Aftermarket Dirt Bike Parts & Race Components

The AS3 Performance Heavy-Duty Aluminum Bash Plate is a rugged, full-coverage protective skid plate engineered in the UK to shield engine cases, water pump covers, oil pumps, and frame rails from devastating impacts in extreme off-road, hard enduro, and motocross environments. A single rock strike can crack cast magnesium engine cases, causing rapid oil loss and catastrophic engine seizure. The AS3 Performance bash plate delivers impenetrable protection across the most hostile terrains.

The AS3 Performance Braided Stainless Steel Brake Line Kit is a safety-critical hydraulic braking upgrade engineered to eliminate the spongy, vague brake lever feel caused by standard factory rubber brake hoses. Stock rubber brake lines expand elastically under hydraulic pressure, especially when brake fluid heats up during aggressive riding. This volumetric expansion wastes valuable hydraulic master cylinder pressure, resulting in excessive lever travel, reduced braking power, and inconsistent bite points into turns.

The AS3 Performance Forged Front Brake Lever is a high-strength replacement brake control component engineered to deliver outstanding reliability, precise hydraulic modulation, and superior crash resistance compared to brittle cast aluminum OEM levers. Standard cast levers possess internal porosity that causes catastrophic fracturing during low-speed washouts or roost impacts. AS3 Performance eliminates this vulnerability by forging the lever blade from high-density 6061-T6 aluminum alloy before CNC finish-machining, aligning the grain structure of the metal to provide immense tensile strength and elastic resilience.

The Acerbis Carbon Fiber Skid Plate is an ultra-lightweight, maximum-protection engine and frame shield engineered for competitive motocross and off-road racing. Standard cast or stamped aluminum skid plates are heavy, transmit harsh engine vibration directly into the chassis, and alter frame flex characteristics, causing the bike to feel stiff and unforgiving in rough chop. Plastic skid plates, while flexible, can crack when struck at high speed by sharp boulders. The Acerbis Carbon Fiber Skid Plate delivers the ultimate fusion of extreme structural stiffness, featherweight mass, and superior impact defense.

The Acerbis Full Plastic Kit (OEM Colors / Manufacturer Part 2198000438 application) is the world's leading factory-replica bodywork kit engineered to replace scratched, cracked, or UV-faded stock motorcycle plastics with a brand-new showroom finish. Acerbis has manufactured premier off-road bodywork in Italy for over five decades and serves as the official OEM plastic supplier to top factory racing teams. Whether you are rebuilding a tired race bike, restoring a bike after a crash, or changing colorways (available in factory OEM color matches, stealth full-black editions, original 02 vintage schemes, and classic original 08 team hues), Acerbis kits deliver factory-spec precision.

The Acerbis X-Grip Frame Guards are innovative dual-injected protective chassis components engineered to replace thin adhesive frame tape and protect exposed aluminum and steel frame spars from boot rub, gravel abrasion, and rock gouges. Modern motocross boots with heavy-duty hinged plastic buckles and metal ankle pivots quickly grind through frame paint and wear deep structural grooves into aluminum frame rails. The X-Grip solves this by providing tough physical protection while significantly enhancing rider machine control.

The Boyesen Rad Valve System is a complete, high-performance aerodynamic intake and reed valve assembly engineered to replace restrictive OEM reed blocks on modern two-stroke motocross and off-road motorcycles. Factory reed blocks feature flat, boxy intake runners that create severe boundary-layer turbulence, dead air pockets, and uneven fuel distribution across the intake tract. The Boyesen Rad Valve eliminates this restriction with a one-piece cast aluminum housing featuring aerodynamic surface profiling and multi-stage aerospace carbon reed petals.

The Boyesen Supercooler Water Pump Kit is a championship-winning thermal management upgrade engineered to replace restrictive OEM water pump covers and stamped impellers on modern four-stroke and two-stroke motocross engines. High-revving competition four-strokes generate massive thermal loads; under heavy race conditions or tight mud tracks, factory water pumps create severe hydrodynamic cavitation—microscopic vapor bubbles that collapse and prevent coolant from contacting the cylinder walls, leading to rapid boiling, horsepower loss from thermal expansion, and head gasket failure.

