Various carburetors are available as listed in the jetting chart below.  Following are some highlights of the individual carburetor sizes:

• BN34-28-8010 - Standard 34mm replacement carburetor.
• BN38-34-8113 - Perofrmance single 38mm carbuertor to replace most standard BN or Super BN carburetors.  Features a Viton #2.0 needle valve, extended throttle-shaft for dual or triple carb applications, no butterfly choke, and fuel primer fitting.
• BN44-40-8067 - Performance single 44mm carburetor for most sit down models requiring larger carbs.  Features a Viton #2.5 needle valve, extended throttle-shaft for dual or triple carb applications, no butterfly choke, and fuel primer fitting.
• BN44-40-3 - Original equipment replacement carburetors for Yamaha Superjet models.  Features standard stock OEM jetting, butterfly choke, and a 44mm bore.
• BN44-40-8052 - Performance single 44mm carburetor designed for maximum performance as a single carb installation.  Features a Viton #2.3 needle valve, extended throttle-shaft for dual or triple carb applications, no butterfly choke, angled fuel fittings, and fuel primer fitting.
• BN46-42-8002 - Performance single 46mm carburetor designed for maximum performance as a single carb installation.  Designed to give Pro level racing performance, should be installed by qualified tuners only.  Features a Viton #2.5 needle valve, extended throttle-shaft for dual or triple carb applications, no butterfly choke, angled fuel fittings, and fuel primer fitting.

The Mikuni Super BN carburetors will come ready for immediate installation and will work well with mild to modified engines.  Tuning and performance specs have been developed over the years to suit a wide variety of conditions, however some fine tuning may be required to attain the desired combination of performance, fuel mileage, and drivability.  Extra main and pilot jets are included for tuning and additional genuine Mikuni parts and accessories are always available at low prices.  Alternatively kits can be customized utilizing your own jetting specifications.


You will find a full range of Mikuni parts, accessories, and tools all available listed below to support the BN series carburetors.  Please inquire if you do not see what you need.

Please feel free to contact us with any additional questions or requests, we are available by direct line, IM, or email.  We are available for tuning and setup questions as well as continuing product support after the sale.