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 Mikuni 32mm Carburetor
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Our Mikuni 32mm performance carburetor will give your GX390 a major boost in power! This carburetor configuration is setup to run on gasoline. We have Alky conversion kits listed below if you want to run Alcohol fuel! The GX390 will really come alive when converted to Alcohol!
This carburetor features a round slide throttle valve and a spigot mount. *Be sure to add the needle and seat that we have listed below if you are going to be running a pulse type fuel pump*
The carb is also equipped with a flip lever choke.
Our performance kits are dyno tested and track proven to get you the results your looking for!
 Honda GX390 Robertson "Supersnake" Header
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Robertson Supersnake header that fits Honda GX340 and GX390 engines!
1.050" i.d.
23" L
Comes with all the necessary mounting hardware.
 GX340 & GX390 Performance Kit 1
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This kit will get your GX340 or GX390 breathing! Our custom hard faced camshaft profile, 55lb. valve spring package, stainless steel swirl polished valves, Comp Cams chrome moly pushrods and a performance guideplate that requires no modifications or altering is all included in this package. Don't forget to add our related products to finish your installation.
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Intake valve diameter
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1.380"
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Exhaust valve diameter
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1.225"
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Pushrod length
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7" (tube end to tube end)
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Pushrod end diameter
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3/16" ball
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Pushrod diameter
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1/4"
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Pushrod wall thickness
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.030"
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Intake lobe lift
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.355"
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Intake lobe duration @.050" cam lift
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252 degrees
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Exhaust lobe lift
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.355"
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Exhaust lobe duration @ .050" cam lift
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252 degrees
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Compression release
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Yes
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Stainless Steel Valves
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Resists wear and takes the abuse that stock valves don't
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Performance Valve Springs
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This spring package matches our camshaft profiles and adds life to your valvetrain when using our modified camshafts
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Racing Camshaft
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Our cams are hard faced and ground to our lobe profile specification! Many hours of R&D are put into designing these profiles!
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Chrome Moly Pushrods
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These pushrods are made by the industry leader Comp Cams! They are a must when increasing the spring rate and modifying camshaft profiles!
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 GX340 & GX390 Performance Kit 2
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This kit is another great upgrade for your GX340 or GX390 karting engine! This kit includes the same components as Kit 1, but has a billet aluminum flywheel to further enhance performance and engine throttle response! With the billet flywheel only weighing 4 lbs. 6 oz. as compared to your stock cast iron flywheel weighing anywhere from 11 to 12 lbs. is sure to give you the needed durability and SAFETY! The flywheel is SFI approved. Don't forget to add the related products that we offer to complete your installation!
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Intake valve diameter
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1.380"
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Exhaust valve diameter
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1.225"
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Pushrod length
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7" (tube end to tube end..cut to desired length)
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Pushrod end diameter
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3/16" ball
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Pushrod diameter
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1/4"
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Pushrod wall thickness
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.030"
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Adjustable ignition timing
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Flywheel has non-adjustable hub
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Flywheel / Starter option
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Flywheel will accept factory recoil starter cup and recoil starter
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Intake lobe lift
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.355"
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Intake lobe duration @ .050" cam lift
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252 degrees
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Exhaust lobe lift
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.355"
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Exhaust lobe duration @.050" cam lift
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252 degrees
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Compression release
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Yes
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Stainless Steel Valves
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Resists wear and takes the abuse that stock valves don't
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Billet Flywheel
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Lightweight, low inertia, billet aluminum flywheel that is much safer than the heavy factory cast iron flywheel and it will gain acceleration response too!
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Performance Valve Springs
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High silicon material valve springs to match our camshaft profiles and reduces valve bounce that robs power!
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Chrome Moly Pushrods
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Made by the industry leader Comp Cams! These chorme moly pushrods will eliminate pushrod flex and give you every bit that your camshaft demands!
