CV Performance

The original EZ-Just® mixture screw for Harley CV carburetors adjusts the air idle mixture. Easily tune and adjust your idle mixture without burning your hands or fumbling with a screwdriver. CV Performance has exclusively provided Harley riders with the EZ-Just® for over 30 years. Special through - only $19.95 --> There is only one original EZ-Just®Beware of cheap import knock offs! Read more below.  Compatible with all Harley CV style carburetors and replaces the stock mixture...

Complete carburetor performance in an all-inclusive kit. The CV Performance Tuner's Kit for Harley-Davidson motorcycles is far more than a recalibration jetting kit. By way of CVP's custom designed needle, spring, and vortex emulsion tube, the complete kit will unleash the full potential of your Harley's stock carburetor. Also includes an assortment of jets, s/s hardware, gaskets, and full tuning instructions. Saves 25% compared to ordering components separately.  Due to high demand of...

Complete carburetor performance in an all-inclusive kit. The CV Performance Deluxe Tuner's Kit w/EZ-Just for Harley-Davidson motorcycles is far more than a recalibration jetting kit. By way of CVP's custom designed needle, spring, and vortex emulsion tube, the complete kit will unleash the full potential of your Harley's stock carburetor. Also includes an assortment of jets, s/s hardware, gaskets, and full tuning instructions. The Deluxe kit is our most popular and includes the EZ-Just...

The Premium Tuners Kit includes everything in our Deluxe kit + our Stainless Steel Extended Idle Screw and Mixture Packing Kit. Complete carburetor performance in an all-inclusive kit. The Premium Kit for Harley-Davidson motorcycles is far more than a recalibration jetting kit. By way of CVP's custom designed needle, spring, and vortex emulsion tube, the complete kit will unleash the full potential of your Harley's stock carburetor. Also includes an assortment of jets, s/s hardware, gaskets,...

Introducing our exclusive Basic Renewal Kit for 92-06 Harley CV style carburetors. The kit contains the most commonly replaced quality seals needed to renew your Harley CV carburetor. For use with all 1992-2006* Big Twin and XL models using the late model Harley CV 40 carburetor. SALE - only $17.95 CVP Accelerator Pump Diaphragm- Superior material outlasts many other diaphragms.- Resists the harmful effects of modern pump gas.- Replaces OEM 27361-76A Float needle...

CVP's exclusive Velocity Emulsion Tube is a direct replacement for the stock Harley CV carburetor emulsion jet holder. Specially designed to provide a fine vortex pattern atomized mist for an optimal air/fuel mixture without impacting mileage. Unlike some aftermarket tubes, the Velocity Tube accepts both H-D factory and OEM replacement main jets for ease of tuning. Available for all 1989-2006 Big Twin, Twin Cam, and Sportster models using Harley CV style carburetors. Direct replacement for H-D...

Complete vacuum slide assembly for Harley CV carburetors. Replaces original H-D p/n #27585-88. Slide replacement is recommended when the diaphragm eventually becomes pinched or torn, or if the vacuum port hole has been modified by drilling 1/8" or larger causing driveability problems.  Also available in a premium version slide - tumble polished and a heavy duty diaphragm. Fits all Harley CV 40 carburetors: Big Twin 1990-2006 or Sportster 1989-2006. Not for use on other Keihin CV...

Introducing our exclusive Basic Renewal Kit for early model 89-91 Harley CV style carburetors. The kit contains the most commonly replaced quality seals needed to renew your Harley CV carburetor. For use with 1990-1991* FL/FX Big Twins and 1989-1991 XL models using the early model Harley CV 40 carburetor with 2-piece bowl seals (see photo). Spring Special - only $17.95 CVP Accelerator Pump Diaphragm- Superior material outlasts many other diaphragms.- Resists the harmful effects...

Introducing our exclusive Premium Rebuild Kit for Harley CV Carburetors. The kit contains all of the vital seals and gaskets needed to rebuild your Harley CV carburetor. Our kit contains only premium quality seals and gaskets that exceed original factory standards. For use with all 1990-2006 Big Twin or 1989-2006 XL models using the Harley CV 40 carburetor. Replaces factory rebuild kit 27006-88 Unlike inferior mass produced kits and imports sold everywhere else, our...

Precision American made pilot jets for Harley CV and CVK carburetors. Sizes #42, 44, 45, 46, 48, and 50.CVP jet quality exceed OEM and Keihin (Harley) carburetor jets.  Not for use or sale in California SIZE Original Harley P/N Keihin P/N #42 27171-89 N424-25B-42 #44   N424-25B-44 #45 27170-89 N424-25B-45 #46   N424-25B-46 #48 27165-90 N424-25B-48 #50   N424-25B-50 Note: CVP jets are exclusively made by CV Performance in the United States. We do not import or use...

Precision American made main jets for Harley CV carburetors. Sizes #170, 175, 180, 185, 190, 195, and 200.CVP jet quality exceeds OEM and imported carburetor jets. Fits stock style jet holders / emulsion tubes only*Important Note: Main jets supplied by CVP are sized to original OE specifications from H-D and Keihin. If using with a DynoJet kit or various aftermarket jet holders (emulsion tube) the threads will not match. Always use an original holder/tube or the CVP emulsion tube...

Premium vacuum slide assembly for Harley CV carburetors. Tumble polished body and heavy duty rubber diaphragm for added durability. Replaces original Harley OE p/n #27585-88.  Our Premium Slide is tumble polished and uses a heavy duty diaphragm. Also available in our standard Harley Vacuum Slide Assembly HERE Fits all Harley CV 40 carburetors: Big Twin 1990-2006 or Sportster 1989-2006. Not for use on other Keihin CV carburetors. * We personally inspect every slide diaphragm...

