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HARDDRIVE 40 mm CV Carb Slide Diaphragm Upgrade or replace the diaphragm on your constant velocity (CV) carburetor with the HARDDRIVE 40 mm Carb Slide Diaphragm. Engineered for precise throttle response and reliable sealing, this OEM-fit component restores smooth acceleration and consistent fuel delivery. Key Features Size: 40 mm — fits compatible CV carb slides Durable material: high-grade rubber for long-lasting flexibility and resistance to fuel and heat Direct replacement: designed for easy installation with original equipment specifications Improved performance: restores vacuum-operated slide action for consistent throttle control Benefits Eliminates flat spots and uneven idling caused by worn diaphragms Enhances throttle precision for better rideability Cost-effective maintenance part to extend carburetor life Whether you're performing routine maintenance or repairing a CV carburetor, the HARDDRIVE 40 mm CV Carb Slide Diaphragm delivers reliable fit and performance. Check compatibility with your carburetor model before purchase.