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Main Jet Performance Upgrade Kit For GX390 and Predator 420cc Main Jet Performance Upgrade Kit For GX390 and Predator 420cc

Our main jet kit is a must for the Honda GX390, Predator 420cc engines that have had the performance K&N style air filter setup installed on the engine. Maximizes the engine for best performance and air fuel ratio.

Our Price: $8.14
Air Filter Adapter for Mikuni 38mm Super BN Carburetor Air Filter Adapter for Mikuni 38mm Super BN Carburetor

Bullfrog Performance Products air filter adapter for Mikuni 38mm Super BN carburetor.

List Price: $38.95
Your Price $27.50
Sale Price: $19.95
Savings: $19.00
Bracket, Fuel Tank Mount for 460cc 10 Bolt Block Bracket, Fuel Tank Mount for 460cc 10 Bolt Block

Fuel tank mounting bracket for top of 460cc 10 bolt block

Our Price: $28.95
Cylinder Deck Spacer 1/2" Thick Big Block Cylinder Deck Spacer 1/2" Thick Big Block

Bullfrog Performance Products cylinder deck spacer fits 460cc big blocks with 92mm bore x 1/2" thick and is used to increase the deck height of the cylinder block.  It is preferred to weld our spacer onto your block and re-sleeve the cylinder for best results.

List Price: $43.47
Our Price: $37.80
Sale Price: $34.02
Savings: $9.45
Cylinder Deck Spacer 1/4" Thick Big Block Cylinder Deck Spacer 1/4" Thick Big Block

Bullfrog Performance Products cylinder deck spacer fits 460cc big blocks with 92mm bore x 1/4" thick and is used to increase the deck height of the cylinder block.  It is preferred to weld our spacer onto your block and re-sleeve the cylinder for best results.

List Price: $43.47
Our Price: $37.80
Sale Price: $34.02
Savings: $9.45
Bullfrog Pro Velocity High Performance Air Filter Kit for Honda GX390 Bullfrog Pro Velocity High Performance Air Filter Kit for Honda GX390

Our Pro Velocity high performance air filter kit fits Honda GX340, GX390, Predator 420cc and 460cc big block clone engines. Upgrade your go kart, mini bike or drift trike with our high performance air filter kit. Our kit includes the following items:


  • High flow racing style air filter 4" filter length
  • Foam Pre-Filter
  • Radiused air filter adapter
  • Choke hold bracket

Our Price: $44.95
Side Cover, 10 Bolt Side Cover for 460cc Engines Side Cover, 10 Bolt Side Cover for 460cc Engines

10 bolt side cover for 460cc big block clone engines.

List Price: $57.44
Our Price: $49.95
Sale Price: $44.96
Savings: $12.48
Mud Motor Exhaust Header for Honda GX390, Predator 420cc Big Blocks Mud Motor Exhaust Header for Honda GX390, Predator 420cc Big Blocks

Long tube loop exhaust header for the Honda GX340, GX390, 420cc Predator, 460cc big block clone engine for mud motor boat application. Header pipe give your engine more low to mid range torque specifically for mud motor boats.

Our Price: $69.95
Cylinder Block, 460cc 10 Bolt 92mm Bore Cylinder Block, 460cc 10 Bolt 92mm Bore

Bullfrog Performance Products 92mm 460cc cylinder block.  Our block features a 10 bolt side cover and a tall deck to allow for even more stroke without the piston popping up above the deck.  Our cylinder block accepts all Honda GX390 internals, including camshaft, lifters and cranks seals.

List Price: $120.69
Our Price: $104.95
Sale Price: $94.46
Savings: $26.23
Titanium Exhaust Valve 6mm Stem, 35mm O.D., 3.650" Length Titanium Exhaust Valve 6mm Stem, 35mm O.D., 3.650" Length

Titanium Exhaust valve for the Honda GX340, GX390, 460cc big block engines. Our titanium exhaust valve has a 35mm diameter head with 6mm diameter stem and is 3.650" overall length. This valve is also DLC coated to prevent wear between guide and seat contact area.
Limited quantity available so get this valve while it is available!

Our Price: $100.00
Titanium Exhaust Valve 6mm Stem, 45mm O.D., 3.650" Length Titanium Exhaust Valve 6mm Stem, 45mm O.D., 3.650" Length

Titanium Exhaust valve for the Honda GX340, GX390, 460cc big block engines. Our titanium exhaust valve has a 45mm diameter head with 6mm diameter stem and is 3.650" overall length. This valve is also DLC coated to prevent wear between guide and seat contact area.
Limited quantity available so get this valve while it is available!

Our Price: $100.00
Side Cover, Billet 10 Bolt Side Cover for 460cc Engines Side Cover, Billet 10 Bolt Side Cover for 460cc Engines

Billet 10 bolt side cover for 460cc big block clone engines.

Our Price: $189.95