Yost Performance
Yost Performance specializes in motorcycle carburetor tuning and fuel delivery optimization components designed for Harley-Davidson and performance V-twin engines. The brand is known for CV main jet kits, idle air adjusting screws, float bowl speed screw kits, carburetor spacers, fuel atomizers and high-flow fuel fittings. These parts are engineered to improve throttle response, fuel atomization and overall engine efficiency for both stock and modified carbureted setups.
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Out of stock
Yost Performance - JP2 - Constant Velocity Main Jet Kit - Big Twin/Sportster/Twin Cam
Yost Performance
$23.95Yost Performance - DS289186 - Constant Velocity Main Jet Kit - Big Twin/Sportster/Twin CamFeaturesMade in the USASpecsProduct NameJet KitTypeCarburetorModelCVUnitsKitRiding...$23.95 -
Out of stock
Yost Performance - CVMS-S - Idle Air Adjusting Screw Kit - Stainless Steel - Constant Velocity Carburetors
Yost Performance
$29.95Yost Performance - 10500207 - Idle Air Adjusting Screw Kit - Stainless Steel - Constant Velocity CarburetorsFeaturesKnurled and slotted head for easy adjustmentFits CV40 & CV44 carburetorsMade in the...$29.95 -
Out of stock
Yost Performance - 1050-0160 - Float Bowl Speed Screw Kit - S&S Super E/G Carburetor
Yost Performance
$35.95Yost Performance - 10500160 - Float Bowl Speed Screw Kit - S&S Super E/G CarburetorFeatures5/16" hex head design eases bowl removal and jet changingElectropolished stainless steel for a great custom...$35.95 -
Out of stock
Yost Performance - FBS-CV/HSR - Float Bowl Speed Screw Kit - CV/HSR Carburetor
Yost Performance
$35.95Yost Performance - 10500158 - Float Bowl Speed Screw Kit - CV/HSR CarburetorFeatures5/16" hex head design eases bowl removal and jet changingElectropolished stainless steel for a great custom...$35.95 -
Out of stock
Yost Performance - CVMS - Idle Air Adjusting Screw Kit - Brass - Constant Velocity Carburetors
Yost Performance
$29.95Yost Performance - 10500172 - Idle Air Adjusting Screw Kit - Brass - Constant Velocity CarburetorsFeaturesKnurled and slotted head for easy adjustmentFits CV40 & CV44 carburetorsMade in the...$29.95 -
Out of stock
Yost Performance - YSG2 - Carburetor Spacer - S&S Super D and G - 2"
Yost Performance
$40.95Yost Performance - 10130009 - Carburetor Spacer - S&S Super D and G - 2"FeaturesEasy way to add extra torque and horsepowerCan be polished to a bright lusterMade in the USASpecsLength Metric2...$40.95 -
Out of stock
Yost Performance - YSE2 - Carburetor Spacer - S&S Super E and B - 2"
Yost Performance
$40.95Yost Performance - 10130006 - Carburetor Spacer - S&S Super E and B - 2"FeaturesEasy way to add extra torque and horsepowerCan be polished to a bright lusterMade in the USASpecsRiding...$40.95 -
Out of stock
Yost Performance - YSE1.5 - Carburetor Spacer - S&S Super E and B - 1.5"
Yost Performance
$40.95Yost Performance - 10130005 - Carburetor Spacer - S&S Super E and B - 1.5"FeaturesEasy way to add extra torque and horsepowerCan be polished to a bright lusterMade in the USASpecsLength Metric1...$40.95 -
Out of stock
Yost Performance - YSG1.5 - Carburetor Spacer - S&S Super D and G - 1.5"
Yost Performance
$40.95Yost Performance - YSG1.5 - Carburetor Spacer - S&S Super D and G - 1.5"FeaturesMachined from solid 6061 T-6 billet aluminum that completely eliminates porosity problemsEasy way to add extra torque...$40.95 -
Out of stock
Yost Performance - YSG1 - Carburetor Spacer - S&S Super D and G - 1"
Yost Performance
$34.95Yost Performance - 10130007 - Carburetor Spacer - S&S Super D and G - 1"FeaturesEasy way to add extra torque and horsepowerCan be polished to a bright lusterMade in the USASpecsMaterial6061 T-6...$34.95 -
Out of stock
Yost Performance - YSE1 - Carburetor Spacer - S&S Super E and B - 1"
Yost Performance
$34.95Yost Performance - 10130004 - Carburetor Spacer - S&S Super E and B - 1"FeaturesEasy way to add extra torque and horsepowerCan be polished to a bright lusterMade in the USASpecsModelFor Super E and B...$34.95 -
Out of stock
Yost performance - Power Tube Atomizer Kit for HSR 42/45 Jets
Yost Performance
$63.95Yost performance - Power Tube Atomizer Kit for HSR 42/45 Jets Features: Atomizer power tube and jets are CNC-machined from brass for consistency and accuracy Eliminates spitting and popping...$63.95 -
Out of stock
