Mikuni bn 44 MK-BN38/44, BN38. Mikuni_MK-BN38-44-SPR_Rebuild_Kit_Diagram. Features improved airflow and higher-capacity fuel pump for more demanding applications. Uses stock jetting. Two holes is the good 44 and one hole is scrap metal. Kawasaki JS550 Piston Port 44mm Mikuni SBN Complete Carb Setup Are you tired of chasing your tail trying to get your round body (BN) Mikuni carburetor running right? Mikuni High Performance Super BN Carburetors are specifically engineered for high horsepower racing watercraft. pop-off. Comes Complete with Extended Throttle Shaft and Choke Shaft Removed. I sent the wrong link, I've attached the tuning guide. Rebuild Kit for Mikuni Super BN 38 and 44mm Carburetors with Pulse Fuel Pumps used in many personal watercraft applications. This carb is quite different from a SBN. Low Speed Adjuster: 1. Needle valve and seat sold separately. Aug 2, 2005 · Re: Mikuni 44mm "Round Body" Tuning - HELP prillernut Thanks for the info, I am rebuilding the same carb on a friend's 90 550 this weekend and this will come in very handy. with that said my carb is tuned at. Sold Each. Mikuni High Performance Super BN 44mm Carburetor. Here's what it has. Your official source for genuine Mikuni parts, kits & gear. Find many great new & used options and get the best deals for Mikuni - MK-BN38/44 SPR - Super BN Rebuild Kit at the best online prices at eBay! Free shipping for many products! Re: Mikuni BN 44 - Pilot Screw Adjustment ? My old settings were fairly close to stock. Genuine Mikuni complete carb rebuild kit for SBN (Super-BN - square body) carburetors. 2. May 19, 2013 · Re: Mikuni SBN & BN Spring and Popoff Chart I have it thank you, Trying to get this to be a sticky because SOOOOOOO many people ask. of rope between the ski and the tree, set about 35 lbs on the tray to keep the pump submerged. 5 Ch Mar 16, 2010 · Buy Mikuni 44mm Racing Carburetor BN 44-40-8067: Carburetors - Amazon. Tuning the Mikuni. You also need a larger intake manifold for it. MK-BN38/44 SPR 1, BN38/547, 16-72001, BN34/97 Jan 29, 2002 · I'm building an 88 JS550 piston port motor, but I'm a little uneasy with how to do the intitial carb set-up. H. Can be Explore a wide range of our Mikuni 44mm Carb selection. Mikuni High Performance Super BN Carburetors are specifically engineered for high horsepower racing watercraft. Genuine Mikuni Carburetor Rebuild Kits contain an assortment of critical parts which may include gaskets, diaphragms, seals, hardware and more. Shop now for fast shipping and easy returns! Find great deals on eBay for Mikuni Bn 44. Kit includes genuine Mikuni parts, items 1 - 16 from drawing to rebuild one carburetor body. Extensive testing provided greater airflow and fuel flow translating into maximum horsepower. Extensive testing has optimized both air and fuel flow to deliver maximum performance. 5 65 gram Primer 2. The Super BN Series offers enhanced airflow, a higher capacity fuel pump, and externally adjustable metering screws, along with replaceable jets for straightforward high and low-speed tuning. Rebuild kit BN44 Square Pump Carb MK-BN38/44 SPR 025-651 025-651 10. 5. Fits all Mikuni Super BN Carbs 38/40i/44/46mm, 4 screw pump cover. Needle Valve not included in kit BN34, BN38 & BN44 Round Pump Carb MK-BN38/44 025-650 Needle Valve Sets for BN34/38/44Genuine Mikuni replacements. NOTE: These are aftermarket carburetors and may require modifications to make them work with stock linkage and fuel routing. When I let go of throttle and then pin it, nothing fires and acts like there isn't any fuel getting to engine, then it will come out of it for a bit and if i hold her WOT it happens too. This carb model is used on many of the yamaha polaris wet jet waverunner superjet waveblaster models. Refer to images 2 & 3 for more information Includes - (1) Carburetor; comes as shown in the first image Updated Version of Mikuni’s BN Series carburetor. 