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Fuel Filter, 90 Degree 1/4" OD Barbs Fuel Filter, 90 Degree 1/4" OD Barbs

Fuel Filter, 90 Degree 1/4" OD Barbs. Fits 1/4" ID fuel line

Our Price: $6.10
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
Fuel Filter, Stainless Steel Element 1/4" Barbs Red Color Fuel Filter, Stainless Steel Element 1/4" Barbs Red Color

Fuel Filter that has a Stainless Steel Element with 1/4" Barbs to fit 1/4" ID fuel line. Red Color

Our Price: $8.30
Fuel Filter, Stainless Steel Element 1/4" Barbs Green Color Fuel Filter, Stainless Steel Element 1/4" Barbs Green Color

Fuel Filter that has a Stainless Steel Element with 1/4" Barbs to fit 1/4" ID fuel line. Green Color

Our Price: $8.30
Fuel Filter, Stainless Steel Element 1/4" Barbs Blue Color Fuel Filter, Stainless Steel Element 1/4" Barbs Blue Color

Fuel Filter that has a Stainless Steel Element with 1/4" Barbs to fit 1/4" ID fuel line. Blue Color

Our Price: $8.30
Fuel Filter, 90 Degree 1/4" OD Barbs (Pack of 3) Fuel Filter, 90 Degree 1/4" OD Barbs (Pack of 3)

Fuel Filter, 90 Degree 1/4" OD Barbs. Fits 1/4" ID fuel line. Pack of 3 filters!

Our Price: $12.95
Fuel Filter, Stainless Steel Element 1/4" Barbs Red Color (2 Pack) Fuel Filter, Stainless Steel Element 1/4" Barbs Red Color (2 Pack)

Fuel Filter that has a Stainless Steel Element with 1/4" Barbs to fit 1/4" ID fuel line. Red Color (sold as a pair)
Save $$$'s with this 2 pack vs. buying in singles!

Our Price: $15.95
Fuel Filter, Stainless Steel Element 1/4" Barbs Green Color (2 Pack) Fuel Filter, Stainless Steel Element 1/4" Barbs Green Color (2 Pack)

Fuel Filter that has a Stainless Steel Element with 1/4" Barbs to fit 1/4" ID fuel line. Green Color

Pack of 2 fuel filters!

Save $$$'s with our 2 pack vs. buying individually!

Our Price: $15.95
Fuel Filter, Stainless Steel Element 1/4" Barbs Blue Color 2 Pack Fuel Filter, Stainless Steel Element 1/4" Barbs Blue Color 2 Pack

Fuel Filter that has a Stainless Steel Element with 1/4" Barbs to fit 1/4" ID fuel line. Blue Color

Pack of 2 filters!

Save $$$'s with our pack of 2 filters vs. buying individually!

Our Price: $15.95
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
Head Gasket Fits GX440 and 460cc Engines 92mm Bore MLS Head Gasket Fits GX440 and 460cc Engines 92mm Bore MLS

Our Multi Layer Steel (MLS) head gasket fits the 440cc and 460cc big block clone engines with 92mm bore size.

Our Price: $20.00
Stainless Steel Intake Valve for 460cc, 40mm Head Stainless Steel Intake Valve for 460cc, 40mm Head

Bullfrog Performance Products stainless steel intake valve fits 460cc big block engines when cylinder head is machined for this valve size. We offer cylinder head machining to install this larger valve into the 460cc cylinder head. The valve head diameter is 40mm, which is 5mm larger than the stock 460cc valve. We highly recommend this valve when using high lift aftermarket racing cams to prevent valvetrain failure.
Be sure to include our billet aluminum or titanium valve spring retainer kit with our valve.

Our Price: $20.00
Stainless Steel Exhaust Valve 33mm Head Diameter GX390 Stainless Steel Exhaust Valve 33mm Head Diameter GX390

Bullfrog Performance Products stainless steel exhaust valve for Honda GX390 engines when valve seat is machined to 33mm valve head diameter. We offer cylinder head machining services to install our 33mm exhaust valve in your cylinder head.
We highly recommend this valve when using high lift aftermarket racing cams to prevent valvetrain failure.
Head Diameter = 33mm
Valve Overall Length = 3.650"
Tip Length = .130"

Be sure to purchase our titanium retainer kit or billet aluminum retainer kit to work with this valve!

Our Price: $20.00
Stainless Steel Intake Valve for Honda GX390, 36mm Head Stainless Steel Intake Valve for Honda GX390, 36mm Head

Bullfrog Performance Products stainless steel intake valve for Honda GX390 big block engines. This valve has 36mm head diameter. We do offer multi angle valve seat machining to get the most flow from this 36mm valve. We highly recommend this valve when using high lift aftermarket racing cams to prevent valvetrain failure.
This valve will give you the required valve spring installed height to get proper spring rate and coil bind clearance when using high lift aftermarket camshafts.

