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Roller Rocker Arm Set 1.3 Ratio for Honda GX390 Roller Rocker Arm Set 1.3 Ratio for Honda GX390

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Carburetor, Bullfrog Accelerator Series Mikuni 32mm Carburetor, Bullfrog Accelerator Series Mikuni 32mm

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Stroker Crankshaft, 74mm Stroke Honda GX390 Stroker Crankshaft, 74mm Stroke Honda GX390

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ARP Side Cover Bolt for Honda GX390, GX440 ARP Side Cover Bolt for Honda GX390, GX440

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Carburetor, Mikuni 38mm Round Slide Carburetor, Mikuni 38mm Round Slide

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Intake Gasket for Honda GX390 Big Block Clone Intake Gasket for Honda GX390 Big Block Clone

Intake gasket for Honda GX340, GX390 and big block clone engines.

List Price: $2.24
Our Price: $1.95
Sale Price: $1.76
Savings: $0.48
Insulator Gasket for Honda GX390 Insulator Gasket for Honda GX390

Insulator gasket for Honda GX390 engines.

List Price: $3.74
Our Price: $3.25
Sale Price: $2.93
Savings: $0.81
Cylinder Head Dowel for Honda GX390, GX440 Cylinder Head Dowel for Honda GX390, GX440

Cylinder head dowel fits Honda GX340, GX390, 420cc, GX440 and 460cc big block clone engine.

Our Price: $4.00
Copper Exhaust Header Gasket for Honda GX390 Copper Exhaust Header Gasket for Honda GX390

Bullfrog Performance Products copper exhaust header gasket for Honda GX240, GX270, GX340, GX390, GX610, GX620 and GX690.  Will also fit Predator 420cc engines and many other big block clone engines.

Our Price: $5.00
Crankshaft Oil Seal for Honda GX390 Crankshaft Oil Seal for Honda GX390

Crankshaft oil seal fits Honda GX390 engines.  Our crankshaft oil seal is made from Viton material to withstand higher operating temperatures.  Use this seal on both the PTO or Flywheel side of the engine.  Engine requires two per engine so order a quantity of two per engine.

Our Price: $5.00
ARP Side Cover Bolt for Honda GX390, GX440 ARP Side Cover Bolt for Honda GX390, GX440

ARP crankcase side cover bolt fits Honda GX340, GX390, 420cc, GX440 and 460cc big block clone engines.  Order a total of 7 bolts for Honda GX340 and GX390.  Order a total of 10 bolts for GX440 and 460cc big block clone engines.

List Price: $7.98
Your Price $5.45
Savings: $2.53
Dipstick for Honda GX390, 460cc Big Block Dipstick for Honda GX390, 460cc Big Block

Dipstick fits Honda GX240, GX270, GX340, GX390, GX440 and 460cc big block engines.

Our Price: $6.00
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
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
Solid Side Cover Dowel Pin Kit for Honda GX390 (Includes 2 dowels) Solid Side Cover Dowel Pin Kit for Honda GX390 (Includes 2 dowels)

Solid side cover dowel pin fits Honda GX390 engines.  Order two per engine.

Our Price: $8.00
Foam Air Pre-Filter for Mikuni 38mm SBN Foam Air Pre-Filter for Mikuni 38mm SBN

Foam air pre-filter for our Mikuni 38mm Super BN air filter.

Our Price: $8.00
Insulator with Pulse Fitting for Honda GX390 Insulator with Pulse Fitting for Honda GX390

Insulator with pulse fitting for Honda GX390 engines.

List Price: $10.29
Our Price: $8.95
Sale Price: $8.06
Savings: $2.23
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
Header Flange, Honda GX390 Big Block Clone Header Flange, Honda GX390 Big Block Clone

Our exhaust header flange is 1/4" thick and CNC machined for the DIY person who needs to custom make an exhaust system.

List Price: $11.49
Our Price: $9.99
Sale Price: $8.99
Savings: $2.50
Header Flange for Honda GX390 Header Flange for Honda GX390

Bullfrog Performance Products header flange fits the Honda GX390 engines.  Great item for the DIY person who wants that custom header design.

Our Price: $9.00
ARP Head Bolt for Honda GX390, GX440 ARP Head Bolt for Honda GX390, GX440

ARP head bolt fits Honda GX340, GX390, GX440 and 460cc big block clone engines.  Order a total of 4 bolts for one engine.

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
Valve Lock Kit for Bullfrog Billet Retainers Honda GX390 Big Block Valve Lock Kit for Bullfrog Billet Retainers Honda GX390 Big Block

Bullfrog Performance Products set of valve locks for one complete Honda GX390 engine that fits our billet aluminum Honda GX390 aftermarket valve spring retainers.

List Price: $13.43
Our Price: $11.68
Sale Price: $10.51
Savings: $2.92
Klotz Nitro Power Additive Klotz Nitro Power Additive

Works with either gasoline or methanol fuels to increase horsepower and torque of modified engines.

List Price: $14.94
Our Price: $12.99
Sale Price: $11.69
Savings: $3.25
Air Pre-Filter Outerwears 3 1/2" ID Air Pre-Filter Outerwears 3 1/2" ID

Outerwears air pre-filter for our 500-1100 performance air filter.

Our Price: $11.95
Head Gasket fits Honda GX390 .010" Thick Head Gasket fits Honda GX390 .010" Thick

This head gasket fits Honda GX390 88mm bore and is .010" thick.

Our Price: $12.95
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