SeaEagles Accelerator Pump Conversion Kit for Holley 4150 – 50cc Fuel Pulse, Rebuild Components

SeaEagles 20-11 50cc Accelerator Pump Conversion Kit installs into Holley 4150 carburetors to add a positive fuel shot for crisper, more immediate throttle response.

This conversion kit is engineered to bring an accelerator-pump style fuel delivery to classic carbureted 50cc engines, particularly when adapting Holley 4150-style carburetors on small motorcycles, scooters or custom builds. The SeaEagles kit is precision-machined from durable materials and supplied with the components you need to convert or rebuild the accelerator pump assembly. That results in a quicker fuel metering pulse at throttle openings and a more predictable, controllable surge of power when you demand it.

How does this kit change throttle response during acceleration?

By adding an accelerator pump mechanism the kit provides a short, metered fuel squirt at the instant the throttle is opened. This avoids the momentary lean sensation or hesitation common to carburetors without a pump, producing smoother roll-on acceleration and cleaner transitions in partial throttle conditions.

• Delivers a calibrated 50cc burst of fuel on throttle tip-in.
• Reduces flat spots and hesitation during sudden acceleration.
• Helps maintain richer mixture briefly for immediate engine response.

What components are included and how difficult is installation?

The kit contains the machined pump body parts, seals, metering components and hardware needed for a Holley 4150-style conversion. Installation is straightforward for anyone familiar with carburetor rebuilds: basic hand tools and careful adherence to the included instructions are all that’s required.

• Complete set of pump parts, seals and mounting hardware supplied.
• Fits into existing Holley 4150 housings with minimal modification.
• Installation time typically under an hour for experienced users.

Will this fit my engine or carburetor model?

The SeaEagles 20-11 kit is made to adapt to Holley 4150-style carburetors and works across many 50cc carbureted applications. Verify compatibility by comparing your carburetor’s accelerator pump bore and mounting pattern to the Holley 4150 specification before ordering.

• Designed for Holley 4150-style carburetor housings and throttle assemblies.
• Suitable for most 50cc motorcycle and scooter engines using compatible carbs.
• Check bore size and linkage fitment for a seamless match.

What maintenance or tuning is required after fitting the conversion kit?

After installation you should check the pump stroke length, nozzle placement and mixture while the engine is operating to fine-tune the delivery. Periodic inspection of seals and linkage keeps the pump functional and leak-free.

• Adjust pump stroke to prevent over-rich squirts or flooding.
• Verify nozzle alignment and secure hose connections.
• Inspect O-rings and moving parts during regular carburetor service intervals.

Who is this for: The SeaEagles 20-11 50cc Accelerator Pump Conversion Kit is aimed at vintage-bike restorers, small-engine tuners and custom builders who use Holley 4150-style carburetors on 50cc platforms. It’s ideal for riders wanting sharper throttle response without a full fuel-system redesign, and for mechanics seeking a durable, easy-to-install upgrade part. If you’re converting a carburetor to behave more responsively under acceleration or rebuilding an older accelerator pump on a 50cc application, this kit provides the precision parts and hardware needed to get predictable, repeatable results.