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Racing Camshaft
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The heart of making power in an engine is the camshaft and our lobe profile will do just that!
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 GX340 & GX390 Performance Kit 3
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Step up the performance with our Stage 3 kit! This kit comes with everything that kit 2 comes with plus our newly designed cylinder head and header package! The exhaust flange on this head has been changed and our header is the best on the market. No need to worry about breakage as the flange on this pipe features a 1/4" thick flange and will not warp! The header features a three stage pipe and has been dyno and track proven! Also with this kit you will get our 1.12:1 ratio rockers! These rockers will not fail under the high spring forces of a modified valvetrain setup! Also, we've increased the valve lift from .355" to a whopping .397" lift by just adding our rockers to this package!
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Intake valve diameter
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1.380"
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Exhaust valve diameter
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1.225"
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Intake lobe lift
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.355"
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Intake lobe duration @ .050" cam lift
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252 degrees
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Exhaust lobe lift
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.355"
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Exhaust lobe duration @ .050" cam lift
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252 degrees
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Compression release
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Yes
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Pushrod length
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7" (tube end to tube end..cut to length)
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Pushrod end diameter
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3/16" ball (press in)
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Pushrod diameter
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1/4"
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Pushrod wall thickness
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.030"
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Cylinder head
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Direct replacement cylinder head with a re-designed exhaust port flange!
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Racing header
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Our newly designed karting header, which features a 1/4" thick flange to eliminate warpage!
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Increased rocker arm ratio
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Increase the valve lift and power of your engine by adding these rocker arms to your GX340 or GX390..they are much stronger than any reinforced rocker!
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Billet Flywheel
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Lightweight, low inertia, billet aluminum flywheel that is much safer than the factory heavy cast iron flywheel and the billet flywheel will increase your acceleration!
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Performance valve springs
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High quality silicon material valve springs that match our camshaft profile
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Chrome moly pushrods
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Made by the industry leader Comp Cams! These pushrods will eliminate pushrod flex that robs power from your engine!
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Racing camshaft design
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The heart of making power in an engine is camshaft knowledge! Our camshaft profiles will get you the power your needing to propel your kart to the front of the field!
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 GX340 & GX390 Performance Kit 4
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This kit includes our billet aluminum Rev Roller Rockers, Parsons Racing header package, newly designed cylinder head, racing camshaft package, matching valve spring package, Comp Cams pushrods, swirl polished stainless steel valves and billet aluminum flywheel! Don't forget to look at our related products to complete your installation.
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Intake valve diameter
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1.380"
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Exhaust valve diameter
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1.225"
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Intake lobe lift
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.283"
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Intake valve lift (1.3:1 rocker)
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.368"
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Intake lobe duration @ .050" cam lift
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242 degrees
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Exhaust lobe lift
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.283"
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Exhaust valve lift (1.3:1 rocker)
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.368"
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Exhaust lobe duration @ .050" cam lift
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242 degrees
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Pushrod diameter
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1/4" o.d.
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Compression release
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Yes
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Roller rocker arms
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Low inertia, higher lift, faster valve acceleration all great ingredients for making power and these rockers are just the ticket!
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Cylinder head
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High performance cylinder head package with a re-designed exhaust port flange!
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Racing header
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Our newly designed karting header, which features a 1/4" thick flange to eliminate warpage.
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Increased rocker arm ratio
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This increases the amount of valve lift and power from your engine! These are the ultimate rocker arms available!
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Billet flywheel
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Lightweight, low inertia, billet aluminum flywheel that is much safer and outperforms the stock flywheel by leaps and bounds..will also increase the throttle response of your engine!
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Performance valve springs
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High quality, high tensile strength material that matches our camshaft design profile!
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Chrome moly pushrods
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Made by the industry leader Comp Cams! These pushrods eliminate pushrod flexing that occurs with stock pushrods and will maintain the power throughout the rpm range.
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Racing camshaft design
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This camshaft profile works great with our 1.3:1 ratio roller rocker arms!
