GX340 & GX390 PERFORMANCE PARTS

	Air Filter Adapter, 390 Price: $21.00 Quantity in Basket: none
Air filter Adapter fits GX390 & GX340. Precision CNC machined from billet aluminum. Incorporates venturi design. Accepts filter with a 2 7/16" ID.
	Air Filter Adaptor & Air Filter Price: $33.00 Quantity in Basket: none
Air filter adaptor with air filter. Our air filter adaptor is made from billet aluminum and incorporates a venturi design. The UNI filter is a dual layer, foam filter. This is a great washable filter suitable for all racers.
	Main Jet, 390 Price: $6.00 Quantity in Basket: none
Choose from the following main jets for the stock GX390 carburetor: 100, 102, 105, 108, 110, 112, 115 & 118
	Carburetor, GX390 Bored .925" Price: $99.00 Quantity in Basket: none
GX390 carburetor bored to .925". Idle circuitry reworked. Great carb for GX390's needing more power.
	Carb Insulator w/Vacuum Takeoff Price: $10.00 Quantity in Basket: none
Replaces stock carb insulator. Use the vacuum takeoff to run a fuel pump.
	Carburetor Adaptor With Pulse Fitting Price: $29.00 Quantity in Basket: none
Carburetor adapter with pulse fitting. Precision CNC machined from billet aluminum. Very light weight. A section of hose is needed to attach carb (not included). Adapter is 2" in length. Hose mounting surface has a 1 9/16" OD. Drilled and tapped for a pulse fitting to run your fuel pump. Pulse fitting and two mounting bolts included.
	32mm Mikuni Carburetor Price: $150.00 Quantity in Basket: none
32mm Mikuni Carburetor. This high quality Mikuni carburetor works great on modified GX340's and GX390's. This carburetor offers more horsepower and torque over the Honda carburetors along with the adjustability of a performance carburetor. Easy to install due to Mikuni's simple throttle cable setup.
	Main Jet for 32mm Mikuni Price: $6.00 Quantity in Basket: none
Main jet for 32mm Mikuni carburetor. Choose from the following sizes: 175, 180, 185, 190, 195, 200, 210, 220, 230 & 240
	Pilot Jet for 32mm Mikuni Price: $8.00 Quantity in Basket: none
Pilot jet fits our 32mm Mikuni carburetor. Choose from the following sizes: 30, 32.5, 35, 37.5 & 40
	ARC Billet Rod, 390 Price: $145.00 Quantity in Basket: none
ARC Billet Rod with bearings. The stock rod is the weak link in your engine. Protect your investment with this high quality rod and bearing set. A must have with all big horsepower and high rpm applications.
	Bearings, Replacement for Billet Rod 6272 Price: $22.00 Quantity in Basket: none
Replacement bearings for billet rod 6272.
	Piston, Flat Top, Standard Bore 390 Price: $138.00 Quantity in Basket: none
GX390 flat top piston for a standard bore. Piston rings not included. This is a stock GX390 piston that has been milled to a flat top.
	Piston, Forged Flat Top, 390 Price: $150.00 Quantity in Basket: none
OUT OF STOCK. PLEASE CALL Forged flat top piston comes with wrist pin and clips. Uses factory piston rings (not included). Use a finished bore size of 3.465".
	Rings, Standard, 390 Price: $25.00 Quantity in Basket: none
Standard ring set for the GX390 piston. Fits the flat top piston listed above.
	Rings, File Fit, Standard Bore Price: $28.00 Quantity in Basket: none
Over size rings used for file fit in a standard bore.
	Cam, Custom Ground .315" Lift, GX390 Price: $165.00 Quantity in Basket: none
GX390 Racing Cam .315" lift and 260* duration @ .050" lift. Hard face welding is used for protection against lobe wear. This cam has a great balance between low end torque and top end power. Upgraded valve train is recommended. You may need to clearance the inside of the cam lobes for the crank to pass.
	Cam, Custom Ground .350" Lift, GX390 Price: $165.00 Quantity in Basket: none
GX390 Racing Cam .350" lift and 223* duration @ .050" lift. Hard face welding is used for protection against lobe wear. This is the ultimate low end torque cam. Be prepared to upgrade your clutch to handle this cam. Upgraded valve train is recommended. You may need to clearance the inside of the cam lobes for the crank to pass.
	Cam, Custom Ground .360" Lift, GX390 Price: $165.00 Quantity in Basket: none
GX390 Racing Cam .360" lift and 260* duration at .050" lift. Hard face welding is used for protection against lobe wear. This is a big cam for the hardcore GX390. Upgraded valve train is recommended. You may need to clearance the inside of the cam lobes for the crank to pass.
	ARC Racing Billet Flywheel, 390 NEW Price: $195.00 Quantity in Basket: none
This billet flywheel is very light at 4.7lbs. ARC flywheels use a Neodymium (rare earth) magnet which is the most powerful magnet on the market. Non-adjustable hub. Use flywheel key to adjust timing. Flywheel does not come with a ring gear. Without the ring gear, you will either have to use a handheld starter, or install the starter cup to be used with the pull starter. Uses stock Honda coil. No need for coil bracket and aftermarket coil. Just bolt-on and go! Very high quality. Must have item for any serious GX340 or GX390.
