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25HP 460cc Go-Kart & Golf Cart Racing Engine - Assembled w/Billet Rod

25HP 460cc Go-Kart & Golf Cart Racing Engine - Assembled w/Billet Rod

These Built engines are custom made to our specifications and are the only 458cc Honda GX390 "big bore clones" available for purchase in the United States.

Finish Machined & Assembled in Las Vegas, NV...All Engines are test ran to ensure you dont receive a defective engine!

  • 92mm Bore x 69mm Stroke = 458cc
  • 246 Duration .260" Lift Custom Camshaft
  • Lightweight Flat-Top Piston
  • 4.51" Billet 7075 Aluminum Connecting Rod w/Bearing
  • Chromoly Pushrods
  • 35lb Heavy Duty Valve Springs
  • 10:1 Compression
  • 0.026" MLS (Multi-Layer Steel) Headgasket Included - The strongest headgasket on the market!
  • Deck Height = 6.890"
  • Adjustable Tuned Carb Included
  • 1" Shaft with 1/4" Keyway
  • No Rev Limiter or Governor
  • Heavy Duty 10-Bolt Engine Block (Modified Extra-Thick & Reinforced Casting) - The strongest clone engine block on the market!
  • Isolator with Pulse Fitting Installed (No need to drill and tap your isolator to get engine vaccuum to your fuel pump!)
  • 90 Day Warranty (When used in a standard golf cart or go kart racing application!) - Click here for Warranty Info
  • 57Lbs Shipping Weight

Our Price: $599.99
460cc Go Kart Racing Engine - Barebones Builder Kit

460cc Go Kart Racing Engine - Barebones Builder Kit

These engines are custom made to our specifications and are the only 458cc Honda GX390 "big bore clones" available for purchase in the United States.

This kit doesn't include Piston, rings, rod, cam, valvetrain, pull starter or balance shaft. If you need those pieces, we do sell them individually.

  • Heavy Duty 10-Bolt Engine Block (Modified Extra-Thick & Reinforced Casting) - The strongest clone engine block on the market!
  • 92mm Bore x 69mm Stroke
  • Uses all GX390 Performance Parts (Cams, Valvetrain, etc)
  • Available WITHOUT Electric Starter ONLY

The builder kits are designed for those who are experienced builders/racers and/or building an open motor in which many of the stock components will not be used.

Why throw away the stock parts when you dont have to buy them in the first place??? Our builder kit includes the following:

  • 1 - 92mm Crankcase w/Removable Electric Starter Cover
  • 1 - 10-Bolt Side Cover
  • 1 - 69mm Crankshaft w/1" PTO
  • 1 - Bare Cylinder Head
  • 1 - MLS Headgasket
  • 1 - Valve Cover w/Bolt
  • 2 - Lifters
  • 1 - Ignition Coil
  • 1 - Fan Shroud w/Aluminum Recoil Cover
  • 1 - Billet 32mm Intake Manifold
  • 1 - Set of Gaskets, Seals & Bolts

*4.51" Rods are ONLY compatible with the Flat-Top Cast Piston

*4.45" Rods are ONLY compatible with the Forged Pistons

Our Price: $249.99
Freshen Up / Rebuild Kit for VRX460 & 440cc Clones - 92mm Piston

Freshen Up / Rebuild Kit for VRX460 & 440cc Clones - 92mm Piston

This kit includes the most common parts needed to refresh/rebuild one of our 460cc or 440cc Clone engines with a 92mm Piston:

  • (1) MLS Headgasket
  • (1) Set of 92mm Piston Rings
  • (1) Set of Rod Bearings
  • (1) Side Cover Gasket
  • (2) Crankshaft Oil Seals
  • (1) Valve Stem Seal
  • (1) Intake Valve
  • (1) Exhaust Valve
  • (1) Set of Valve Springs
  • (1) Set of Intake Gaskets
  • (1) Exhaust Gasket

Our Price: $99.99
460cc Bare Engine Block / Crankcase

460cc Bare Engine Block / Crankcase

Our exclusive Heavy Duty 10-Bolt Crankcase that come OEM on our VX460 Engines.

The strongest clone engine block on the market!