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 GX340 & GX390 Performance Kit 5
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Click to enlarge image(s) |
This kit includes our newly designed cylinder head, our dyno and track tested racing header, billet aluminum SFI approved flywheel, billet aluminum 7075 T-6 connecting rod with babbit bearings, Rev Roller Rocker arms, Parsons Racing camshaft design, Comp Cams pushrods, swirl polished stainless steel valves, racing valve springs, lash caps, retainers, and header bolts with safety wire. Get your kit now and move to the front of the field!
Don't forget our related products to complete your installation!
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Intake valve diameter
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1.380"
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Exhaust valve diameter
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1.225"
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Rocker arm ratio
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1.3:1
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Rod length
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4.410"
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Valve spring rate (closed)
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55 lbs.
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Pushrod diameter
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1/4" od
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Intake lobe lift
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.283"
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Intake lobe duration @ .050" cam lift
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242 degrees
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Intake valve lift (1.3:1 rocker)
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.368"
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Exhaust lobe lift
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.283"
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Exhaust lobe duration @ .050" cam lift
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242 degrees
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Exhaust valve lift (1.3:1 rocker)
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.368"
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Compression release
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Yes
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Billet aluminum connecting rod
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7075 T-6 aircraft grade aluminum with babbit bearing inserts
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Forced oiling dipper
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As the connecting rod enters the crankcase oil it forces oil from the dipper into the bearing area
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Roller rocker arms
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Low inertia, higher lift, faster valve acceleration all great ingredients for making more power..so these rockers are the ticket!
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Racing cylinder head
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Our newly designed performance cylinder head package that incorporates a re-designed exhaust port flange area!
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Performance exhaust header
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This is our newly designed racing header for our cylinder head package...With a .990" id and 20" long it really pulls hard off the turn!
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Increased rocker arm ratio
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This increases the amount of valve lift and as a result increases torque and horsepower! These are the best rocker arms available!
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Billet flywheel
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Lightweight, low inertia, billet aluminum flywheel that is much safer and outperforms the stock flywheel! This will also increase your throttle response for that off the corner hole shot!
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Performance valve springs
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High quality, high tensile strength material that matches our camshaft selection!
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Chrome moly pushrods
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Made by the industry leader Comp Cams! These pushrods eliminate any unwanted pushrod flexing, which can rob power!
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Racing cam profile
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Our camshaft grind works great with our Rev Roller Rocker arms!
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 GX340 & GX390 High Temperature Viton Crank Seals
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Don't rebuild your engine without using our high temperature crankshaft oil seals! These are made from Viton material and will resist higher temperatures and won't harden up as fast as the Nitrile seals that come from the factory from Honda new. These are sold as a pair.
 Engine Mount
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Having trouble finding an engine mount for your GX390 or LCT 414cc engine? Well look no further as we have the mount you need! This mount is a black anodized aluminum mount that fits all GX340 & GX390 engines. It comes with all the hardware and butterfly clamps to mount your engine to the kart frame.
Please select your mount configuration to match your chassis make and angle you prefer!
 Parsons Xtreme Velocity Big Block header
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This is our newest header available for our new style GX390 racing cylinder heads! These are high quality, lazer cut thick flanged, precision welded headers. They are a .990" id 3-staged header and are 20" long. They are dyno tested and track proven! Our new head and header package has proven to perform better than the Honda factory head!
 Lucas Oil Karting and Junior Dragster Oil
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Our Lucas racing oil is designed specifically for Go Karts, Quarter Midgets and Junior Dragsters! This 100% synthetic racing oil is a 0W-20 ultra-light viscosity engine oil. This oil is developed for high rpm naturally aspirated gasoline and alcohol engines. You will experience less friction and lower oil temperatures by using this racing oil.
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Viscosity
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0W-20
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Fl. oz.
