The best gas piston carburetor conversion kits let you run your Honda GX, Predator, Champion, Generac, and similar small engines on alternative fuels like propane, natural gas, or LPG. This guide highlights five reliable options, explains who each kit is best for, and helps you compare features, safety, and compatibility. Ideal buyers include DIY enthusiasts upgrading generators for fuel flexibility, service professionals seeking safe retrofit options, and hobbyists caring about efficient multi-fuel operation.
| Product | Best For | Fuel Options | Notes |
|---|---|---|---|
| YAMAKATO Dual Tri Fuel Carburetor | Multi-fuel users with 196–224 cc engines | Gas, Propane, Natural Gas | OEM-like quality, broad compatibility |
| KELKONG GX390 LPG/NG Kit | Predator/ Honda GX setups | LPG, NG, Gasoline | Strong safety and robust design |
| AUTOKAY Dual Fuel Carburetor | GX390 188F small generators | Gasoline, LPG/NG | Moderate power range, straightforward install |
| HIPA Tri Dual Generator Carb Kit | Champion, Predator, Generac, GX341–GX460 | Gasoline, LPG, CNG | Three-position switch for fuel choice |
| NIMTEK Dual Fuel Carburetor | 4.5–5.5 kW generators | LPG, NG | Focused 5 kW class, compact kit |
YAMAKATO Dual Tri Fuel Carburetor For Predator And GX Engines
Best for mixed-fuel setups on 196–224 cc engines, including Honda GX160/200 and various Predator, Generac, and Champion models. The YAMAKATO kit is positioned as a tri-fuel replacement, accommodating gasoline, natural gas, and propane. It emphasizes OEM-quality components and includes non-asbestos mounting gaskets. This kit is best for users who want a single, versatile carburetor across multiple generator brands and a relatively straightforward swap. A potential limitation is that compatibility is described for “some 196cc 212cc 224cc Champion” models, so exact fit should be confirmed before purchase.
Who it’s best for: DIY installers seeking a broad, multi-fuel option with OEM-grade parts and a single kit that covers several popular engine sizes. Why chosen: broad compatibility and tri-fuel capability support flexible fuel strategies for portable generators.
KELKONG GX390 LPG/NG Conversion Kit
The KELKONG kit targets GX270–390 displacement engines and is designed for a wide range of generators including Generac GP5000/5500/6500 series and WH-series portable units. It supports LPG and natural gas options in addition to gasoline. The kit emphasizes a robust safety-oriented carburetor design intended to maintain operating integrity during mixed-fuel use. A limitation to note is that while the kit cites broad compatibility, exact engine model matching should be verified to ensure proper jetting and mounting fitment.
Best for: users upgrading larger GX-series engines who want reliable LPG/NG operation and compatibility with popular Generac and WH-series generators. Why chosen: strong emphasis on safety-friendly design and broad engine compatibility.
AUTOKAY Dual Fuel Carburetor For GX390
The AUTOKAY kit is geared toward GX390 188F portable gasoline generators, offering dual-fuel capability with LPG/NG as an option. It lists rated and max outputs around 5000–5500 watts, and a stated consumption figure for liquefied gas. This kit is best for users with smaller portable generators who want to run on alternative fuels with a straightforward installation. Limitation: exact compatibility with specific generator models should be verified, as the product focuses on GX390 class engines.
Best for: owners of GX390-based portable generators seeking a simple, cost-effective dual-fuel retrofit. Why chosen: clear wattage guidance and compact design suitable for small to mid-size portable units.
HIPA Tri Dual Generator Carb Kit
This HIPA kit targets a broad range of engines, including Champion, Predator, Generac, and Honda OHV platforms in the 338–460 cc range. It supports gasoline, propane (LPG), and natural gas (CNG) with a three-position rotary switch to pick the fuel. The kit is positioned for owners who want flexibility and a direct replacement for standard carburetors. A potential caveat is that the extensive compatibility notes require careful model-number cross-checks before ordering to ensure a proper fit.
Best for: users needing a three-fuel solution across multiple engine families with an emphasis on a simple switch between fuels. Why chosen: versatile fuel options and a built-in safety feature via the three-position selector.
NIMTEK Dual Fuel Carburetor For Generators
The NIMTEK kit focuses on 4.5–5.5 kW generators with GX390 188F displacement, offering LPG/NG conversion. It lists a 5,000-watt rated output with a 5,500-watt max output. This kit is best for users running mid-range portable generators who want efficient LPG/NG operation without exceeding a moderate power tier. Limitation: the product description highlights general generator compatibility but does not provide exhaustive engine-by-engine fit details, so model verification is advised.
Best for: mid-range portable generators that fit GX390-class engines, seeking reliable dual-fuel operation. Why chosen: balanced wattage and focused engine class with clear dual-fuel intent.
Buying Guide: Key Purchase Considerations
Fuel compatibility and engine match are crucial. Verify the exact engine displacement, model numbers, and mounting points before purchasing a carburetor conversion kit. Look for kits that clearly list the generator brands and series they support, and note whether the kit includes mounting gaskets, choke components, and any required hardware.
- Fuel options: If your goal is propane or natural gas, confirm the kit supports the fuel type and any regulator or hose requirements.
- Wattage needs: Match the kit’s recommended output range with your generator’s continuous and surge power ratings to avoid overloading.
- Installation effort: Some kits require minor modification or professional tuning. Check if the kit provides procedural guidance or installation support.
- Safety features: Look for designs with secure fuel switching, anti-leak mechanisms, and robust construction to reduce the risk of leaks during operation.
- Maintenance and parts availability: Favor kits with readily available diaphragm, gasket, and jet replacements to simplify future maintenance.
Frequently Asked Questions
- What should I consider when selecting a gas conversion kit for my generator?
Consider engine displacement, fuel compatibility, mounting compatibility, and the maximum wattage supported by the kit. - Are tri-fuel carburetors safe for regular use?
Most are designed with safety features like leak-prevention switches; always follow installation instructions and verify proper fuel connections. - Can I install a dual-fuel kit on any GX-series engine?
Not every GX engine is listed as compatible. Check the exact engine model, displacement, and the manufacturer’s compatibility notes. - Do these kits include the necessary gaskets and hardware?
Some kits include mounting gaskets; confirm the contents before purchase to avoid missing pieces. - Is professional installation required for fuel conversion kits?
It depends on the kit and your mechanical skill. If unsure, consult a qualified technician to ensure safe setup and tuning. - Will these kits affect warranty or generator performance?
There can be implications depending on the manufacturer and local regulations. Review warranty terms and local rules before retrofitting.