3 needle valve and 65 gram spring for 15 lbs. Shop Mikuni Mikuni Needle Valve Rebuild Kit for Mikuni Super BN 38mm and 44mm Carburetor now. Individual replacement pieces are available for the Mikuni Super BN 38mm, 44mm and 46mm carburetors. Revitalize your jet ski's performance with the Genuine Mikuni Carburetor Rebuild Kit for Super BN models. my mods include a mariner scoop intake grate, stock imp, shaved head, westcoat exhaust deverter, kerker full pipe and a pisser tapped into the stinger line, and lastly a mareiner waterbox. Product Description The ROP Shop replacement Carburetor Specs - Main Bore: 44mm. Perfect for personal watercraft (PWC) owners looking to service their carburetors with confidence. 3 High performance Mikuni 44mm Super BN (SBN) R-Type carburetors with extended throttle shaft. Aug 6, 2013 · Spring Enrichener Type Needle Valve BN44-40-8052 44 125 100 1. MOTOHELP Is an Authorized MIKUNI Distributor/Dealer. pdf Mikuni offers a rebuild kit for it’s old round body BN Jet Ski carburetor that contains all the necessary 0-rings, gaskets, check valves, diaphragms, washers and springs to completely rebuild your carb and make it run like new again. the super BN earns its name because of the increased performance it delivers over previous Mikuni BN Carbs. Nov 3, 2025 · OEM Mikuni replacement kit Fits all Mikuni 34 / 38 / 44 BN round body carbs Includes all gaskets, diaphragms, o-rings, check valves All parts needed for complete rebuild Buy 1 kit per carb. Part number - MK-BN38/44 SPR (please see image listed for carb rebuild application to know if this carb kit is right for your ski). We have a great online selection at the lowest prices with Fast & Free shipping on many items! Performance single Mikuni Super BN 44mm JetSki carburetor with extended throttle shaft to make dual kits. The Super BN Carburetor for high performance applications is the latest in a series of watercraft carburetors from Mikuni. We strongly recommend the reading of that document before reading this one. Mikuni Carburetors are original equipment on most new Yamaha Watercraft. NEW GENUINE MIKUNI SUPER BN / SBN CARB REBUILD KIT. 8K subscribers Subscribed. Nov 6, 2025 · GENUINE MIKUNI SUPER BN 38 40i 44 CARB CARBURETOR REBUILD KIT. If your jet ski is running poorly or showing signs of throttle lag, this high-quality rebuild kit is your solution. Jan 6, 2008 · An example is a customer who used a 44 Mikuni off his Blaster, and another 44 Mikuni off his buddy's 650 Super Jet to make a dual 44 carb kit. Pilot in your discription is the mid screw? Used to working on 4-stroke bikes where the pilot jet and its mixture screw control the idle and High-quality Mikuni Super BN SBN carb rebuild kit compatible with various jet ski models, including Seadoo and Yamaha, ensuring optimal performance and reliability. Shop with confidence. This kit contains parts needed to rebuild one Mikuni Super BN38mm, 44mm, 46mm and i Series Personal Watercraft Carburetor Aug 27, 2017 · Re: BN44 Tuning Tips Excellent info! That was the best read I've seen on a BN carb. 90' 550SX "Shaved head, . Designed to give maximum performance with a single carb. com FREE DELIVERY possible on eligible purchases Genuine Mikuni INDIVIDUAL PARTS FOR 38/44/46/40i MIKUNI SBN SUPER BN CARBURETOR. One thing that is confusing though is you refer to high, low, and pilot. It's good info that deserves to be stuck at the top. Needle valve replacement kit for Super BN 44, contains a Viton 2. I run a stock box on my conversion ski and it does just fine with the larger engine. Aug 17, 2012 · About this item Needle & Seat with Viton tip 1 per carburetor 2. Louder isn't necessarily better either. Exact kit you will recieve is picturedMay fit other years/models than what is listed below KAWASAKI JS300 1986-1991JS400/ JS440 1977-1990JS550 1982-1990 SEA-DOO SP 1988-1991GT Nov 11, 2025 · Genuine Mikuni Super BN 38 40i 44 Carb Carburetor Rebuild Kit MK-BN-38/44 SPR. These carbs are huge performance upgrade for the older 550 650 750 jetski models These are one of the best performing and easy tuning carburators that money can buy The most popular mod for an all-around performance Mikuni High Performance Super BN Carburetors are specifically engineered for high horsepower racing watercraft. 