No Side Cover, Bearings, Seals or Gaskets Included.

Pre-Clearanced for a Billet Rod & 69mm Stroker Crankshaft!

Our Price: $99.99
69mm Stroker Crankshaft for GX340/GX390 & 420/440 Clones

69mm Stroker Crankshaft for GX340/GX390 & 420/440 Clones

OEM Crankshaft on our 460cc engine.

Our Exclusive 69mm Stroker Crank. Bolt it to a Honda GX340, GX390 or any of the 420 & 440 Clones. Turn a 440 into a 460! (ADVANCED ENGINE BUILDERS ONLY!)

Bearing included!.

Our Price: $59.99
Cylinder Head OEM Cylinder Head for RX460 - Milled

OEM Cylinder Head for RX460 - Milled

Bare OEM Cylinder head for our 460cc engines.

  • Milled .050" (10.5:1 Compression)
  • Uses 36mm Intake / 31mm Exhaust Valve
  • 6.5mm Guides Installed

Our Price: $49.99
Cylinder Head OEM Cylinder Head for GX390/Clone

OEM Cylinder Head for GX390/Clone

Bare OEM Cylinder head for our 440cc clone engines. Can also be used on GX340/390/420

  • 41cc Combustion chamber (w/Stock Valves)
  • Extra-Thick Deck (Safely mill off .150"+)
  • Uses 36mm Intake / 31mm Exhaust Valve
  • 6.5mm Guides Installed

Our Price: $36.99
460cc Bare Side Cover

460cc Bare Side Cover

Our exclusive Heavy Duty 10-Bolt Crankcase Side Cover that comes OEM on our VX460 Engines.

No Bearings, Seals or Gaskets Included.

Our Price: $34.99
High-Flow Low Profile Air Filter/Box

High-Flow Low Profile Air Filter/Box

This airbox has been modified to flow the maximum amount of air and still maintain the OEM look and filtration.

It is ultra low profile for Golf Cart swaps with limited space such as the Yamaha G2, G16 and EZGO TXT.

Dyno Proven to make equivalent power to our Billet Velocity Stacks when using the OEM Carburetor.

OEM Air Box on our 460cc Engines.

**REQUIRES 106mm Carb Studs!

DOES NOT FIT MAXTOOL DUROMAX ENGINES!!

Our Price: $29.99
92mm Flat-Top Piston for GX390/Clone

92mm Flat-Top Piston for GX390/Clone

This is the OEM Flat-Top Piston in our 460cc engines equipped with the 4.51" Connecting Rod .92mm Diameter

Wrist Pin & Locks Included

Will also fit 440cc engines with a 4.51" Connecting Rod

GX390s & 420s will need to be bored out!

Our Price: $24.99
OEM Recoil/Pull Starter

OEM Recoil/Pull Starter

The OEM Recoil Starter for our GX460 Clones. They will also fit the GX340, GX390 & GX420 / GX440 Clones.

Our Price: $24.99
OEM Flywheel w/Ring Gear for GX390 & 420cc - 460cc Clone

OEM Flywheel w/Ring Gear for GX390 & 420cc - 460cc Clone

OEM Flywheel w/Ring Gear for GX390, 420cc , 440cc and 460cc Clone Engines

Our Price: $24.99
Camshaft OEM Camshaft for GX390/Clone, 420cc, 440cc

OEM Camshaft for GX390/Clone, 420cc, 440cc

This is the OEM Camshaft in our GX440 Clone Engines. It also fits all GX340/GX390s & Most GX420 Clones.

  • Intake Duration : ~ 220* @ .050" Lift
  • Exhaust Duration : ~ 210* @ .050" Lift
  • Intake Lift : ~ .260"
  • Exhaust Lift : ~.240"
  • 110 LSA

Our Price: $19.99
OEM Valves for our 460cc Engine

OEM Valves for our 460cc Engine


OEM Intake & Exhaust Valve on our 460cc Racing Engines.


36mm Intake, 31mm Exhaust - Stainless with Hardened Tips


Good to .360" Lift


Uses "Slip-Lock" Retainers

Our Price: $14.99
OEM Balancer Shaft for GX390/Clone

OEM Balancer Shaft for GX390/Clone

This is the OEM Balance Shaft in our 460cc engines. It will also fit the GX340, GX390 & 420/440cc Clones

Pre-Clearanced for a Billet Rod & 69mm Stroker Crankshaft!