CVP's exclusive Premium Intake Manifold Boot Seal for Harley CV carburetors.  Boot seal mates the CV40 carburetor spigot end to the stock slip-fit Harley manifold. Finally a manifold boot seal that seals correctly! Improved fit for a positive seal on all Harley models using slip fit (spigot) CV carburetors. Greater resistance against drying and cracking. Firmly provides a tight leak-free seal to cure vacuum leaks. Replaces the old factory boot seal between the carburetor and...

CVP's exclusive Harley Accelerator Pump Diaphragm replaces worn or cracked diaphragms on Harley CV and Harley Keihin butterfly carburetors. Perfect fit, no more stretching or misaligned seals. Greater resistance to mild fuel additive exposure commonly found in pump gas. Will outlast many standard diaphragms when minimal Ethanol* enhanced fuel is occasionally used. Will fit on both stock Harley carburetors and S&S Super E or G.--> Sold individually, diaphragm only. Replaces Harley p/n...

Replacement packing for use with the EZ-Just mixture screw or stock mixture screw. Includes the Viton® o-ring, washer, and spring that can be lost when removing the original mixture screw. These repack parts are a CVP exclusive and not available from the factory. Fits Harley Keihin 'Butterfly' and CV style carburetors 1981-2006. This packing kit also fits many CVK carburetors including: CVK40, CVK36, and CVK34 carburetors.* Note that in areas now using Ethanol as a 10% fuel additive, replacing...

The CVP Fuel Max Inlet ElbowTM replaces the stock fuel inlet on Harley CV40, and Harley Keihin butterfly carburetors. Increases flow by up to 30% – 40% when used with 5/16" fuel line. Single piece brass design will not break or leak like stock plastic-end replacement fuel elbows. Compatible with all Harley CV (constant velocity) and Harley Keihin butterfly style carburetors 1981-2006. Includes a replacement stainless steel hose clamp.--> JULY SALE - only $17.95 Instructions on replacing the...

Designed to cure hesitation and deliver even throttle response, the CVP Velocity Needle is a direct replacement for stock Harley slide needles. CVP's custom needle outperforms factory needles while eliminating trial and error tuning. No clips or shims to mess with, simply install and ride! CNC machined from aircraft quality billet aluminum for precision and durability. Available for all Harley constant velocity (CV) carburetors on 1989-2006 Big Twin and Sportster models. Not for use or sale in...

CVP's stainless steel idle speed screw for Harley CV and Keihin butterfly style carburetors. Now adjust your idle speed by hand without the need for a screwdriver. High quality single piece stainless steel construction guarantees durability and resistance to corrosion. Large easy to locate slotted head provided for fine tuning when a longer reach is still needed. Also includes stainless steel spring. Compatible with all Harley CV40 and Keihin butterfly style carburetors 1981-2006.* CVP Idle...

A direct replacement for the factory discontinued Harley N65C needle. The classic N65C needle was originally fitted to the first CV carburetor on 1988 Harley-Davidson Sportsters that lacked an accelerator pump, therefore requiring a needle with a richer profile just off idle to overcome the lean stumble. For years tuners and techs have used the N65C needle to custom tune all model Harley CV carburetors to deliver the optimal amount of fuel just off idle, smooth acceleration, and eliminate...

-->Accelerator Pump Boot Seal for Harley carburetors. Prevents dust and debris from collecting inside the accelerator pump while retaining any silicone lube used on the pump shaft. Replaces Harley OE p/n 237311-76 and 237311-76A found on 1989-2006 Harley CV40 carburetors and and Harley butterfly carburetors with an accelerator pump. Sold each one per package. Will not fit on non-Harley model carburetors. Image may differ from the actual product. Aftermarket boot cover seal, photos may...

Complete Float Bowl Assembly for Harley CV Carburetors. Replaces original carb float bowl H-D p/n 27159-92 on 1992-2006* Harley models only. Ideal replacement for a damaged or worn float bowl assembly on your 40mm carb, or to improve weak accelerator pump fuel delivery. Unlike any other Harley carb float bowl assembly on the market, our exclusive assembly comes complete with high quality CV Performance® upgrades found no where else. Backorder / Waiting List - ETA 9/21 - 9/25 Exclusive Features...

Harley brass fuel inlet elbow replaces the stock fuel inlet on Harley CV 40mm carburetors and earlier Harley Keihin butterfly carburetors. Direct replacement for OE p/n 27371-76A. Accepts stock size 1/4" fuel hose while improving flow by up to 20% when compared to stock inlet fittings. Our high quality fuel inlet is NOT a repurposed plumbing fitting commonly sold elsewhere (eBay etc). Compatible with all Harley CV40 and Harley Keihin butterfly style...

The all new CVP Choke Bracket. Made from polished stainless steel, our choke bracket moves the choke knob conveniently to the top of the carburetor for that custom look. Made from durable polished stainless steel and includes all stainless steel mounting hardware to stand up to the elements. Choke cable assembly not included. Fits all 1990-2006 Big Twin and Sportster models using CV style carburetors with aftermarket air cleaner assembly only. Requires aftermarket air cleaner assembly or...

Carburetor bowl gasket seal for early model 1989-91 Harley CV style carburetors. Replaces OE p/n 27577-88. For use with 1990-1991* FL/FX Big Twins and 1989-1991 XL models using the early model Harley CV 40. Special - only $4.95 Bowl Gasket Seal *- Quality seal replaces dried or cracked bowl seal.- Replaces p/n 27577-88* *For use on early 1989-91 Harley CV carburetors only that uses a separate o-ring around the accelerator pump nozzle (not included). Bowl seal will NOT...