The D.I.D 520 ERT3 Non O-Ring Gold Chain is the premier lightweight competition drive chain engineered specifically for world-class Supercross, AMA Pro Motocross, and high-performance closed-course racing. Replacing heavy, drag-inducing sealed chains or low-grade OEM non-sealed chains, the ERT3 is optimized to deliver maximum horsepower transfer to the rear wheel with the lowest possible rotating inertia and frictional resistance. D.I.D is the factory chain choice for elite teams worldwide, and the ERT3 represents their highest non-sealed racing specification.

The D.I.D 520 VT2 X-Ring Enduro Gold Chain (Enduro Narrow Series) is the ultimate heavy-duty sealed drive chain engineered specifically for off-road, enduro, cross-country, and dual-sport motorcycles. Many standard sealed O-ring chains are too wide for compact motocross-based enduro chassis, causing the chain side plates to rub against the engine case, front chain guide, or rear tire. D.I.D solved this clearance issue by designing the VT2 with a specialized narrow profile that delivers all the longevity of a sealed chain within the slim width of a non-O-ring chain.

The Dunlop Geomax AT81 Enduro Rear Tire is the undisputed industry standard for cross-country, GNCC, and hard enduro off-road competition. Engineered specifically to replace motocross-specific tires that bounce off rocks and chunk knobs in technical woods terrain, the AT81 features a specialized off-road carcass design and an ultra-durable rubber compound formulated to conquer jagged roots, slick river rocks, mud bogs, and hard-packed logging roads.

The Dunlop Geomax MX34 Front Tire (size 80/100-21) is a cutting-edge soft-to-intermediate motocross and off-road front tire engineered to replace standard OEM front rubber with exceptional cornering grip, precise line-holding capability, and predictable slide recovery. Designed as the direct successor to the championship-proven MX33, the MX34 introduces an updated casing construction and an advanced tread block architecture that delivers superior feedback when leaning into hard-packed ruts or traversing loose topsoil over hard base.

The Dunlop Geomax MX34 Rear Tire (size 110/90-19) is an elite soft-to-intermediate motocross rear tire engineered to replace worn stock tires with hole-shot-winning acceleration, aggressive braking bite, and class-leading corner-exit traction. Designed specifically for 250cc and 450cc motocross machines utilizing 19-inch rear wheels, the MX34 builds upon Dunlop's factory racing heritage with an updated tread block pattern that evacuates mud efficiently while generating immense mechanical drive out of soft berms and deep ruts.

The FMF Factory 4.1 RCT Titanium Slip-On Silencer is a premier competition exhaust upgrade engineered to replace heavy, restrictive OEM four-stroke mufflers with an ultralight, race-calibrated sound and power solution. Incorporating FMF's patented Resonance Chamber Technology (RCT), the internal core geometry reduces sound output while optimizing pressure waves to expand power output across the entire RPM range. By positioning the internal core closer to the engine and utilizing an aggressive series of internal orifices, the 4.1 RCT shortens overall canister length, concentrating exhaust mass closer to the motorcycle's center of gravity for improved chassis handling in corners.

The FMF Gnarly 2-Stroke Exhaust Pipe is the legendary heavy-duty expansion chamber engineered for modern two-stroke motocross and enduro riders who demand rugged rock impact protection and enhanced low-to-midrange torque delivery. Standard OEM two-stroke pipes are stamped from lightweight 20-gauge or 22-gauge steel, leaving them extremely vulnerable to roost dents, boulder crushes, and log strikes that restrict exhaust airflow and ruin engine performance. The FMF Gnarly resolves this by utilizing rugged, heavy-duty 18-gauge steel construction throughout the entire chamber body.