Our Price: $14.99
OEM Ignition Coil for GX390 & 420/440/460 Clones

OEM Ignition Coil for GX390 & 420/440/460 Clones

The OEM Ignition Coil on our 440cc & 460cc Clones. It will also fit a GX340, GX390 & the 420cc Clones.

Kill wire & Spark Plug boot included

Our Price: $14.99
OEM Piston Rings for GX440 Clone - 92mm

OEM Piston Rings for GX440 Clone - 92mm

OEM Piston Ring set for our 440cc Clone Engines.

92mm Bore

File-Fit Recommended

Honing of the cylinder to break the glaze recommended before installation!

Our Price: $14.99
OEM Lifters for GX390/Clone

OEM Lifters for GX390/Clone

OEM Lifters on our 460cc Engines. Will also fit the GX340, GX390 & 420/440cc clones

Our Price: $14.90
Fan Shroud for GX390/Clone - Black

Fan Shroud for GX390/Clone - Black

OEM Fan Shroud on our 460cc Engines. Will also fit the GX340, GX390 & 420/440cc clones

Our Price: $12.99
Composite Headgasket - .060"

Composite Headgasket - .060"

94mm Diameter

.060" Thickness

**Not Re-Usable**

Our Price: $9.99
OEM Crankshaft Bearing for GX390/Clone

OEM Crankshaft Bearing for GX390/Clone


This is the OEM Crankshaft bearing in our 460cc engines. It will also fit the GX340, GX390 & 420/440cc Clones

Our Price: $9.99
Rocker Arms & Studs (Set of 2)

Rocker Arms & Studs (Set of 2)

Set of (2) Rocker Arms with Studs & Hardware. Compatible with GX340/GX390 & Clones

Our Price: $9.99
Valve Cover for GX390/Clone

Valve Cover for GX390/Clone


OEM Valve Cover on our 440cc Clone Engines.


Oil Seal Included.


Bolt not Included.

Our Price: $9.99
Multi-Layer Steel Headgasket - .020" - GX390 & Clones

Multi-Layer Steel Headgasket - .020" - GX390 & Clones

Multi Layer Steel Performance Headgasket for our GX440 Clone engines.

  • 94mm Diameter
  • .020" Compressed Thickness
  • OEM on our 460cc Engines

Our Price: $9.99
Composite Headgasket - .045"

Composite Headgasket - .045"

94mm Diameter

.045" Thickness

**Not Re-Usable**

Our Price: $9.99
Side Cover Gasket - 10 Bolt

Side Cover Gasket - 10 Bolt

  • OEM Crankcase Side Cover Gasket
  • 10-Bolt Style exclusive to our 440cc Engines
  • Will NOT fit 7-bolt blocks!

 

Our Price: $9.99
Isolator w/Pulse Fitting

Isolator w/Pulse Fitting


Need to get engine pulse to run your fuel pump? Dont want to mess with drilling and tapping your isolator or valve cover? This part is for you!


Most people that try to drill and tap these on their own end up breaking them, avoid the hassle and buy it once.

Our Price: $7.99
Intake Gaskets for GX340/GX390 & Clones

Intake Gaskets for GX340/GX390 & Clones

Includes 3 OEM Intake Gaskets (2pc Cylinder Head to Isolator & Carb & 1pc Carb to Airbox)

Fits all GX390s and Clones

Our Price: $6.00
Starter Hole BlockOff Plate

Starter Hole BlockOff Plate

OEM Starter Hole BlockOff Plate for our GX440 Clones.

All GX440 Clones come with Electric Start Crankcases so the Recoil Start versions can be converted to Electric Start at anytime.

Our Price: $5.00
Crankshaft Oil Seal for GX390/Clone Crankshaft Oil Seal for GX390/Clone

Crankshaft Oil Seal for GX390/Clone

OEM Crankshaft Oil Seal on our GX440 Clones
Also fits GX340, GX390 & GX420 Clones

Our Price: $5.00