Rebuild Kit - Mechanical Secondary Demon - Gas

The Rebuild Kit for Mechanical Secondary by Demon Carburetion is a comprehensive overhaul set designed specifically for 4150-series carburetors equipped with mechanical secondary systems and configured for gasoline fuel delivery. This rebuild kit restores worn internal components to factory specifications, addressing fuel atomization inconsistencies and transition response that develop after thousands of miles of operation.

The kit includes precision-manufactured seals, gaskets, springs, and valve components optimized for the mechanical secondary circuit. Mechanical secondary systems open progressively as engine load increases, and worn seals allow fuel leakage past the secondary metering block, causing rich stumbling on throttle transition. Replacing these components restores proper fuel delivery curve and eliminates hesitation during acceleration. The kit is engineered to Demon's OEM tolerances, ensuring direct fitment without modification or adjustment beyond standard carburetor rebuild procedure.

This rebuild is ideal for street and strip vehicles running 4150-platform carburetors that have accumulated significant runtime. Whether addressing fuel weeping from secondary ports, erratic idle quality linked to secondary drift, or restoring baseline performance after years of storage, this kit delivers the internal sealing and valve components necessary to return the carburetor to proper operational condition. The mechanical secondary design provides manual control without electronic input, making it a proven choice for carbureted performance applications and classic restoration builds.

Demon Carburetion's rebuild kits are engineered to match the exacting standards of competition and high-performance markets, where fuel delivery precision directly impacts power output and drivability. This mechanical secondary rebuild kit is the OEM-correct replacement for owners maintaining or restoring fuel atomization control in 4150 carburetor applications.