The FMF Megabomb Titanium Header is a patented, high-performance exhaust header engineered to replace straight-pipe OEM headers, unlocking significant mid-to-top end power gains while lowering exhaust decibel output. The defining engineering feature of the Megabomb is its enlarged secondary expansion module located along the primary pipe. This scientifically calculated chamber acts as an acoustic diffuser and exhaust pulse resonator, allowing high-velocity exhaust gases to expand and decelerate momentarily before converging back into the main stream.

The Flo Motorsports Folding Clutch Lever is an essential durability upgrade engineered to replace brittle cast OEM clutch levers that frequently snap off during minor spills and tip-overs. CNC-machined from aircraft-grade 6061-T6 billet aluminum, this lever features a precision spring-loaded pivot mechanism that allows the blade to fold outward and forward 90 degrees during an impact, absorbing the kinetic energy and instantly springing back to its functional position once the bike is picked up.

The Flo Motorsports Pro Series Footpegs are high-grade aftermarket footpegs designed to replace narrow, slippery OEM steel pegs that pack with mud and offer inadequate platform stability. Machined from solid aerospace-grade 7075-T6 billet aluminum, these pegs provide an exceptionally strong, lightweight foundation that withstands massive casing impacts and aggressive riding without bending or snapping. Measuring a generous 57mm wide by 86mm long, the wide platform dramatically increases the contact patch between the rider's boot sole and the machine.

The Flo Motorsports Pro Series Radiator Braces are essential heavy-duty protection components engineered to safeguard expensive, fragile aluminum radiators from catastrophic crushing and bending during tip-overs, side impacts, and tree strikes. Motorcycle radiators are constructed from delicate brazed aluminum with ultra-thin cooling fins; a minor crash can twist the core, rupture the coolant tank, and end your riding day with an overheated engine. Flo Motorsports braces provide an impenetrable structural roll-cage around your radiators.

The Galfer Rear Wave Solid Brake Rotor is a high-performance, heat-dissipating rear brake disc engineered to replace solid OEM rear rotors that suffer from overheating, brake fade, and premature pad glazing. In off-road and motocross riding, the rear brake is subjected to continuous drag and heavy modulation in tight ruts and downhill descents. Factory round rotors trap heat and pad debris, causing the hydraulic brake fluid to boil and resulting in a spongy, useless rear brake pedal. Galfer's Wave rotor design completely transforms rear braking consistency.

The Galfer Tsunami Oversized 270mm Front Rotor Kit is an elite braking performance upgrade engineered to replace standard 240mm-260mm OEM front brake rotors, providing massive stopping power, precise two-finger lever modulation, and exceptional heat dissipation. Modern four-stroke motocross and off-road bikes generate intense kinetic energy; stock solid rotors quickly overheat during aggressive downhill braking or hard moto entry, leading to lever fade, fluid boiling, and unpredictable stopping distances. The Galfer Tsunami oversized kit solves this by increasing braking leverage and cooling efficiency.

The Honda HRC Race ECU & Performance Camshaft Kit is a factory competition power package engineered directly by Honda Racing Corporation (HRC) to elevate the CRF450R and CRF450RX to professional Supercross and Pro Motocross performance levels. While stock production 450 engines are calibrated to balance EPA sound/emissions and broad amateur rideability, the HRC Race Kit reprograms the engine's fueling and ignition maps while increasing valve lift and duration for maximum competition power delivery.

The Husqvarna Factory Racing Titanium Footpegs are the ultimate lightweight, high-traction foot controls engineered directly by Husqvarna's factory racing division to replace heavy steel OEM footpegs on modern Husqvarna and KTM motorcycles. Footpegs are the primary physical interface through which a rider steers and controls the machine; standard pegs are narrow, heavy, and wear down quickly, compromising boot traction in muddy or wet racing conditions.

The KTM SXS Factory Adjustable Offset Triple Clamps are an elite factory racing chassis upgrade engineered to replace cast OEM triple clamps, providing tunable steering geometry, enhanced front-end traction, and reduced fork stiction for KTM and Husqvarna motocross and enduro motorcycles. Factory cast triple clamps are rigid and inflexible, often pinching the fork tubes under hard clamping loads and transmitting harsh vibrations into the rider's hands. KTM SXS Factory clamps solve this with CNC-machined aerospace billet aluminum and engineered flex zones.