1. Needle & Seat assemblies not included and sold separately. Tuning Tips & Manual Downloads Please Note: Other than exact replacement OEM carburetors, all Mikuni Aftermarket Carburetors and Tuning Components are sold “As Is” for Off Road / Racing Use Only and are not intended or approved for use on vehicles operated on Public Roads or in Locations where applicable engine tampering and anti-pollution laws apply. Kit includes genuine Mikuni parts, items 1 - 15 from drawing to rebuild one carburetor body. " Atlantic Jet Sports carries a complete line of Genuine Mikuni Carburetor internal parts for Mikuni Super BN Carburetors. O-Ring, Needle Valve KV/10 002-709 12. Sep 7, 2009 · Re: Fine tuning the bn44 carb on a stock js550 put these settings to it: 15/16 of a turn on the top screw 1 and 1/8 on the middle, 1 and 5/16 on the bottom (pilot) then, tie it off to a dock or a tree in waist-high water at the back of the tray with about 15 ft. start the ski and pin the throttle Apr 6, 2012 · Restore peak performance to your Mikuni Super BN carburetor with this premium-quality rebuild kit. Feb 5, 2016 · GENUINE MIKUNI BN CARB REBUILD KIT OEM Mikuni replacement kitFits all Mikuni 34/ 38/ 44 BN round body carbsIncludes all gaskets, diaphragms, o-rings, check valvesAll parts needed for complete rebuildBuy 1 kit per carb. The 44 is a better carb and that cylinder is more aggresive then the early 550's that came with a BN38. The fuel pump and jet sections are separate for easier maintenance. So, after I get the Low Screw set for strong idle, if it hesitates on acceleration, do I adjust the Pilot out or in? I have a pretty good ear for rich or lean, but after many years, never really understood the Pilot Screw. Features a viton tip needle valve to provide optimum pop-off and a primer-type cold start system (no butterfly choke) to increase air flow. Jan 30, 2007 · Buy Mikuni Super BN Rebuild Kit MK-BN38/44 SPR: Rebuild Kits - Amazon. Here are my highlight notes I got out of it. Hopefully it will help others. Uses butterfly choke for easy starting. This Mikuni super BN carburetor is the original equipment replacement for Yamaha Superjet Jet Ski. The kit includes the parts pictured to rebuild 1 (ONE) carburetor. Features standard stock jetting, butterfly choke, and 44mm main bore. MK-BN38/44 REBUILD KIT FOR BN-34, BN-38, & BN-44 CARBS (INCLUDES ITEMS 1-15) This is A GREAT DEAL ON BRAND NEW COMPLETE SUPER BN 44 CARBURATOR ASSEMBLY. Mikuni Carburetors should be replaced BN (round pump carb type) EXPLODED VIEW BN38/44 Carburetor Rebuild Kit For Standard Round BN carburetor. Single carb jetting. BN44-40-8052 44 Mikuni SBN Stock Jetting Specifications Low Speed Jet: 100 High Speed Jet: 125 Needle Valve: 2. 0 needle n seat, with a 65grm spring ( Feb 5, 2016 · Buy Mikuni Super BN SBN Carb Rebuild Kit Jet Ski 38 44 46 Seadoo Yamaha 451460: Carburetors - Amazon. Find top brands, exclusive offers, and unbeatable prices on eBay. 0mm BN 38/44 Mikuni Yamaha Super BN Carburetor Rebuild Kit includes all gaskets, seals and diaphragms necessary to rebuild Mikuni Super BN carburetors. Instructions included. What differentiates the Super BN from previous BNs? 1). Find many great new & used options and get the best deals for Mikuni - BN44-40-8067 - Super BN Series 44mm Carburetor at the best online prices at eBay! Free shipping for many products! Find many great new & used options and get the best deals for Mikuni - MK-BN38/44 - Genuine BN Diaphragm Repair Kit at the best online prices at eBay! Free shipping for many products! Aug 25, 2012 · Re: Question for Mikuni BN round body expert Get a 44 for that motor. I. 3 Arm Spring (Grams): 65gr. Cometic Copper Head gasket, JetSport High compression head (the domes look about 66-75% the size of the stock head), stock mikuni 44 BN carb, Accel flame arrestor (maybe), diabled Rev-limit valve, Westcoast "Works" pipe, Mariner Exhaust mainfold, Wiseco pistons Mikuni Super BN BN38, BN44, BN46 Watercraft Carburetor Owner's Manual provides detailed instructions on installation, adjustment, and tuning for these high-performance carburetors. Mikuni Carburetor Fuel Pump Rebuild Kit MK-BN38/44 Mikuni offers a rebuild kit for it's old round body BN Jet Ski carburetor that contains all the necessary 0-rings, gaskets, check valves, diaphragms, washers and springs to completely rebuild your carb and make it run like new again. com. Exact kit you will recieve is pictured May fit other years/models than what is listed below KAWASAKI JS300 1986-1991 