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Briggs & Stratton Animal Predator 212cc Honda GX390, Predator 420cc, 460cc
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Cylinder Head Dowel, Honda GX390 Cylinder Head Dowel, Honda GX390

Cylinder head dowel for Honda GX240, GX270, GX340 and GX390 engines.

Our Price: $3.25
Oil Drain Plug, Honda GX390 Oil Drain Plug, Honda GX390

Oil drain plug for Honda GX240, GX270, GX340 and GX390 engines.

Our Price: $3.95
Solid Side Cover Dowel Pin for Honda GX390 - Short Solid Side Cover Dowel Pin for Honda GX390 - Short

Solid side cover dowel pin fits Honda GX390 engines.  Short version when using the Bad Ass Minis 500cc cylinder blocks.  Sold per dowel pin

Our Price: $5.95
Solid Side Cover Dowel Pin for Honda GX390 - Std Length Solid Side Cover Dowel Pin for Honda GX390 - Std Length

Solid side cover dowel pin fits Honda GX390 engines. Standard length version.  Sold per dowel pin

Our Price: $5.95
Oil Fill Plug for Honda GX390, 460cc Big Block Oil Fill Plug for Honda GX390, 460cc Big Block

Oil fill plug fits Honda GX240, GX270, GX340, GX390, 440cc and 460cc big block engine.

Our Price: $6.00
Crankshaft Oil Seal for Honda GX390 Crankshaft Oil Seal for Honda GX390

Crankshaft oil seal fits Honda GX340, GX390, 420cc and 460cc engines.  Use this seal on both the PTO or Flywheel side.  Engine requires two per engine so order a quantity of two per engine.

Our Price: $6.25
Valve Lock Set, Split Locks GX390 Valve Lock Set, Split Locks GX390

Valve lock set for Bad Ass Minis GX390 stainless steel valves.

Our Price: $6.95
Bronze Valve Guide, 6.5mm Honda GX390 Bronze Valve Guide, 6.5mm Honda GX390

Bullfrog Performance Products bronze valve guide set will fit the Honda GX340, GX390 and many other big block clone engines with factory diameter valve stem size of 6.5mm. Our bronze valve guide will outperform in longevity and performance over the factory steel guide. Has closer to the same heat expansion rate as aluminum head for a more stabil valvetrain operation. These are sold per valve guide so order two for replacing guides in head intake and exhaust!

Our Price: $7.39
Air Filter, Angled 4" Long x 2 7/16" ID Air Filter, Angled 4" Long x 2 7/16" ID

Small engine racing air filter for use in many applications including go karts, mini bikes and many other off road applications.
Aftermarket air filter for the Predator 212cc, Honda GX390, Clone engines when using our air filter adapters with 2 7/16" OD. This air filter is an aftermarket version of the K&N cotton gauze design. Be sure not to forget our air filter oils and cleaners to keep your air filter performing at its best.

Our Price: $9.95
Side Cover Gasket, 7 Bolt Side Cover Honda GX390, 420cc Big Block Side Cover Gasket, 7 Bolt Side Cover Honda GX390, 420cc Big Block

Honda GX390 side cover gasket.  Fits all 7 bolt GX390 engines and 7 bolt 420cc big block engines.

Our Price: $10.00
Air Filter, 15 Degree Angled 6" Length x 2 7/16" ID Air Filter, 15 Degree Angled 6" Length x 2 7/16" ID

Performance air filter that fits Predator 212cc, Clone and Big Block applications with an air filter adapter with 2 7/16" diameter adapter.

Our Price: $12.95
Honda GX390 OEM Lifter Honda GX390 OEM Lifter

Honda GX340, GX390 OEM lifter (sold per lifter, order two for complete engine).

Our Price: $14.95
Side Cover Gasket, 10 Bolt 460cc Big Block Side Cover Gasket, 10 Bolt 460cc Big Block

10 bolt side cover gasket for the 440cc and 460cc 10 bolt side cover

Our Price: $14.95
Dual Valve Spring Kit for Honda GX390 65 lbs Dual Valve Spring Kit for Honda GX390 65 lbs

Bad Ass Minis 65 lb. dual valve spring kit for the Honda GX390  big block single cylinder racing engines.  We highly recommend our 65 lb. kit when using any cams with .300" lift and higher.

Our Price: $15.95
Connecting Rod Bolt Set, ARP Rod Bolt Kit for GX390 Billet Rods Connecting Rod Bolt Set, ARP Rod Bolt Kit for GX390 Billet Rods

Connecting rod bolt set for ARC Racing billet Honda GX390 connecting rods.

Our Price: $17.95
Valve Spring Kit, Single Honda GX390 35 lb. Valve Spring Kit, Single Honda GX390 35 lb.

Valve spring kit for Honda GX390.  This is a set of single wound valve springs rated at 35 lbs.

Our Price: $18.95
Main Bearing for Honda GX390, 420cc, 460cc Main Bearing for Honda GX390, 420cc, 460cc

Main bearing for Honda GX340, GX390, 420cc and 460cc engines.   Requires two per engine.  (These are sold individually one bearing).

Our Price: $19.00
Rod Bearing Set for Honda GX390 Billet Connecting Rods Rod Bearing Set for Honda GX390 Billet Connecting Rods

ARC Racing connecting rod bearing set for ARC Racing and Bad Ass Minis billet GX390 connecting rods.

Our Price: $23.00
96mm Head Gasket for Big Block Engine (No Oil Feed Hole) 96mm Head Gasket for Big Block Engine (No Oil Feed Hole)

Bad Ass Minis performance head gasket specifically designed for Bad Ass Minis big bore 95mm cylinder blocks. This head gasket fits 96mm bore big blocks and is Made In USA!. This head gasket has a 96mm bore and is .043" thick and does not have the oil feed hole made into gasket.

Our Price: $24.95
40mm Stainless Steel Intake Valve for Honda GX390, 460cc Big Block 40mm Stainless Steel Intake Valve for Honda GX390, 460cc Big Block

Bad Ass Minis stainless steel intake valve fits Honda GX390, 460cc engines. 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: $31.99
33mm Stainless Steel Exhaust Valve for Honda GX390, 460cc Big Block 33mm Stainless Steel Exhaust Valve for Honda GX390, 460cc Big Block

Bad Ass Minis stainless steel exhaust valve fits Honda GX390, 460cc engines. 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: $31.99
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
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
Crankshaft, 69mm Stroke GX390 Crankshaft, 69mm Stroke GX390

69mm stroker crankshaft for big block 460cc engines. Can be used in Honda GX390, but you may have to mill your piston to fit the Honda GX390 block.

Our Price: $98.00
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
Billet Connecting Rod ARC Racing for Honda GX390 4.410" Billet Connecting Rod ARC Racing for Honda GX390 4.410"

ARC Racing billet connecting rod for Honda GX390 engines.  Includes rod bearings and rod bolts.

Our Price: $150.00
Billet Connecting Rod ARC Racing for Honda GX390 4.450" Billet Connecting Rod ARC Racing for Honda GX390 4.450"

ARC Racing billet connecting rod for the Honda GX390.  This rod is 4.450" center to center length and comes with rod bearings and rod bolts.

Our Price: $150.00