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Honda GX340 / GX390 / GX420

Honda GX390, GX340 & GX420 Engine Parts – Maximize Power, Efficiency & Reliability

Empower your Honda GX390, GX340, and GX420 engines with high-performance parts and upgrades that bring out their full potential. These engines are known for their reliability, strength, and versatility, powering a wide range of applications from heavy-duty industrial equipment to off-road recreational vehicles. Our selection of parts for the GX390, GX340, and GX420 models offers the quality and innovation you need to optimize performance, boost power, and increase efficiency.

Differences Between GX390, GX420, GX460, and GX340

Each of these engines varies in terms of displacement, power output, and application suitability:

  • Honda GX390: Offers excellent mid-range performance with 389cc displacement, commonly used in industrial and commercial applications.
  • Honda GX420: An upgraded version of the GX390 with 420cc displacement, providing more horsepower and torque for demanding tasks.
  • GX460 Honda: The most powerful option with a 460cc displacement, ideal for high-performance applications requiring maximum output.
  • Honda GX340: A reliable choice with 337cc displacement, perfect for smaller applications needing efficiency and durability.

Performance Parts for Honda GX Series Engines

Enhancing the performance of your Honda GX engine requires high-quality aftermarket parts. Below are some of the best upgrades available.

  • 6622 Electric Start ARC Billet Flywheel

    6622 Electric Start ARC Billet Flywheel, Honda GX340/GX390

    (3)

    SFI certified ARC Racing GX390 Electric Start Adjustable Flywheel for the Honda GX340 / GX390 / 420cc / 460cc engines. The ARC Billet Flywheels are CNC machined from 6061 T-6 Aluminum. It weighs 5.40 lbs. The main feature of this design is the steel...
    D21,015.75
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  • 6623 ARC Billet Flywheel, GX340/390 Non-Adj.

    6623 ARC Billet Flywheel, GX340/390 Non-Adj.

    (1)

    SFI certified ARC Racing Electric Start flywheel for the Honda GX340 / GX390 / 420cc / 460cc engines. The keyway is fixed in the stock position of 24 degrees with a stock key. Will work with the stock pull rope. No coil bracket is required, uses the...
    D14,671.37
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  • 6623-E GX340/GX390 Electric/Pull Start Billet Flywheel

    6623-E GX340/GX390 Electric/Pull Start Billet Flywheel

    Can be used for electric or pull start! ARC Racing non-adjustable Billet SFI Certified flywheel for the Honda GX340 / GX390 / 420cc / 460cc engines is now both electric and pull start capable. The key way is fixed in the stock position of 24 degrees with...
    D18,636.60
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  • 6693 GX390 UT2 BILLET FLYWHEEL

    6693 GX390 UT2 BILLET FLYWHEEL

    ARC Racing Billet SFI Certified Flywheel for the Honda GX340 / GX390 / 420cc / 460cc engines. For use with the Honda UT2 style coil only. The keyway is fixed in the stock position with a stock key. Will work with the stock pull rope only.No coil...
    D14,671.37
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  • 6693-E GX390 UT2 Electric Start Billet Flywheel

    6693-E GX390 UT2 Electric Start Billet Flywheel

    Can be used for electric or pull start! ARC Racing non-adjustable Billet SFI Certified flywheel for the Honda GX340 / GX390 / 420cc / 460cc engines is now both electric and pull start capable. For use with the Honda UT2 style coil only. The...
    D18,636.60
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  • 6774 Honda GX340/390 4.51" Billet Rod

    6774 Honda GX340/390 4.51" Billet Rod

    (2)

    ARC billet +.100" long connecting rod for the Honda GX390-460cc clone engine. 4.510" center to center for a 1.416" crank pin and a .788" wrist bore. Manufactured from domestic 7075-T651 aluminum and uses 5/16" rod bolts designed and produced by ARP. Also...
    D11,891.74
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  • 6877 Pulse Inlet Fitting

    6877 Pulse Inlet Fitting

    (1)

    Pulse Inlet Fitting These fittings go in the clone valve cover in order to pulse the fuel pump. We sell the valve cover with the fitting already installed as well.
    D158.61
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  • 6888BK 3.5x4 Pre-Filter

    6888BK 3.5x4 Pre-Filter

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    A simple, inexpensive pre-filter that protects your engine without sacrificing horsepower. Clean with a mild detergent and water. Let air dry in the Sun  ***Do Not oil***
    D712.95
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  • 6889RD 3.5x5 Foam Pre-Filter

    6889RD 3.5x5 Foam Pre-Filter

    (1)

    Easy to clean washable foam Pre-Filter helps your filter do it's job in overly dusty conditions.  Wash with a mild detergent and water. Let air dry in the Sun.  
    D178.44
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  • 6899 Angled Air Filter

    6899 Angled Air Filter

    (5)

    The standard angled air filter used in most 4 cycle karting engines. 3-1/2" x 4" with a 20 degree angle. The inside diameter of the mounting flange is 2-7/16". Most OHV kart engines will require an angled air filter Wash with K&N filter cleaner or a...
    D871.56
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  • 6905 Red Fuel Line

    6905 Red Fuel Line

    (12)

    RED Fuel Line by the foot.Durable and PliableTo order, use Quantity to show how many feet of hose needed.  $0.65/foot
    D55.51
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Why Choose ARC Racing for Your Honda GX Series Parts?

ARC Racing is a trusted name in high-performance engine components, offering superior parts designed for maximum performance and longevity.

Designed for Maximum Performance and Longevity

Every component from ARC Racing is engineered to enhance performance while ensuring durability and reliability under extreme conditions.

Trusted by Racers and Enthusiasts Worldwide

Professional racers and hobbyists alike rely on ARC Racing parts for their GX390, GX420, GX460, and GX340 engines.

Superior Quality Control and Testing Standards

ARC Racing parts undergo rigorous testing to meet the highest industry standards, ensuring optimal performance and reliability.

FAQs

What Makes the Honda GX390 Ideal for High-Performance Applications?

The GX390’s robust design, high displacement, and availability of performance parts make it a top choice for racing and heavy-duty applications.

Can I Upgrade My Honda GX340 to GX390 or GX420 Parts?

Yes, many components from the GX390 and GX420 can be used to upgrade a GX340 for increased performance.

How Do I Maintain My Honda GX Engine After Upgrading?

Regular maintenance, including oil changes, air filter replacements, and proper tuning, will keep your upgraded Honda GX engine running at peak performance.

 

Contact ARC Racing for Expert Advice and Custom Solutions

Our team of experts is ready to assist you in selecting the best performance upgrades for your Honda GX engine.


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