{"product_id":"gy6s-128-19-28-koso-ksr-28mm-carburetor-features-a-semi-flat-d-shaped-slide-for-gy6-scooters","title":"KOSO KSR 28mm CARBURETOR FEATURES A SEMI-FLAT D-SHAPED SLIDE FOR GY6 SCOOTERS","description":"KOSO KSR 28mm PERFORMANCE CARBURETOR \u003ch3\u003eSemi-Flat D-Shaped Slide • 4-Stroke Performance Carb • DA928300\u003c\/h3\u003e \u003cp\u003eUpgrade your fuel system with the \u003cstrong\u003eKOSO KSR 28mm Performance Carburetor\u003c\/strong\u003e, designed for riders and builders looking for improved throttle response, increased fuel-flow capability, and more precise tuning than a basic stock-style carburetor.\u003c\/p\u003e \u003cp\u003eThe KSR features KOSO's \u003cstrong\u003esemi-flat D-shaped throttle slide\u003c\/strong\u003e, which is designed to increase fuel flow for better throttle reaction. This design also helps reduce incomplete combustion and improve combustion efficiency when the carburetor is properly tuned.\u003c\/p\u003e \u003cp\u003eThe \u003cstrong\u003e28mm KSR\u003c\/strong\u003e is an excellent choice for many performance 4-stroke scooter, GY6, ATV, go-kart, and buggy applications, particularly engines that have been modified with big-bore kits, performance heads, cams, intake systems, or exhaust upgrades.\u003c\/p\u003e \u003ch2\u003ePRODUCT SPECIFICATIONS\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e KOSO\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eSeries:\u003c\/strong\u003e KSR\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eKOSO Part Number:\u003c\/strong\u003e \u003cstrong\u003eDA928300\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eCarburetor Size:\u003c\/strong\u003e \u003cstrong\u003e28mm\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eEngine Type:\u003c\/strong\u003e \u003cstrong\u003e4-Stroke Only\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eThrottle Valve:\u003c\/strong\u003e Semi-Flat D-Shaped Slide\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eAir Filter Side Outside Diameter:\u003c\/strong\u003e \u003cstrong\u003e50mm\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eIntake Manifold Side Outside Diameter:\u003c\/strong\u003e \u003cstrong\u003e35mm\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eMain Jet:\u003c\/strong\u003e \u003cstrong\u003e#100\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eSlow \/ Pilot Jet:\u003c\/strong\u003e \u003cstrong\u003e#40\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003ePower Jet:\u003c\/strong\u003e \u003cstrong\u003e#30\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eJet Needle:\u003c\/strong\u003e \u003cstrong\u003eJ\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eNeedle Position:\u003c\/strong\u003e \u003cstrong\u003ePosition 3\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eAir Adjustment Screw Baseline:\u003c\/strong\u003e \u003cstrong\u003e1-1\/2 Turns\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePLEASE NOTE:\u003c\/strong\u003e Factory jetting should be considered a starting point. Final jetting will depend on your engine and modifications.\u003c\/p\u003e WHY CHOOSE THE KOSO KSR? \u003cp\u003eThe KSR isn't simply another stock replacement carburetor.\u003c\/p\u003e \u003cp\u003eKOSO designed the KSR around a \u003cstrong\u003esemi-flat D-shaped throttle slide\u003c\/strong\u003e that changes the way air and fuel are delivered as the throttle is opened.\u003c\/p\u003e \u003cp\u003eWhen properly installed and tuned, the KSR design can provide:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eFaster throttle response\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003eImproved throttle reaction\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eIncreased fuel-flow capability\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBetter air\/fuel control\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eImproved combustion efficiency\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBetter support for modified engines\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePrecise tuning through jets and needle adjustment\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eImproved performance potential compared with restrictive stock carburetor setups\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e SEMI-FLAT D-SHAPED SLIDE \u003cp\u003eOne of the most important features of the KOSO KSR is its specially designed \u003cstrong\u003esemi-flat D-shaped throttle slide\u003c\/strong\u003e.\u003c\/p\u003e \u003cp\u003eThe design is intended to increase fuel flow and provide quicker throttle reaction compared with conventional carburetor designs.\u003c\/p\u003e \u003cp\u003eFor performance applications, this means the carburetor can react quickly to throttle input while supplying the additional air\/fuel mixture demanded by a modified engine.