The Kawasaki KXF Pro Circuit Suspension Linkage Arm is a precision-engineered chassis handling upgrade developed directly with the Monster Energy Pro Circuit Kawasaki factory racing team to optimize the rear suspension geometry on KX250 and KX450 motorcycles. Stock Kawasaki rear suspension linkages feature a rising-rate curve that causes the rear end to feel high, stiff, and busy over initial braking bumps, often resulting in a harsh, unsettled chassis when entering rough corners and high-speed sweepers.

The Michelin StarCross 6 Hard Rear Tire (size 110/90-19) is a specialized, ultra-durable motocross rear tire engineered for hard-packed clay, baked summer tracks, blue-groove surfaces, and stony off-road circuits where standard soft-compound tires quickly chunk knobs and lose drive. Replacing tires that wear out prematurely on abrasive ground, the StarCross 6 Hard utilizes Michelin's Silica Technology blended into an ultra-tough, high-density tread compound that resists tearing and abrasion under extreme acceleration.

The Michelin StarCross 6 Medium Soft Front Tire (size 80/100-21) represents the pinnacle of modern French off-road tire engineering, designed to replace conventional front tires with class-leading braking stability, progressive lean-angle traction, and unprecedented tread longevity. Developed alongside top FIM World Motocross Championship teams, the StarCross 6 is the first motocross tire to integrate Michelin's proprietary Silica Technology into the rubber compound matrix.

The Pro Circuit 304 Factory Sound Silencer is the benchmark two-stroke performance silencer engineered to replace heavy, restrictive stock mufflers on modern two-stroke motocross and enduro machines. Featuring a slightly longer body section than shorty supercross silencers, the 304 Factory Sound strikes the ultimate balance between crisp throttle response, broadened mid-to-top power delivery, and an iconic, crisp two-stroke exhaust note that thrills riders without producing unbearable high-frequency ear fatigue.

The Pro Circuit T-6 Stainless Steel Exhaust System delivers the exact same championship-winning power curve, stepped header architecture, and race-tuned internal geometry as the flagship Ti-6 titanium line, but is constructed from rugged, cost-effective high-grade stainless steel. Engineered as an ideal solution for privateer racers, weekend motocross competitors, and aggressive off-road riders, the T-6 provides exceptional structural durability, roost impact resistance, and maximum horsepower gains without the premium price of full titanium.

The Pro Circuit Ti-6 Pro Full Titanium Exhaust System is an uncompromising, championship-grade full racing exhaust designed to replace heavy OEM systems with a lightweight, maximum-power competition setup that meets AMA Supercross and Pro Motocross sound regulations. Developed directly in collaboration with the Monster Energy Pro Circuit Kawasaki factory racing team, the Ti-6 Pro is engineered for professional racers seeking every allowable horsepower advantage while strictly complying with the 112 dB AMA/FIM two-meter max sound test.

The ProTaper Contour 1-1/8-inch Handlebar is the most popular oversize unbraced handlebar in motocross, engineered to deliver exceptional durability and controlled flex at an accessible price point. Replacing weak 7/8-inch stock bars that bend in tip-overs, the Contour features aerospace-spec 2000-series T6 aluminum alloy with an engineered 5mm wall thickness at the clamping area that tapers gracefully to 7/8 inches at the control ends. By eliminating the crossbar, the Contour allows the aluminum structure to flex naturally, isolating the rider's upper body from repetitive micro-shocks.

The ProTaper EVO 1-1/8-inch Handlebar is a benchmark unbraced oversize handlebar engineered to replace restrictive OEM bars with a purpose-built, high-compliance steering platform. ProTaper pioneered the tapered oversize bar concept, and the EVO series represents the highest evolution of their alloy engineering. Utilizing a proprietary computer-profiled 4mm wall design, the EVO combines aerospace-grade 7000-series aluminum with exceptional tensile and yield strength ratings. The absence of a rigid crossbar enables the bar to flex dynamically along its length, dissipating track harshness before it reaches the rider's hands.

