{"product_id":"def-dual-carburetor-rebuild-kit-for-mikuni-super-bn-twin-carbs-fits-sea-doo-38-46mm-complete-gaskets-jets","title":"DEF Dual Carburetor Rebuild Kit for Mikuni Super BN Twin Carbs — Fits Sea-Doo 38–46mm, Complete Gaskets \u0026 Jets","description":"\u003cstrong\u003eComplete dual-carb rebuild kit compatible with Mikuni Super BN twin carburetors for many Sea-Doo, Waverunner and similar personal watercraft models.\u003c\/strong\u003e\n\n\u003cp\u003eThis DEF dual carburetor rebuild kit supplies the gaskets, O-rings, diaphragms, jets and hardware needed to refresh two Mikuni SBN-style carbs so they perform reliably after years of use. It’s assembled as a full rebuild package for both carburetors and engineered to match OEM Mikuni dimensions, making it a practical choice when restoring fuel delivery, eliminating leaks and returning throttle response to factory-like condition.\u003c\/p\u003e\n\n\u003ch3\u003eWhich watercraft and carb sizes does this kit fit?\u003c\/h3\u003e\n\u003cp\u003eThe kit was designed for Mikuni Super BN series carburetors commonly used across many Sea-Doo, Kawasaki Waverunner and similar models. It covers common bore diameters that the SBN family uses, so it works for a wide selection of model years and engine configurations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCovers Mikuni Super BN twin carbs in popular sizes (38–46 mm ranges).\u003c\/li\u003e\n  \u003cli\u003eCompatible with numerous Sea-Doo model years from early 1990s through 2000s.\u003c\/li\u003e\n  \u003cli\u003eAlso suitable for many Kawasaki Waverunner and select Polaris models that use SBN carbs.\u003c\/li\u003e\n  \u003cli\u003eIncludes parts for a full rebuild of two carburetors—complete set except needle\/seat.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat parts are included and what’s not in the box?\u003c\/h3\u003e\n\u003cp\u003eThis kit contains the essential consumables and sealed components needed during a full overhaul of two SBN-style Mikuni carbs. It replaces worn rubber and gasket items as well as jets and diaphragm plates so you can reassemble clean, sealed carb bodies with correct internal tolerances.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGaskets, O-rings, diaphragms and seals sized for SBN twin carbs.\u003c\/li\u003e\n  \u003cli\u003eMain and pilot jets, springs, clips, screws and small hardware for two carbs.\u003c\/li\u003e\n  \u003cli\u003eFloat chamber gaskets and other rebuild items—needle and seat are not included.\u003c\/li\u003e\n  \u003cli\u003eTwo complete kit sets—one for each carburetor—so both sides are matched.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow will installing this kit affect performance and reliability?\u003c\/h3\u003e\n\u003cp\u003eRebuilding worn carbs restores airtight sealing and correct fuel metering, which reduces stalling, hesitation and poor idling without needing a full carb replacement. Properly installed rebuild kits typically improve throttle response and stability across rev ranges by eliminating vacuum leaks and worn diaphragm action.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEliminates common vacuum and fuel seepage points with fresh gaskets and O-rings.\u003c\/li\u003e\n  \u003cli\u003eRestores metering accuracy by replacing jets and diaphragm components.\u003c\/li\u003e\n  \u003cli\u003eMakes tuning and syncing across the twin carbs more consistent.\u003c\/li\u003e\n  \u003cli\u003eExtends usable life of OEM carb bodies, avoiding costly replacements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know before I start the rebuild?\u003c\/h3\u003e\n\u003cp\u003eCarb rebuilding requires some mechanical experience, basic tools and a clean workspace to avoid introducing debris into fuel passages. Inspect floats, float needles and seats, and confirm jet sizes before final tuning; you may need to source needle\/seat components separately if they are worn or leaking.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse carb cleaner and compressed air to clear passages before assembly.\u003c\/li\u003e\n  \u003cli\u003eVerify float height and bench-test for leaks before reinstalling on the engine.\u003c\/li\u003e\n  \u003cli\u003eKeep jets and small parts organized to ensure correct placement during reassembly.\u003c\/li\u003e\n  \u003cli\u003eNeedle and seat replacement may be required but are not included in this kit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The DEF dual rebuild kit is aimed at DIY mechanics, marine technicians and restoration enthusiasts who own Sea-Doo, Waverunner or similar PWC models that use Mikuni Super BN twin carburetors. If you need to renew both carbs with OEM-spec gaskets, diaphragms and jets without replacing the carb bodies, this kit provides the matched parts needed to complete a professional-quality rebuild.\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: Does this kit include needles and seats?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No, needle and seat assemblies are not included; they should be inspected and purchased separately if worn.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this kit fit my Sea-Doo from the 1990s?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—this kit covers many Sea-Doo models from the 1990s and early 2000s that use Mikuni Super BN twin carbs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"DEF","offers":[{"title":"Default Title","offer_id":48085370732702,"sku":"B08GHT2XY2","price":34.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/def-front-packaging-dual-carb-kit.jpg?v=1785870350","url":"https:\/\/northtrailauto.ca\/products\/def-dual-carburetor-rebuild-kit-for-mikuni-super-bn-twin-carbs-fits-sea-doo-38-46mm-complete-gaskets-jets","provider":"North Trail Auto","version":"1.0","type":"link"}