Carburetor 650CFM Circle Track Alcohol Mech. Sec.

The Carburetor 650CFM Circle Track Alcohol Mechanical Secondary from PROFORM is purpose-built for competitive circle track racing where fuel delivery precision and rapid throttle response define lap times. This carburetor is engineered specifically for alcohol fuel systems, which burn cooler and require different jetting and calibration than gasoline equivalents. Circle track racing—whether short-track dirt or asphalt competition—demands a carb that responds instantly to driver input while maintaining consistent air-fuel ratios through high-rpm acceleration and sustained cornering loads.

The 650 CFM flow rating positions this carb as an ideal match for mid-displacement circle track engines that need metered fuel delivery without excessive cfm overhead. The mechanical secondary design is central to this carb's race-track performance. Rather than relying on vacuum-operated secondary barrels, mechanical secondaries open progressively as the driver increases throttle position, ensuring that fuel delivery matches engine demand without lag or hesitation.

The alcohol-specific calibration ensures proper atomization and burn characteristics with methanol or ethanol fuel blends, preventing lean-condition detonation and optimizing power output across the rpm band. This carburetor is ideal for racers looking to enhance their performance on the track, providing the reliability and responsiveness needed to maintain momentum and gain competitive advantage.