The ProTaper Micro Handlebar Kit is an innovative, purpose-designed handlebar and control system engineered specifically for youth riders and mini motocross machines ranging from 50cc to 85cc. Stock mini-bike handlebars utilize adult-sized 7/8-inch grip diameters that force young riders with smaller hands to over-grip, leading to rapid hand fatigue, diminished throttle modulation, and compromised machine control. The Micro Handlebar Kit solves this by utilizing an advanced tapered design where the grip and throttle control zones are reduced to a smaller diameter, matching the natural ergonomics of youth hands.

The ProTaper PT520 Pro Series Chain is a high-performance, non-sealed competition racing chain engineered to replace stock drive chains with a high-strength, low-friction driveline link. Designed specifically for modern motocross, supercross, and arena racing, the PT520 is constructed to withstand the brutal instantaneous torque spikes of modern fuel-injected four-strokes while minimizing frictional drag and rotational inertia.

The ProTaper Pillow Top Lite Grips are an industry-favorite vibration-damping grip designed for riders seeking maximum palm cushioning and fatigue reduction in a slim, low-profile format. While the standard Pillow Top is renowned for its thick, plush comfort, the Pillow Top Lite reduces the outer diameter slightly to accommodate riders who prefer a more direct, connected feel on the handlebar and throttle tube without sacrificing impact absorption.

The ProTaper Race Spec (RS) Aluminum Rear Sprocket is an ultralight, high-precision rear sprocket engineered to deliver minimum rotating mass, razor-sharp throttle response, and race-winning durability for competitive motocross and off-road motorcycles. Reducing unsprung rotating mass at the rear wheel provides an immediate mechanical advantage: the rear suspension reacts faster over high-speed chop, and engine power spools up with crisp urgency out of corners.

The Renthal Fatbar 1-1/8-inch Handlebar is an unbraced, profile-tapered motocross and enduro handlebar engineered to replace rigid crossbar assemblies and fragile 7/8-inch standard bars. Designed without a welded or clamped crossbar, the Fatbar relies on a computer-profiled wall thickness that tapers from 1-1/8 inches (28.6mm) at the central clamping area down to 7/8 inches (22.2mm) at the control ends. This tapered geometry allows the handlebar to flex elastically under vertical shock loads while maintaining torsional stiffness across steering inputs.

The Renthal Kevlar Half-Waffle Grips represent the pinnacle of motocross grip technology, blending the ultra-soft feel of a competition grip with the extreme longevity of composite engineering. Standard grips force riders into an unpleasant compromise: soft rubber compounds offer superb traction and vibration damping but wear out in a handful of motos, while hard compounds last all season but cause severe palm blistering and arm pump. Renthal solved this dilemma by infusing millions of microscopic DuPont Kevlar aramid resin particles into their proprietary thermoplastic elastomer matrix.

The Renthal R1 Works 520 Chain is a premium, high-strength non O-ring motocross chain engineered to deliver maximum power transfer, exceptional tensile integrity, and minimal rotating weight for competitive closed-course racing. Designed to replace standard OEM chains that stretch rapidly during initial motos, the R1 Works chain combines shot-peened alloy steel link plates with high-precision components to withstand the violent shock loads produced by modern high-horsepower four-stroke and two-stroke racing engines.

The Renthal Twinring Rear Sprocket is a revolutionary hybrid rear sprocket engineered to solve the age-old motocross dilemma: the featherweight agility of aluminum versus the multi-season longevity of heavy steel. Standard 7075 aluminum sprockets wear out quickly in mud and sand, while solid steel sprockets add significant unsprung, rotating weight that slows down suspension response and throttle acceleration. The Renthal Twinring combines the best of both worlds through a patented bi-metal construction.