Our Price: $25.00
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
Header Kit, GX390 Mud Motor Header w/Muffler Straight Header Kit, GX390 Mud Motor Header w/Muffler Straight

Mud Boat header kit that fits the big block Honda GX240, GX270, GX340, GX390, Predator 420cc and 460cc engines. Our header kit features 1 1/4" O.D. header tube and is TIG welded for best durability. Our header kit includes the following components:

  • Straight header tube to fit mud motor specifically
  • Our custom TIG welded header flange
  • Screw on muffler

Our Price: $36.00
Header Kit, GX390 Mud Motor Header w/Muffler Angled Header Kit, GX390 Mud Motor Header w/Muffler Angled

Mud Boat header kit that fits the big block Honda GX240, GX270, GX340, GX390, Predator 420cc and 460cc engines. Our header kit features 1 1/4" O.D. header tube and is TIG welded for best durability. Our header kit includes the following components:

  • Header
  • Our custom TIG welded header flange
  • Screw on muffler

Our Price: $38.00
Titanium Valve Spring Retainer Kit Honda GX390 Big Block Titanium Valve Spring Retainer Kit Honda GX390 Big Block

Titanium valve spring retainer kit that fits the big block Honda GX240, GX270, GX340, GX390, 420cc Predator (non-hemi), 460cc Vegas Carts engine (equipped with our stainless steel valves). This titanium valve spring retainer kit includes (2) titanium valve spring retainers and a set of our automotive bead lock style valve locks. Our retainers will fit the single or dual springs out on the market and we also carry them in stock at Bullfrog Performance Products warehouse.

Our Price: $40.00
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
Pushrod Kit, Chrome Moly Big Block 6.5" Length x 5/16" OD x 6mm Ball Ends Pushrod Kit, Chrome Moly Big Block 6.5" Length x 5/16" OD x 6mm Ball Ends

Our chrome moly pushrod kit consists of two chrome moly pushrods that fit the big block Honda GX390 style engines.  Our pushrods measure 6.5" in length and are 5/16" OD with 6mm ball ends (factory ball end size).  These pushrods come assembled ready to drop in your big block clone or Honda GX390 racing engine.

Our Price: $45.00
Stainless Steel Valve and Titanium Retainer Kit GX390 Stainless Steel Valve and Titanium Retainer Kit GX390

Our big valve kit for the Honda GX340 / GX390 includes the following components:


  • 40mm head stainless steel intake valve 3.650" length
  • 33mm head stainless steel exhaust valve 3.650" length
  • Titanium valve spring retainers
  • Automotive bead lock style valve locks
Our kit does require your head to be machined to fit these valve head sizes. We do offer cylinder head machining at our facility and can machine your cylinder head or purchase a fully machined cylinder head from us ready to go.

Our Price: $60.00
Engine Mount, 440cc & 460cc Big Block, Top Mount Engine Mount, 440cc & 460cc Big Block, Top Mount

Bullfrog Performance Products big block engine mount plate will fit 440cc & 460cc engine base plate dimensions that are longer than the Honda GX390.  Machined from billet aluminum and ready to bolt to a Burris Racing BMC541 or BMC542 chassis mounts and many other Burris Racing kart chassis mounts.

Our Price: $65.00
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: $75.00
Hot Coil for Honda GX390 Big Block Clone-Black Wire Color Hot Coil for Honda GX390 Big Block Clone-Black Wire Color

Bullfrog Performance Products Hot Coil is designed for the Honda GX340, GX390 and Big Block Clone racing engines that need that hotter spark for your racing engine.  Our coil and wire package has a built-in capacitor that boosts the spark at your plug for increased throttle response and power!

Our Price: $78.00
Hot Coil for Honda GX390 Big Block Clone-Blue Wire Color Hot Coil for Honda GX390 Big Block Clone-Blue Wire Color

Bullfrog Performance Products Hot Coil is designed for the Honda GX340, GX390 and Big Block Clone racing engines that need that hotter spark for your racing engine.  Our coil and wire package has a built-in capacitor that boosts the spark at your plug for increased throttle response and power!

Our Price: $78.00
Hot Coil for Honda GX390 Big Block Clone-Red Wire Color Hot Coil for Honda GX390 Big Block Clone-Red Wire Color

Bullfrog Performance Products Hot Coil is designed for the Honda GX340, GX390 and Big Block Clone racing engines that need that hotter spark for your racing engine.  Our coil and wire package has a built-in capacitor that boosts the spark at your plug for increased throttle response and power!

Our Price: $78.00
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.

Our Price: $130.00
Billet Valve Cover, Honda GX390 Big Block w/Cooling Fins Billet Valve Cover, Honda GX390 Big Block w/Cooling Fins

Our billet valve cover for the big block engine features our unique integral cooling fins for additional valve spring chamber cooling. Our billet valve cover is the lightest cover on the market. You can throw away your stock valve cover gasket as our cover comes with an o-ring seal that promotes better clamping force and eliminates oil leaks. The other billet valve covers on the market do not have the machining time put into their valve cover to make them work as a bolt on piece. Our cover is taller than the factory valve cover so it will clear any roller rocker arm on the market. You will also receive our custom machined aluminum crankcase breather fittings.

Bullfrog Performance Products billet valve cover fits big block engines listed below:

  • Honda GX240
  • Honda GX270
  • Honda GX340
  • Honda GX390
  • Powerhorse 414cc
  • Vegas Carts 460cc
  • LCT 414cc
Our big block billet valve cover will only fit the wedge style head and it will not fit the hemi heads on Predator 420cc.

Our Price: $145.00