Hipa propane conversion carburetor kit for 338–460cc generators — 389/420cc fit, multi‑fuel (gasoline/propane/CNG)

HIPA's propane conversion carburetor kit lets compatible 338–460cc generator engines run on gasoline, propane (LPG), or natural gas (CNG) with a three-position rotary valve and manual choke for dependable starts.

This conversion kit replaces the factory manual-choke carburetor on many Honda GX-series clones and comparable generator engines to provide multi-fuel flexibility for portable power units. Built for applications in the 338cc–460cc range, the assembly is engineered to fit popular portable generator models from Champion, Predator, Generac, Westinghouse, Powermate and others that share the standard manual choke carburetor layout. Before installing, confirm your engine displacement, carburetor mounting pattern and available engine-bay clearance to ensure a correct fit.

Will this kit work with my generator engine?

It fits most GX340/GX390-style engines and their clones in the 338–460cc displacement range, and is intended as a direct replacement for a standard manual-choke carburetor. Compatibility centers on matching engine size and the original carburetor's mounting and choke arrangement.

• Compatible with Honda GX340/GX390 clones and similar OHV engines (338cc–460cc).
• Works with Champion models listed (338cc, 389cc, 439cc part numbers).
• Fits Predator 420cc series and many Generac GP-series units with similar carburetor layout.
• Confirm physical clearance and throttle/choke linkage before buying.

How is fuel selection and safety handled?

The kit uses a three-position rotary switch: gasoline, off, and LPG/CNG; the OFF position helps prevent gas flow when the system is not in use. A manual choke lever is included for controlled cold starts, and installation follows standard fuel-line and regulator practices for gaseous fuels.

• Three-position rotary valve for gasoline/OFF/propane-or-natural-gas operation.
• Manual choke lever for reliable starting in cool conditions.
• Install with the correct LPG regulator and hoses rated for gaseous fuel.
• OFF position isolates fuel to reduce leak risk when parked.

What models and power brands are mentioned as compatible?

The manufacturer lists compatibility with a broad set of portable generator models that use GX-style manual-choke carburetors. This includes specific Champion and Generac part references and several popular consumer-brand series where engine displacement and carburetor type match.

• Champion generators: listed 338cc, 389cc, 439cc models (check part numbers).
• Predator 7000/7250/8750/9000 420cc models and Ford 420cc variants.
• Generac GP-series (GP7500E, GP5500, GP6875) and related part numbers.
• Westinghouse, Powermate, Power SUA and other 340–460cc generators with similar carburetors.

What should I check before ordering and installing?

Measure the engine compartment and compare mounting points to your existing carburetor, and verify the engine displacement and choke style. Proper regulators, fittings and knowledge of gaseous fuel plumbing are essential for a safe, compliant installation.

• Confirm engine size (338–460cc) and that your carburetor is a manual-choke style.
• Compare bolt pattern and throttle linkage positions to avoid fitment issues.
• Plan to install a certified LPG/CNG regulator and rated hoses.
• Allow space for the rotary switch and routing of gas lines in the engine bay.

Who is this for: This HIPA carburetor conversion kit is aimed at owners of portable generators with Honda GX-series style engines who want flexible fuel options—homeowners preparing for outages, jobsite users seeking cleaner-burning propane, and hobbyists who maintain and upgrade small-engine equipment. It is intended for mechanically capable users or professional installers familiar with fuel systems and gaseous fuel safety practices.