\u003c\/p\u003e \u003cp\u003eThis makes the KSR particularly useful on engines equipped with:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eBig-bore cylinder kits\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance cylinder heads\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBig-valve heads\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance camshafts\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePorted cylinder heads\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance intake manifolds\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eHigh-flow air filters\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance exhaust systems\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e GREAT CHOICE FOR PERFORMANCE GY6 BUILDS \u003cp\u003eThe \u003cstrong\u003e28mm KSR\u003c\/strong\u003e can be an excellent carburetor choice for many GY6 performance combinations.\u003c\/p\u003e \u003cp\u003eCommon applications can include:\u003c\/p\u003e \u003ch3\u003eGY6 125cc \/ 150cc\u003c\/h3\u003e \u003cp\u003eUseful where a larger performance carburetor is appropriate, particularly when combined with intake, cylinder-head, camshaft, or exhaust modifications.\u003c\/p\u003e \u003ch3\u003e155cc PERFORMANCE BUILDS\u003c\/h3\u003e \u003cp\u003eA good option for engines where increased displacement and performance modifications require additional airflow.\u003c\/p\u003e \u003ch3\u003e171cc BIG BORE BUILDS\u003c\/h3\u003e \u003cp\u003eThe 28mm size is well suited to many 171cc performance combinations using upgraded heads, cams, intake systems, and exhausts.\u003c\/p\u003e \u003ch3\u003e180cc PERFORMANCE BUILDS\u003c\/h3\u003e \u003cp\u003eCan also be used on larger GY6 builds depending on cylinder-head flow, camshaft, intake, exhaust, compression, and desired engine characteristics.\u003c\/p\u003e COMMON VEHICLE TYPES \u003cp\u003eDepending on the engine and intake configuration, the KSR 28mm can be used with many:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eGY6 Scooters\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eChinese Scooters\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003ePerformance Scooters\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eATVs\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eGo-Karts\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eBuggies\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eCustom 4-Stroke Builds\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eFITMENT IS NOT DETERMINED BY ENGINE SIZE ALONE. PLEASE VERIFY YOUR CONNECTION SIZES BEFORE ORDERING.\u003c\/strong\u003e\u003c\/p\u003e IMPORTANT – 28mm DOES NOT MEAN 28mm CONNECTION SIZE \u003cp\u003eThe advertised \u003cstrong\u003e28mm measurement refers to the nominal carburetor bore size.\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eIt does NOT mean that the outside of the carburetor measures 28mm.\u003c\/p\u003e \u003ch3\u003eAIR FILTER CONNECTION:\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003e50mm Outside Diameter\u003c\/strong\u003e\u003c\/p\u003e \u003ch3\u003eINTAKE MANIFOLD CONNECTION:\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003e35mm Outside Diameter\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003ePlease measure your existing components before ordering.\u003c\/p\u003e \u003cp\u003eThis is especially important when using aftermarket intake manifolds and air filters.\u003c\/p\u003e FACTORY JETTING \u003cp\u003eThe KOSO KSR 28mm comes configured with:\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eMain Jet — #100\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eSlow \/ Pilot Jet — #40\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003ePower Jet — #30\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eJet Needle — J\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eNeedle Position — Position 3\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eAir Adjustment Screw — 1-1\/2 Turns Baseline\u003c\/strong\u003e\u003c\/p\u003e CARBURETOR TUNING MAY BE REQUIRED \u003cp\u003ePerformance carburetors are designed to be tuned to the specific engine.\u003c\/p\u003e \u003cp\u003eThe factory jetting is a \u003cstrong\u003estarting point and is not guaranteed to be the correct final jetting for your application.