Mikuni BSR33-P74 Carburetor

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.