Intake Manifold Adapter Kit for Predator & Honda GX

NIBBI Racing | Performance Intake System INTAKE MANIFOLD ADAPTER KIT BUILT FOR BETTER AIRFLOW. Upgrade your engine's intake setup with the NIBBI Racing Intake Manifold Adapter Kit. Precision CNC-machined from high-strength aluminum alloy, this manifold is designed to connect compatible large-displacement engines with the NIBBI PWK34 carburetor. Its smooth internal passage, secure connection design, and optional vacuum pulse port make it a practical solution for performance-focused engine builds. CNC-MACHINED ALUMINUM PWK34 COMPATIBLE SMOOTH AIRFLOW VACUUM PULSE PORT Why Choose NIBBI The Connection Behind Your Performance A dependable intake connection is essential for consistent engine operation. The NIBBI Intake Manifold Adapter Kit creates a connection between your carburetor and engine, helping deliver the air-fuel mixture through a smooth, securely sealed intake passage. 01 / AIRFLOW Smooth Intake Passage The precisely machined internal passage is designed to minimize unnecessary intake restrictions and support smooth air-fuel mixture delivery to the engine. 02 / DURABILITY Strong Aluminum Construction Built from high-strength aluminum alloy with a black anodized finish, the manifold offers durability, corrosion resistance, and reliable performance in demanding engine environments. 03 / FLEXIBILITY Ready for Custom Builds A pre-drilled vacuum pulse port supports compatible pulse-type fuel pump installations, while the removable brass plug allows the port to remain sealed when not in use. Precision Construction Precision-Machined. Built to Last. The NIBBI intake manifold features solid billet aluminum construction, shaped through precision CNC machining for a clean and consistent finish. Its smooth internal surface helps reduce unnecessary airflow resistance, while carefully machined mating surfaces support proper sealing when installed with compatible components. The black anodized finish provides an additional layer of corrosion resistance and gives the manifold a sleek, performance-inspired look. Engineered for Demanding Builds ✓ High-strength billet aluminum construction ✓ Precision CNC-machined surfaces ✓ Smooth internal intake passage ✓ Black anodized protective finish ✓ Corrosion and heat-resistant construction ✓ Designed for secure, leak-resistant installation Recommended Carburetor Pairing DESIGNED TO WORK WITH NIBBI PWK34. Take your intake upgrade further with the NIBBI Racing PWK34 Carburetor. This manifold adapter kit is designed to provide a compatible mounting connection for the PWK34's 40 mm engine-side spigot. Together, the manifold and carburetor create the foundation for a customizable intake setup on compatible engines. Carburetor tuning and additional installation adjustments may be required depending on your engine build. PWK34 Carburetor 34 mm Bore | 40 mm Engine-Side OD EXPLORE NIBBI PWK34 → PWK34 carburetor sold separately. Engine Compatibility Built for Popular Engine Platforms Designed for selected Predator, Honda GX-Series, and Briggs & Stratton engines, this intake manifold adapter offers a convenient starting point for carburetor upgrades on mini bikes, go-karts, and other compatible small-engine applications. PREDATOR Predator Engines Predator 301cc (8 HP) Predator 420cc (13 HP) HONDA GX SERIES Honda Engines Honda GX240 Honda GX270 Honda GX340 Honda GX390 BRIGGS & STRATTON Briggs Engines Briggs 1450 Series 305cc Engine Compatibility Reminder: Please verify your engine model, intake mounting pattern, carburetor connection dimensions, and available installation clearance before purchasing. Flexible Fuel System Setup Pre-Drilled Vacuum Pulse Port The integrated vacuum pulse port adds flexibility for custom fuel system installations. Designed to provide an intake vacuum signal where compatible, this port can support certain pulse-type fuel pump configurations without additional manifold drilling or tapping. OPTION 01 / BRASS PLUG Standard Setup — Port Sealed When a pulse-type fuel pump is not being used, install the brass plug to securely seal the vacuum port. Proper sealing prevents unwanted air from entering the intake system and helps maintain consistent engine operation. OPTION 02 / VACUUM BARB Pulse Fuel Pump Setup For a compatible pulse-type fuel pump installation, replace the brass plug with the vacuum barb fitting and connect the appropriate pulse hose. Confirm that your fuel pump supports an intake-manifold vacuum signal. Vacuum Port Notice: The pre-drilled port is intended for an appropriate vacuum pulse connection, not as an open supplemental air inlet. Always seal the port with the brass plug when it is not in use to avoid vacuum leaks and unstable engine operation. Connection & Sealing Secure Fit. Reliable Connection. A properly sealed connection between the carburetor and engine is essential for predictable throttle response and reliable engine operation. The high-temperature-resistant silicone coupling provides a flexible connection between compatible intake components, while the stainless steel clamp helps maintain a secure fit during operation. Together with the precision aluminum manifold, these components support a stable intake connection with reduced risk of air leakage when correctly installed. Reliable Connection Details ✓ High-temperature-resistant silicone connector ✓ Corrosion-resistant stainless steel clamp ✓ Secure carburetor-to-manifold connection ✓ Precision-machined surfaces for proper mating ✓ Designed to help minimize intake air leaks Installation Overview Straightforward Installation. Built for Your Next Upgrade. With the correct engine mounting pattern and compatible intake components, the NIBBI manifold offers a practical solution for custom carburetor installations. 01 Mount the Manifold Position the intake manifold against the engine's intake mounting surface. Use the appropriate gasket and mounting hardware, ensuring correct alignment and sealing. 02 Connect the Carburetor Attach the compatible carburetor using the silicone coupling. Secure the connection with the appropriate clamp and confirm the carburetor is properly supported. 03 Check & Fine-Tune Seal or connect the vacuum port as required. Inspect all connections for leaks, verify throttle operation, and tune the carburetor for your engine configuration. Product Details Technical Specifications Product Name Intake Manifold Adapter Kit Brand NIBBI Racing Manifold Material CNC-Machined Aluminum Alloy Surface Finish Black Anodized Compatible NIBBI Carburetor PWK34 — 40 mm Engine-Side Spigot Outer Diameter Coupling Material High-Temperature-Resistant Silicone Clamp Material Stainless Steel Vacuum Port Pre-Drilled Port for Compatible Pulse-Type Fuel Pump Applications Vacuum Port Options Brass Sealing Plug / Vacuum Barb Fitting Compatible Engine Families Predator 301cc / 420cc; Honda GX240 / GX270 / GX340 / GX390; Briggs 1450 Series 305cc Potential Applications Mini Bikes, Go-Karts, and Other Compatible Small-Engine Equipment Compatibility & Installation Check Your Setup Before You Order While this manifold is designed for selected popular engine platforms, successful installation depends on the specific engine configuration and the components used in your intake system. Before Purchasing 1. Confirm Your Engine Model Check your exact engine model and compare the intake flange mounting pattern with the original manifold. 2. Verify Carburetor Dimensions This kit is designed for the NIBBI PWK34 carburetor with a 40 mm engine-side spigot. Other carburetors require dimensional verification. 3. Check Installation Clearance Ensure sufficient clearance for the carburetor, air filter, throttle cable, frame, and surrounding engine components. 4. Configure the Vacuum Port Use the brass sealing plug when no compatible pulse fuel pump connection is required. Never leave the vacuum port open. Installation Note: Ensure all mounting surfaces, gaskets, couplings, and clamps are properly installed and sealed. Verify throttle movement, fuel system compatibility, and intake airtightness before operating the engine. Carburetor jetting and tuning may be required after installation. Professional installation is recommended for modified engine applications.