Mikuni BST34 Carburetor – 34mm CV #BST34-288. Constant Velocity with a Flat Slide for Faster Response. This carburetor is designed primarily as an OEM replacement for 2002-2006 Polaris Sportsman 700 ATVs. Known for smooth throttle transitions and maintaining an optimal air-fuel ratio across varying conditions.

Special Order Item. This item Drop Shippable from Mikuni.

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.

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