\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eRequired jetting can change significantly depending on:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003eEngine displacement\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eCylinder bore\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eCompression ratio\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eCylinder head\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eValve size\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eCamshaft\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eIntake manifold\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eAir filter\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eExhaust system\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eElevation\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eTemperature\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eOther engine modifications\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eProper air\/fuel tuning is important for both \u003cstrong\u003eperformance and engine reliability\u003c\/strong\u003e.\u003c\/p\u003e KOSO KSR VS. STOCK CV-STYLE CARBURETOR \u003cp\u003eA standard CV-style GY6 carburetor is primarily designed around smooth operation, fuel economy, and everyday drivability.\u003c\/p\u003e \u003cp\u003eThe \u003cstrong\u003eKOSO KSR is designed with performance tuning in mind.\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eIts semi-flat D-shaped slide and adjustable fuel system allow a performance engine builder to tune the carburetor around the engine's airflow requirements.\u003c\/p\u003e \u003cp\u003eFor modified engines, this can provide:\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eSharper throttle response\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eBetter fuel delivery\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eIncreased tuning capability\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eBetter support for higher-flowing engine combinations\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eImproved performance potential\u003c\/strong\u003e\u003c\/p\u003e IDEAL FOR BIG-BORE \u0026amp; PERFORMANCE ENGINES \u003cp\u003eInstalling a larger cylinder, performance cylinder head, camshaft, intake, or exhaust can increase the amount of air an engine is capable of moving.\u003c\/p\u003e \u003cp\u003eAt a certain point, the original carburetor can become a restriction.\u003c\/p\u003e \u003cp\u003eA properly sized and tuned \u003cstrong\u003e28mm performance carburetor\u003c\/strong\u003e can help provide the additional airflow and fuel delivery needed to take advantage of those engine modifications.\u003c\/p\u003e \u003cp\u003eThe KOSO KSR is an excellent choice for builders looking to move beyond a basic stock carburetor.\u003c\/p\u003e IMPORTANT FITMENT INFORMATION \u003cp\u003e\u003cstrong\u003eTHIS IS A PERFORMANCE CARBURETOR AND IS NOT GUARANTEED TO BE A DIRECT BOLT-ON REPLACEMENT FOR EVERY VEHICLE.\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eBefore ordering, please verify:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003e35mm Intake Manifold Connection\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003e\u003cstrong\u003e50mm Air Filter Connection\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eThrottle cable compatibility\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eChoke\/enricher configuration\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eFuel line configuration\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eAvailable installation clearance\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp\u003eYour engine is a \u003cstrong\u003e4-stroke application\u003c\/strong\u003e\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eAn aftermarket intake manifold, air filter, throttle cable, jets, or other components may be required depending on your particular vehicle.\u003c\/p\u003e IMPORTANT \u003ch3\u003eFOR 4-STROKE ENGINES ONLY\u003c\/h3\u003e \u003cp\u003eThe KOSO KSR carburetor is designed for \u003cstrong\u003e4-stroke applications\u003c\/strong\u003e.\u003c\/p\u003e \u003cp\u003eIt should not be purchased solely based on vehicle brand, engine displacement, or appearance.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003ePLEASE COMPARE THE SPECIFICATIONS AND CONNECTION DIMENSIONS WITH YOUR EXISTING SETUP BEFORE ORDERING.\u003c\/strong\u003e\u003c\/p\u003e \u003ch2\u003ePACKAGE INCLUDES\u003c\/h2\u003e \u003cp\u003e\u003cstrong\u003e1 x KOSO KSR 28mm Performance Carburetor\u003c\/strong\u003e\u003c\/p\u003e \u003ch3\u003eKOSO KSR 28mm\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003ePERFORMANCE AIR\/FUEL DELIVERY • SEMI-FLAT D-SHAPED SLIDE • BUILT FOR SERIOUS CVT \u0026amp; 4-STROKE PERFORMANCE\u003c\/strong\u003e\u003c\/p\u003e","brand":"ChinesePartsPro","offers":[{"title":"Default Title","offer_id":53556436009272,"sku":"128-19-28","price":128.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0011\/8898\/6997\/files\/128-19.main.04__32687.1656529517.jpg?v=1792868970","url":"https:\/\/www.chinesepartspro.com\/products\/gy6s-128-19-28-koso-ksr-28mm-carburetor-features-a-semi-flat-d-shaped-slide-for-gy6-scooters","provider":"ChinesePartsPro","version":"1.0","type":"link"}