HardDrive 40mm CV Carburetor – Upgraded Brass Inlet – Includes Jets & Hoses – Racing Use Only

OVERVIEW

The HardDrive 40mm CV Carburetor is a performance-focused replacement carburetor built for upgraded throttle response and long-term reliability in modified engine applications. Constructed with an upgraded brass fuel inlet instead of factory plastic, it resists fuel degradation and heat stress under aggressive riding conditions. Designed for applications where precise air-fuel mixture adjustment is required to maximize power output.

ENGINEERING & PERFORMANCE

The brass fuel inlet eliminates the brittle failure point common in stock plastic fittings, extending service life under high-temperature and ethanol-blend conditions. Direct interchangeability with OE Keihin–style CV carburetors allows straightforward bolt-on installation without custom fabrication. Multiple included tuning jets provide rapid baseline adjustments for dyno calibration or track tuning, while retained stock-style choke cabling maintains predictable cold-start operation. Updated internal components deliver smoother throttle needle movement and reduced flooding risk during sustained high-RPM runs.

KEY FEATURES

• 40mm constant-velocity (CV) carburetor body
• Upgraded brass fuel inlet replaces standard plastic fitting
• Includes fuel supply line and vent hose
• Additional tuning jets provided: slow jets (#45, #48, #50) and main jets (#185, #190, #200)
• Updated internal components ensure direct interchange with OEM Keihin CV carburetors
• Accepts stock-style choke cable operation (cable not included)
• Factory-recommended rebuild kit readily available for routine maintenance
• Marked for racing use only; not street-legal in California or on pollution-controlled vehicles

TECHNICAL SPECIFICATIONS

• Brand: HardDrive
• Part name: 40mm CV Carburetor – Upgraded Brass Inlet
• Part Type: Driveline
• Material: Brass fuel inlet

FITMENT

• Universal — fits most Harley-Davidson models as specified.

WHY HARLEY RIDERS CHOOSE THIS

Riders modifying older or high-performance Harley engines select this carburetor when factory plastic inlet tubes crack under vibration or degrade from modern fuel additives. The brass fuel connection delivers consistent flow during hard acceleration while resisting chemical breakdown, reducing unexpected lean-outs that compromise throttle stability. Pre-included tuning jets and Keihin-compatible mounting geometry cut setup trial-and-error, preserving familiar choke behavior for reliable cold starts. This balance of durable components, accessible aftermarket support, and precise airflow characteristics makes it a practical choice for Sportster builds, custom softails, and vintage fairing installations that still require calibrated carburetion.