Hipa propane conversion carburetor kit for Honda GX340/GX390/GX420 338–460cc — 3-position switch, manual choke

Hipa's propane conversion carburetor kit lets 338cc–460cc Honda GX-style portable generators run on propane, natural gas, or gasoline with a simple 3-position rotary switch.

This kit replaces the factory manual-choke carburetor on many Honda GX340/GX390/GX420-style engines and compatible clones, enabling multi-fuel capability for Champion, Predator, Generac, Westinghouse, Powermate and other popular portable generators. It’s engineered as a drop-in style replacement for standard manual-choke carburetors, and includes a choke lever, fuel fittings, and controls to switch between fuel sources without complex modifications.

Which generators and engines work with this Hipa conversion kit?

The kit is built for Honda GX-series clone engines in the 338cc–460cc range and many factory models that use the same manual-choke carburetor footprint. It lists compatibility with Champion 338cc/389cc/439cc models, Predator 420cc units, Generac GP series, Power/Westinghouse models and a wide range of 340cc–460cc portable generators.

• Fits Honda GX340, GX390, GX420 and common clone engines
• Compatible with Champion, Predator, Generac and other brands using similar carburetors
• Works with many 6000–10000W portable generators in the specified displacement range
• Confirm engine displacement, choke type, and compartment clearance before purchase

How do I switch fuels and start the generator in cold weather?

Fuel selection is handled by a three-position rotary switch: gasoline, propane/natural gas, and OFF to eliminate leak risk when not in use. The manual choke lever gives reliable cold-start control so you can start on gasoline and then switch to propane once warm.

• 3-position rotary switch for gasoline, LPG/CNG, and OFF
• Manual choke lever for cold-start assistance
• Simple hand-operated fuel changeover without complex tools
• OFF position helps prevent accidental fuel flow when parked

What components and installation considerations should I expect?

The kit includes the conversion-style carburetor with fittings for gaseous fuel, the choke assembly, and mounting provisions designed to match common manual-choke carburetor bolt patterns. Installation typically requires basic hand tools, fuel line connections, and checking clearances around the carburetor body.

• Direct-replacement carburetor body and manual choke lever included
• Hose fittings for propane and natural gas hookups
• Requires basic mechanical skills and verification of physical fitment
• Not suitable for generators lacking standard manual-choke carburetors or adequate clearance

Will this affect engine performance or maintenance?

The conversion allows flexible fuel choice but does not change core engine specifications; performance may vary slightly with propane or natural gas compared to gasoline. Routine carburetor maintenance and inspection remain important — check jets, seals, and fuel connections periodically, especially when switching between fuel types.

• Fuel-dependent power and runtime differences are normal
• Regular inspection of hoses and fittings recommended
• Maintain carburetor jets and choke like a standard manual-carburetor setup
• Keep vendor compatibility notes and engine displacement handy during service

Who is this for? The Hipa 389cc–420cc tri-dual propane conversion carburetor kit suits DIY-savvy generator owners and small contractors who want the flexibility of running on propane or natural gas without swapping engines. It’s ideal for users who have Honda GX-style engines or clones in the 338cc–460cc range, own compatible Champion/Predator/Generac models, and can verify physical fitment and basic installation capability. If you need multi-fuel options for emergency backup, remote work, or cleaner on-site fueling, this kit provides a straightforward retrofit option — just confirm engine model and space before ordering.