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16
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 Kart Racing Air Filter 3 1/2" x 6" x 2 7/16" angled style
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These are high quality fabric type air filters designed specifically for the kart racer. Karting engines require the best air filtration possible since the filter is located only inches off the ground where the most dust is located. Dimensions: 3 1/2" x 6" x 2 7/16" angled style
 Kart Racing Air Filter 3 1/2" x 4" x 2 7/16" angled style
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These are high quality fabric type air filters designed specifically for the kart racer. Karting engines require the best air filtration possible since the filter is located only inches off the ground where the most dust is located. Dimensions: 3 1/2" x 4" x 2 7/16" angled style
 GX390 High Performance Valve Springs
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Fits our LCT 414cc engines, Honda GX340, Honda GX390 and all Honda 11 and 13hp Clones! An excellent upgrade that works with our hard faced .355" lift camshafts and can be used with the stock retainers!
 Billet Aluminum Flywheel - SFI approved
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This flywheel is a must for any serious racer! This flywheel will fit the Honda GX390 and LCT 414cc engines with no modifications. You can shave a significant amount of weight off of your rotating mass, gain performance and acceleration and not to mention added safety! This flywheel will shave 50% of your flywheel weight by going to this flywheel!
 Billet Aluminum Flywheel w/ring gear
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This flywheel will fit the Honda GX390 and LCT 414cc engines! This flywheel incorporates an electric start ring gear for those who prefer the onboard electric starter! The flywheel will also shave unwanted rotating weight from your engine and give you added performance and acceleration!
 Chrome Moly Pushrods
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Fits our LCT 414cc engines as well as the Honda GX340 and GX390 engines. Requires modified guideplate for the Honda GX340/390 engines. It is a direct drop in upgrade part for your LCT 414cc engine with no modifications needed, which adds durability to your valvetrain because of the chrome moly material and wall thickness of the tube.
 High Performance Copper Head Gasket
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This high performance head gasket is an excellent choice for your Honda GX390, Honda 390cc clone or the LCT 414cc engines! It is a copper head gasket that has many benefits over the stock head gasket. Copper head gaskets will take the abuse that your engine experiences. This gasket is made from the same material as the Top Fuel Dragsters producing thousands of horsepower!
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Bore diameter
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3.625" (92mm)
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Thickness
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.020"
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Copper
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Provides excellent heat transfer and more clamp force that equals more power!
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 Valve Spring Retainer Set - GX390
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Our valve spring retainers fit our GX390 55lb. valve springs. These retainers will also fit our LCT 414cc racing engines and Honda GX610, GX620 and GX670 engines along with our valve springs. Upgrade the durability of your GX390 valvetrain by installing our retainers and bead lock setup!
 ARC Honda GX390 Billet Connecting Rod
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ARC billet aluminum Honda GX390 connecting rod
Works in the 390 Clone engines too!
 Block off plate for GX390 electric start engines
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 Crankcase Cover Gasket GX390
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Crankcase cover gasket for the Honda GX390 engine
 Flywheel screen - blue GX390
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Blue flywheel screen that fits the following engines:
Honda GX340
Honda GX390
LCT 414
420cc Clones
 GX390 Flywheel Fan
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GX390 flywheel fan for minicup racing or replace your worn or cracked fan blades with these new flywheel fans *While quantities last*
GX390 High Performance Valve Springs
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Fits our LCT 414cc engines, Honda GX340, Honda GX390 and all Honda 11 and 13hp Clones! An excellent upgrade that works with our hard faced .355" lift camshafts and can be used with the stock retainers!
 GX390 Performance Camshaft
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Click to enlarge image(s) |
Bring your Honda GX390 to life with our camshaft selections! These cams feature hard faced lobes for increased durability and performance when using high spring force rates. This camshaft works great with our valve spring setup listed below in our related items section. All of these cams have the compression release. Just choose your profile listed below and click the box for that profile then add the quantity you need
 Head Gasket GX390
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If you are looking to increase the power of your GX390 engine then our coated steel head gasket will do just that. This gasket has many new and improved features that the stock gasket just can't provide!