JS400 / JS440 1977-1990 JS550 1982-1990 Introduction to Super BN Carbs The Super BN Carburetor for high performance application is the latest in a series of watercraft carburetors from Mikuni. They are easily tunable with replaceable jets and externally adjustable metering screws. Genuine Mikuni Carburetor Rebuild / Repair Kit for Mikuni SBN 38/44/46mm Carburetors. Make sure you get the 88-90 44 however. I'm assuming my issue is popoff, I'm not sure why the seat is 1. Jul 30, 2012 · Re: Mikuni 44bn carb tuning help I noticed this was posted 5 years but I am working on my 1988 sx650. This document is an update of our first carb tuning document. While the two 44 carbs looked identical externally, the internal circuitry drilled into the carb bodies (from the factory) was very different. High performance Mikuni 44mm Super BN (SBN) R-Type carburetors with extended throttle shaft. The technicians of Group K intend this document will provide the most current possible fine tuning information for the Mikuni “Super BN” and “I” series, as well as the Keihin CDK II series carbs as they are applied to personal watercraft. pdf BN44 Metering Screw Genuine Mikuni Carburetor Kit1 Kit per CarbKit includes all necessary gaskets, diaphragms and hardware required to disassemble and rebuild a Mikuni carburetorSquare Body DiaphragmFits Super BN Body 38mm, 44mm and 46mm carbs. 5mm+ Wiseco pistons, SBN 44, Kerker exhaust, Mariner waterbox, WestCoast OS Gas Tank, extended ride plate, (440 pump) 16deg SS Skat imp. You can tell by the holes drilled at the bottom mounting surface of the carb. 00 1. The larger carb will help feed the engine a litle better you will see some slight gains. Dual carb jetting. I will find out tonight. It’s compatible with various Mikuni carburetor sizes, including 38mm, 44mm, 46mm, 48mm, 49mm, 50mm Jan 30, 2007 · Buy Mikuni 13-5060 High Performance Super Bn Carburetor 44Mm: Carburetors - Amazon. "R-Type" models are race equipped, choke body is removed, jetting and pop-off pressure is set for competition use. 0 High Speed Adjuster: 1. Jul 27, 2009 · I have a js550 with an sbn44. Jan 8, 2012 · Re: 44 sbn carb on my js550 Square body Mikuni carb is an sbn. The Super BN earns its name because of the increased performance it delivers over previous Mikuni BN Carbs. Does not include Needle Valve Mikuni No. All parts needed for complete rebuild of 1 Carburetor(except needle valve). ALL PIECES SOLD EACH. com FREE DELIVERY possible on eligible purchases SUPER BN (square pump body) EXPLODED VIEW Super BN Carburetor Rebuild Kit. Mikuni Super BN carburetors were specially designed to meet the performance needs of high horsepower watercraft racing machines. Includes all parts pictured to rebuild your carburetor. S. I put a BN 44 carb on it and there are dead spots. Kit includes the following parts as pictured: Internal Gaskets One Fuel Filter One Diaphragm O-Rings Metering Arm Shop Mikuni Mikuni Needle Valve Rebuild Kit for Mikuni Super BN 44mm and 46mm Carburetor now. Shop now for fast shipping and easy returns! OEM Mikuni replacement kit Fits all Mikuni Super BN Carbs 38/40i/44/46mm, 4 screw pump cover All parts needed for complete rebuild of 1 Carburetor (except needle valve) Exact kit you will recieve is pictured SEA-DOO SP 1992-1998 SPI 1992-1996 SPX 1993-1999 HX 1995-1997 XP 1992-1997 GS 1997-2001 GSI 1997-1998 GSX 1996-1998 GTI 1996-2005 GTS 1992 Rebuilding a Mikuni Diaphragm Carburetor (BN, SBN, SBN-I, etc) trythistv 12. Mikuni High Performance Super BN Carburetors are specifically engineered for high horsepower racing watercraft. Fits all square body Mikuni Carburetors with 4 screws on the pump cover. com FREE DELIVERY possible on eligible purchases Explore a wide range of our Bn44 Mikuni selection. Special needle valves and spri Get the best deals for Mikuni Bn 44 at eBay. com FREE DELIVERY possible on eligible purchases High performance Mikuni 44mm Super BN (SBN) carburetors with extended throttle shaft. Mikuni Super Bn 44mm Carburetor (Single) 1 carburetor silver in color Choice of upgrade package select from drop down menu We will jet this carb to spec if required. lvjil camiw slybygc wipft eww jfznrnz lpollsq hliqjow oktfr rxktck seotsom nhwl jfqo ybr snelzx