches, so it will not fit carbs with a 3.25-inch pattern. It is commonly used on 2.5L and 3.0L 4-cylinder Mercarb applications and can also be adapted to some 4.3L, 5.0L and 5.7L 2-barrel setups with professional tuning.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck base bolt pattern: 3.75 x 2 in required.\u003c\/li\u003e\n  \u003cli\u003eCompare mounting flange and linkages with product photos.\u003c\/li\u003e\n  \u003cli\u003eConfirm fuel inlet position (side inlet) and electric choke compatibility.\u003c\/li\u003e\n  \u003cli\u003eProfessional tuning advised for optimal performance on larger engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the box and what is pre-installed?\u003c\/h3\u003e\n\u003cp\u003eThe carburetor ships as a complete unit ready to mount, with jets installed and a short linkage attached. The package includes a set of extra jets shown in product images for tuning purposes and a longer linkage provided but not installed. No printed installation manual is included.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e#70.9 jets are installed at the factory.\u003c\/li\u003e\n  \u003cli\u003eExtra jets included for custom tuning needs.\u003c\/li\u003e\n  \u003cli\u003eShort linkage installed; long linkage supplied in box (not fitted).\u003c\/li\u003e\n  \u003cli\u003eUnit is brand-new, not remanufactured, and packaged for immediate installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDo I need any special tools or instructions to install it?\u003c\/h3\u003e\n\u003cp\u003eBasic hand tools and familiarity with marine carburetor mounting are usually sufficient, but installation details vary by engine model. The product does not include step-by-step instructions, so watching model-specific online tutorials or consulting a mechanic is recommended. Proper tuning and choke hookup are important to ensure reliable operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHave basic wrenches, screwdrivers, and gaskets ready.\u003c\/li\u003e\n  \u003cli\u003eFollow fuel line safety and electrical choke wiring best practices.\u003c\/li\u003e\n  \u003cli\u003eSeek professional tuning for optimal jetting and idle adjustments.\u003c\/li\u003e\n  \u003cli\u003eContact the seller with fitment questions before purchase if uncertain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this unit compare to OEM replacement parts?\u003c\/h3\u003e\n\u003cp\u003eThis aftermarket carb matches common Mercruiser part numbers and mirrors OEM mounting and fuel connections, but final performance depends on correct jetting and setup for your engine. It offers a cost-effective alternative to dealer parts while providing compatibility with many Mercarb 2-barrel systems. Keep in mind that adjustments might be necessary to reach the same driveability as an OEM-calibrated carb.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplaces 3310-864940A01, 3310864940A01, 8M0045397.\u003c\/li\u003e\n  \u003cli\u003eElectric choke included, side fuel inlet layout preserved.\u003c\/li\u003e\n  \u003cli\u003ePre-installed jetting may need tuning for altitude or engine variations.\u003c\/li\u003e\n  \u003cli\u003eNew, not remanufactured — fresh components throughout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: boat owners, marine mechanics and DIY restorers who need a ready-to-install replacement carburetor for Mercruiser-style 2-barrel engines. It’s best suited to people who can confirm bolt pattern and mounting compatibility from photos, are comfortable with basic carburetor installation, or have access to professional tuning. If you need precise OEM calibration or mounting for a 3.25\" base pattern, consider verifying fitment carefully before purchasing.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this carburetor compatible with my 3.0 Mercruiser?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes if your carb uses a 3.75 x 2 inch base bolt pattern and electric choke; compare photos to confirm fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are installation instructions included?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No printed instructions; seek model-specific online videos or professional mechanic help for installation and tuning.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NACHUAN","offers":[{"title":"Default Title","offer_id":48081387749534,"sku":"B0FCYBWD9N","price":162.5,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/nachuan-carburetor-front-view.jpg?v=1785802407","url":"https:\/\/northtrailauto.ca\/products\/nachuan-mercruiser-marine-carburetor-2-barrel-3-75-2-in-base-electric-choke-jets-preinstalled","provider":"North Trail Auto","version":"1.0","type":"link"}