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The ARC DJ-1026 Performance Kit is a high-performance upgrade for Predator 420cc, GX390, and GX340 engines, designed to increase horsepower, RPM capability, and durability. Includes billet components, camshaft, and valvetrain upgrades for big block performance builds. See full product details below.
The ARC DJ-1026 Performance Kit is designed for Predator 420cc, Honda GX390, and GX340 engines where increased horsepower, higher RPM capability, and improved durability are the goal. This kit is built specifically for big block engines used in minibikes, go-karts, and racing applications.
Big block engines produce significantly more torque and load than small block platforms, which makes upgrading the rotating assembly critical. Billet flywheels and connecting rods are essential components that allow the engine to safely operate at higher RPM without risking failure.
The included performance camshaft and upgraded valve springs improve lift and duration, allowing the engine to breathe more efficiently and produce greater power across the RPM range.
This matched component system is engineered to work together, providing a reliable performance increase while maintaining stability in demanding applications.
Important Fitment Notice: Designed for GX340/GX390/Predator 420-style engines. Not compatible with Predator 212, Predator Ghost, or small block clone engines.
This kit fits Predator 420cc, Honda GX390, GX340, and similar big block clone engines.
Yes, this kit is compatible with GX340 engines.
Yes, this is designed for high-performance and racing applications.
No, a carburetor is not included and must be upgraded separately for best performance.
Big block engines produce more torque and stress, so billet components are required to safely handle higher RPM and prevent failure.
Complete your engine build with ARC Racing components including high-performance carburetors, billet side covers, and upgraded exhaust systems. Pair this kit with a performance carburetor and header to maximize airflow and horsepower.
