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

Insulator gasket for Honda GX390 engines.

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.

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.

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

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

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

Foam pre-filter that fits our 500-1100 performance air filter.

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

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

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.

Insulator with pulse fitting for Honda GX390 engines.

• Engineered to meet or exceed OE designs and withstand the extreme operating temperatures experienced during a powersports engine's combustion
• Iridium-enhanced 0.6mm finewire design for improved ignitability, faster fuel combustion and a more focused ignition versus standard plugs
• Up to 26 percent quicker starts compared to that of standard plugs and as much as 21 percent less hydrocarbon emissions than standard plugs, which promotes better fuel efficiency and horsepower

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

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

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

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

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

Copper head gasket available in a variety of bore and thickness ranges for the big block Honda GX390, 460cc, 500cc engines.  Select the gasket below that fits your build:

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

Starter nut for Honda GX340, GX390 and many other big block clones including 420cc Predator, 440cc and 460cc clones.  Uses 3/4" socket drive on end to start engine.

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

Small engine racing air filter for use in many applications including go karts, mini bikes and many other off road applications.

This head gasket is a graphite head gasket and will fit the Honda GX390 engine with 88mm bore.