Yost Performance - Power Tube Atomizer for S&S B/D/E/G Carburetor
Yost Performance
$49.95Yost Performance - Power Tube Atomizer for S&S B/D/E/G Carburetor Features: CNC-machined from brass for consistency and accuracy Eliminates spitting and popping through the...$49.95 -
Out of stock
Yost Performance - Performance Fuel Atomizer Master Kit fits '88-'06 Stock 40mm CV Carbs
Yost Performance
$111.95Yost Performance - Performance Fuel Atomizer Master Kit fits '88-'06 Stock 40mm CV Carbs Features: Atomizer power tube and jets are CNC-machined from brass for consistency and accuracy Includes...$111.95 -
Out of stock
Yost Performance - High-Flow Fuel Nipples fits '00-'06 Keihn Carburetors (Butterfly/CV) - Single Outlet (Stainless-Steel)
Yost Performance
$47.95Yost Performance - High-Flow Fuel Nipples fits '00-'06 Keihn Carburetors (Butterfly/CV) - Single Outlet (Stainless-Steel) Features Flow more fuel than the stock OEM nipples Include removal...$47.95 -
Out of stock
Yost Performance - High-Flow Fuel Nipples fits '00-'06 Keihn Carburetors (Butterfly/CV) - Single Outlet (Brass)
Yost Performance
$47.95Yost Performance - High-Flow Fuel Nipples fits '00-'06 Keihn Carburetors (Butterfly/CV) - Single Outlet (Brass) Features Flow more fuel than the stock OEM nipples Include removal tool Made in...$47.95 -
Out of stock
Yost - Harley Intake Manifold Wrench
Yost Performance
$9.45Yost - Harley Intake Manifold Wrench Features: Cuts the work time in half No need to remove the gas tank Made in the U.S.A. by Yost Performance$9.45 -
Out of stock
Yost Performance - Float Bowl Speed Screw Kit S&S E/G
Yost Performance
$35.95Yost Performance - Float Bowl Speed Screw Kit S&S E/G Features: Electropolished stainless steel for a great custom look Will not corrode in extreme climates Longer and stronger than the...$35.95 -
Out of stock
Yost Performance - Float Bowl Speed Screw Kit CV/HSR
Yost Performance
$35.95Yost Performance - Float Bowl Speed Screw Kit CV/HSR Features: Electropolished stainless steel for a great custom look Will not corrode in extreme climates Longer and stronger than the stock...$35.95 -
Out of stock
Yost Performance - CV Main Jet Kit
Yost Performance
$23.95Yost Performance - CV Main Jet Kit Yost Performance is known for quality and their years of experience definitely shows in their products. This main jet kit is a must for your Big Twin...$23.95 -
Out of stock
Yost Performance - Idle Air Adjusting Screws - fits all CV Carburetors - Brass or Stainless-Steel
Yost Performance
$29.95Yost Performance - Idle Air Adjusting Screws - fits all CV Carburetors - Brass or Stainless-Steel The Yost air adjusting screws are designed for easy adjustment with their knurled and slotted head...$29.95
Yost Performance Fuel Tuning Systems – CV Jet Kits, Fuel Atomizers, Intake Spacers & Carburetor Adjustment Components
Yost Performance is a trusted name in carburetor performance tuning and fuel system enhancement, widely used in Harley-Davidson Big Twin, Sportster and Twin Cam applications. The brand is strongly associated with high-search intent keywords such as Harley CV carb jet kit, S&S carburetor tuning kit, motorcycle idle air screw adjustment, CV carb performance upgrade and Harley fuel atomizer kit, making it a go-to choice for riders looking to optimize carbureted engine performance.
The product range includes CV main jet kits, idle air adjusting screw kits in brass and stainless steel, float bowl speed screw kits for CV and HSR carburetors, carburetor spacers for S&S Super E, B, D and G models, power tube atomizer kits, high-flow fuel nipples and intake manifold tools. These components are engineered to improve fuel-air mixture precision, enhance throttle response, reduce hesitation and support smoother engine performance across different riding conditions.
Yost Performance products are widely used in Harley performance builds, custom chopper tuning, carburetor rebuilds and engine fuel system optimization projects. Popular search phrases include best CV carb tuning kit Harley Davidson, S&S Super E carb spacer performance upgrade, motorcycle carb jetting kit, fuel atomizer upgrade for Harley CV carb and idle mixture screw performance adjustment kit. With a strong focus on precision fuel delivery and carburetor efficiency, Yost Performance continues to be a preferred choice for riders and builders seeking reliable tuning solutions.