Engine, 460cc, 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 Europe.

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 with or without Electric Starter

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



Engine, 460cc, Chinese OHV, 25hp, Assembled with 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 Europe.

All Engines are test ran to ensure you dont receive a defective engine!

92mm Bore x 69mm Stroke = 458cc
246 Duration .260" Lift
4.45" Billet Connecting Rod w/Bearing Installed & Clearanced
Chrome moly Push rods Installed
35lb Heavy Duty Valve Springs Included
10.5:1 Compression (7cc Dished Piston)
0.020" MLS (Multi-Layer Steel) Head gasket Included - The strongest head gasket on the market!
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!
Insulator with Pulse Fitting Installed (No need to drill and tap your isolator to get engine vaccuum to your fuel pump!)
*Engine does not come with an electric-starter. Due to an elevated compression ratio,use of an electric start is not recommended.



Engine, Racing, Factory Stock - GX390

GX390 Race prepped including,

Open Element Air Filter Assembly,
Removal of governor,
HD Valve Springs,
Advanced Timing,
Rejetted carb
Digital Ignition w/o Rev Limiter

Options:

Billet Flywheel (includes old style coil)
Bored Carb
Billet Rod (due to lack of bearing, stock rods are prone to failure)

WARNING: TO PREVENT SERIOUS INJURY AN ALUMINUM FLYWHEEL SHOULD BE USED ON ALL MODIFIED MOTORS

Unless Stated, Engines do not come with Tank, Muffler/Exhaust, or Linkage. Picture is for reference only (fuel pump or mounting plate not included unless specified).

Engines are built to order and take approx 1 to 2 weeks to ship depending on season



Engine, Racing, Super Stock, Honda GX390

GX390 Race Engine including,

Open Element Air Filter Assembly,
Removal of governor,
HD Valve Springs,
Advanced Timing
Digital Ignition Coil w/o Rev Limiter
Race prepped & milled Head
3 angle Valve Job
Bored 390 carb,
Reinforced Rocker Arms
280 Lift Cam
Billet Rod
Test Run on Engine Stand

 

Options:

Billet Flywheel (includes old style coil)

WARNING: TO PREVENT SERIOUS INJURY AN ALUMINUM FLYWHEEL SHOULD BE USED ON ALL MODIFIED MOTORS

Unless Stated, Engines do not come with Tank, Muffler/Exhaust, or Linkage. Picture is for reference only (fuel pump or mounting plate not included unless specified).

Engines are built to order and take approx 2 to 3 weeks to ship depending on season



Engine, Racing, 420cc Chinese OHV, 34.83 hp, Modified READY TO SHIP

20cc (GX390 Type) Factory Stock Motor

420cc
ARC Billet Long Rod
Dual Springs
Open Element Air Filter
Billet Flywheel
34mm Mikuni
Fully Ported Head
Stainless Steel Valves
Re-jetted Stock Carb w/cable style linkage
307 Racing Cam
Chrome-moly Pushrods
11 to Compression (7cc Dished Piston)
1" Shaft with 1/4" Keyway
No Rev Limiter or Governor
Electric Start
Fully dyno'd and tested

34.83hp

37.76 lbs tq

Max RPM 7500

MOTORS SOLD FOR ORGANIZED COMPETITION PURPOSES OR EXPORT ONLY

Unless Stated, Engines do not come with Tank, Muffler/Exhaust, or Linkage. Picture is reference only



Engine, Racing, Limited Mod, Honda GX390

GX390 Race Engine including,

Open Element Air Filter Assembly,
Removal of governor,
Advanced Timing,
Reinforced Rocker Arms
Billet Rod
Billet Flywheel|
Coil w/o Rev Limiter
Full Ported & milled Head,
SS Valves (OS on intake)
Aluminum Retainers & keepers
Dual Springs (Single with TQ cams)
Billet 1.23 Rocker Arms
Choice of cams
Chrome Moly Pushrods
Stud Kit
Choice of Max Bored Carb or optional Mikunis
Test Run on Engine Stand

Options

Roller Rockers
Mikuni Carbs
Choice of cams
Small Diameter Flywheel

Unless Stated, Engines do not come with Tank, Muffler/Exhaust, or Linkage. Picture is reference only

Engines are built to order and take approx 3 to 4 weeks to ship depending on season