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Thickness
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.012"
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Bore
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3.556"
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 Honda GX240, GX270, GX340 and GX390 ignition coil
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Honda GX240, GX270, GX340 and GX390 ignition coil
 Honda GX340 and GX390 connecting rod
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Honda GX340 and GX390 connecting rod (Standard rod pin diameter)
 Honda GX390 carburetor
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Honda GX390 replacement carburetor
We have modified, blueprinted and flow tested performance versions available.
 Honda GX390 cylinder head gasket
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Honda GX390 cylinder head gasket
 Honda GX390 piston rings
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Honda GX390 piston rings (Standard bore diameter)
Honda GX390 Robertson "Supersnake" Header
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Click to enlarge image(s) |
Robertson Supersnake header that fits Honda GX340 and GX390 engines!
1.050" i.d.
23" L
Comes with all the necessary mounting hardware.
 Honda GX390 Rocker Arms
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Honda GX390 and Big Block Clone stock rocker arms
 Parsons Xtreme Velocity GX390 (2 stage)
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This our Xtreme Velocity 2 Stage Honda GX340 / GX390 karting header.
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Header flange thickness
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1/4"
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Header length
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16"
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1st Stage dimensions
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1.150" i.d. (13" from flange)
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2nd Stage dimensions
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1.200" i.d. (3" in length)
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Fits silencer inside dimension:
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1 5/16"
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 Parsons Xtreme Velocity GX390 3 Stage Header
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This is our Honda GX340 / GX390 3 Stage karting header! This pipe gives excellent torque with the primary being a little smaller than the 2 stage header we have.
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Header flange thickness
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1/4"
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Primary dimension
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.980" i.d. (8 1/2" from end of flange)
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2nd Stage
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1.100" i.d. (3" in length)
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3rd Stage
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1.200" i.d. (4" in length)
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Total length
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15 1/2"
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Fits silencer inside dimension:
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1 5/16"
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 Rod Bearings ARC GX390 Rod
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These rod bearings fit the ARC GX390 connecting rods
 Stainless Steel Valves for GX390
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Uses our retainer and lock setup along with our 55 lb. valve spring combination.
You can select the intake or exhaust valve sizes below:
Valve Spring Retainer Set - GX390
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Our valve spring retainers fit our GX390 55lb. valve springs. These retainers will also fit our LCT 414cc racing engines and Honda GX610, GX620 and GX670 engines along with our valve springs. Upgrade the durability of your GX390 valvetrain by installing our retainers and bead lock setup!
Honda GX390 carburetor
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Honda GX390 replacement carburetor
We have modified, blueprinted and flow tested performance versions available.
 Mikuni 32mm Flat Slide Carburetor
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Click to enlarge image(s) |
This carburetor is a great improvement for your Honda GX340 or GX390 engine! This carburetor features a flat slide throttle valve for increased airflow and throttle response. With this carburetor you get the fuel circuits modified to adapt with the GX340/GX390 engine and fuel inlet/regulating system adjusted for either gravity feed or pulse type fuel pumps for optimum efficiency. Don't forget to add our billet aluminum intake manifold to complete the installation.
 Parsons Xtreme Velocity Serpentine Pipe
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Our custom designed Serpentine karting pipe fits any Honda GX340 and GX390 engine for awesome mid range torque!
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Header Flange
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1/4" thick
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Length
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25"
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Primary specs
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1" i.d. (18" in length)
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2nd Stage
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1.100" i.d. (3" in length)
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3rd Stage
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1.200" i.d. (4" in length)
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Fits silencer inside dimension of:
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1 5/16"
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Heavy Duty Flange
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Less warpage and exhaust gas leakage
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 Shopping Basket
Note: All prices in US Dollars
 Specials
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