	Advanced Timing Key, 390 Price: $12.00 Quantity in Basket: none
Advanced timing key for Honda GX340/390 and 16hp clone. Choose between a 4 degree and 6 degree key.
	Cylinder Head, 390, Ported & Milled Price: $175.00 Quantity in Basket: none
Cylinder head ported and milled. Increased flow and velocity from our porting makes this head an excellent choice for performance and value. Highly recommended performance upgrade for the racer looking to take his/her GX340/GX390 to the next level.
	Robertson Straight Header Price: $43.00 Quantity in Basket: none
Robertson Straight Header (1.025ID x 15"IL). Accepts 1 5/16" silencer.
	Robertson "Supersnake" Header Price: $59.00 Quantity in Basket: none
Robertson "Supersnake" Header (1.050ID x 23"IL). Accepts 1 5/16" silencer.
	Silencer, RLV Price: $37.00 Quantity in Basket: none
RLV silencer. Choose from three sizes: 1", 1 1/8" & 1 5/16". High quality clamp on silencers. Clamp sold separately.
	Clamp for Silencer Price: $7.55 Quantity in Basket: none
Clamp for RLV silencers. Choose from three sizes: 1", 1 1/8" & 1 5/16".
	Stainless Steel Intake & Exhaust Valve, 390 Price: $65.00 Quantity in Basket: none
These stainless steel valves replace the stock size valves. .075" longer for high lift cams. Must use aluminum retainer/keeper set and lash caps.
	Retainer & Keeper Set, 390 Price: $32.00 Quantity in Basket: none
This retainer and keeper set is designed to be used with our stainless steel 390 valves. Will not work with stock valves.
	Lash Caps, 390 Price: $15.00 Quantity in Basket: none
Lash caps are required for our stainless steel valves. These are 6mm lash caps designed for our stainless steel valves. Will not work on stock valves. Price includes two lash caps.
	Valve Lash Caps, 390, OEM Honda Price: $10.00 Quantity in Basket: none
Lash caps help prevent valve wear. They also provide a larger surface area for the rocker arm. Use with stock exhaust retainers on both stock valves. Price includes two lash caps.
	Retainer for Exhaust Valve, 390 Price: $5.00 Quantity in Basket: none
Stock exhaust valve retainer. Use on stock intake valve to accomodate lash cap.
	Rev Roller Rockers, 390 Price: $215.00 Quantity in Basket: none
Honda (or clone) GX340/GX390 billet roller rocker arms designed and engineered to withstand the valvetrain stress of a modified motor. * dyno tested and race proven * ratio rockers * rocker arm CNC machined from 7000 series alloy * low rotational inertia mass due to super light arm design * bearing grade brass bushings reduce rotational friction * precision ground and hardened roller tip provides ultra smooth rotation * ground and hardened alloy steel rocker shaft design eliminates valve train deflection * cupped lash adjusters with ARP 12 point fastener
	Valve Cover Spacer, 390 Price: $50.00 Quantity in Basket: none
Use this valve cover spacer to provide clearance for our roller rockers. New bolt included. CNC machined from billet aluminum.
	Chrome Moly Push Rods, 390 Price: $30.00 Quantity in Basket: none
Chrome moly push rods are highly recommended when using an AGK racing cam.
	Chrome Moly Pushrods Unassembled, 390 Price: $30.00 Quantity in Basket: none
Cut to size chrome moly pushrods. Assembled length is 6.430".
	Guide Plate, Push Rod Price: $12.50 Quantity in Basket: none
This guide plate has larger slots to accomodate the chrome moly plush rods.
	Valve Spring, 32lbs Price: $10.50 Quantity in Basket: none
The 32lb valve springs are highly recommended when using an AGK racing cam. Change quantity to two if you want two springs.
	Valve Spring, 55lbs Price: $10.50 Quantity in Basket: none
This 55lb valve spring is recommended with our .360" lift cam. Change quantity to two if you want two springs.
	Valve Spring, Dual, 50lb Price: $10.50 Quantity in Basket: none
Dual valve spring for high output motors. Install height 1.300" with 50lb seat pressure. 120lbs open pressure. Coil bind at .600".
	Shim, .029" Price: $0.95 Quantity in Basket: none
When using our stainless steel valves for your GX340/GX390, combined with 32lb valve springs, you need to shim the bottom of the valve springs to make up for the extra length of the stainless valves. You should retain the stock spring seat and add one shim under the exhaust spring and two shims under the intake spring.
	Lifter, Stock GX390 Price: $10.00 Quantity in Basket: none
Genuine Honda GX390 lifter. Big block motors in the 50hp range are wearing out the stock lifters. Use this genuine Honda lifter as a replacement. Sold individually. Change quantity to 2 if you want 2.
	Gasket Set, 390 Price: $26.00 Quantity in Basket: none
Complete engine gaskets set for GX390. Includes head, side cover, valve cover, exhaust and both intake gaskets.