Mikuni Racing – BSR Carburetor – CV 33mm – Yamaha Big Bear 400 #BSR33-P48. Genuine Mikuni. Made in Japan.
Fits: Yamaha Big Bear 400 ATV’s – YFM400 / YFM400F / YFM400FW / YFM400N – 2003–2006
Rebuild Kit Part Number: #MK-BSR33
Mikuni’s BSR and BST carburetors are highly regarded for their reliability, smooth operation, and adaptability across a wide range of motorcycles and ATVs. Both the BSR and BST models offer seamless throttle transitions, reducing engine stutter or hesitation during acceleration. Their constant velocity (CV) design inherently improves fuel efficiency by maintaining an optimal air-fuel ratio across varying operating conditions.
The BSR series is a CV carburetor featuring a uniquely shaped, diaphragm-controlled slide for quick response and precise control. This design allows the carburetor to adjust the slide position based on pressure differences between the venturi and diaphragm chamber, rather than being directly linked to the throttle. BSR carburetors are known for delivering smooth acceleration and improved fuel efficiency, making them popular in mid-sized to large motorcycles and ATVs.
The BST series, on the other hand, uses a flat slide for faster response. Known for their versatility, BST carburetors are widely used in both street and off-road motorcycles and ATVs. They are especially favored in dual-sport motorcycles due to their balanced performance and fuel economy.
Special Order Item. This item Drop Ship-able from Mikuni American. Please inquire for availability and current lead times.
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