The Renthal Twinwall 997 Handlebar is a premier engineered motocross handlebar designed to replace standard OEM 7/8-inch or flexible 1-1/8-inch bars that are prone to bending or transmitting excessive harshness during hard landings and square-edge impacts. Utilizing a patented tube-within-a-tube architecture, the Twinwall borrows principles from aircraft design to achieve maximum strength and controlled flex. The outer tube is extruded from 7304-T6 aluminum alloy, offering extreme resistance to mechanical damage, roost abrasion, and bending stresses, while being hard anodized to prevent corrosion. The inner tube is manufactured from ultra-high-strength 7010-T6 aerospace aluminum and hard anodized to resist wear from the throttle tube and control clamps.

The Suzuki RM-Z Works Showa Fork & Suspension Upgrade Kit is an elite suspension performance package engineered to transform the handling, plushness, and bottoming resistance of the Suzuki RM-Z250 and RM-Z450. The Suzuki RM-Z chassis is universally celebrated for having the sharpest turning geometry in motocross, but stock fork valving can feel harsh on high-speed square-edge bumps and prone to mid-stroke deflection. This Works Showa upgrade kit resolves this by replacing restrictive internal valving with genuine Works-spec hydraulic components.

The TM Designworks Baja Skid Plate is an ultra-rugged, full-coverage off-road skid plate engineered in the USA to conquer extreme rocky desert terrain, GNCC mud courses, and hard enduro obstacles. When negotiating rock gardens, boulder fields, and fallen logs, heavy aluminum skid plates easily hang up on obstacles, rattle loudly, and transmit severe impact shocks into the frame. TM Designworks resolves this with their championship-winning Return-Memory composite design.

The TM Designworks Factory Edition Rear Chain Guide is the virtually indestructible benchmark chain management system engineered to replace weak, bendable OEM aluminum and plastic chain guides. Stock chain guides utilize thin stamped aluminum outer shells that easily bend inward when struck by rocks, ruts, or logs. Once bent, the OEM guide derails the drive chain, often causing the chain to wad up around the countershaft sprocket and crack the engine cases. The TM Designworks guide completely eliminates this catastrophic failure mode.

The Twin Air Dual Stage Air Filter (2-stage air filter / two-stage air filter) is the undisputed gold standard in off-road engine filtration, engineered to replace single-layer or low-quality OEM air filters with maximum airflow and impenetrable dust protection. An engine is an air pump: a single teaspoon of fine dirt passing through a compromised filter will destroy piston rings, scour cylinder walls, and chew through intake valve seats in a matter of minutes. Twin Air pioneered the dual-stage reticulated foam air filter to eliminate this danger completely.

The Twin Air Powerflow Throttle Body & Airbox Kit is a premier intake performance upgrade engineered to replace restrictive OEM air filter cages, fragile backfire screens, and narrow intake boots with an unrestricted, maximum-airflow induction system. Modern four-stroke dirt bikes feature a restrictive wire mesh backfire screen built into the stock plastic filter cage to prevent intake flame backfires from igniting the filter. However, this dense wire screen creates severe airflow drag, reducing air velocity and choking throttle response.

The UFO Plast Complete Restyled Plastic Kit is a complete modern aesthetic transformation package engineered to update the older styling of legendary two-stroke motocross machines with sharp, aggressive, modern factory lines. Older two-stroke bikes (such as classic Yamaha YZ125 and YZ250 models) possess incredible engines and suspension, but their bulbous 2000s-era bodywork looks dated and features wide radiator shrouds that hinder modern forward-riding ergonomics. UFO Plast's Restyled kit completely modernizes the machine with sleek, contemporary bodywork that bolts directly onto the original chassis.

The UFO Plast Vented Front Fender is an advanced, aerodynamic replacement front fender engineered to provide enhanced radiator airflow and roost deflection for modern motocross and off-road motorcycles. Factory front fenders often have solid rear sections that block cooling air from reaching the radiators at speed, leading to high engine operating temperatures during hot summer motos, deep mud events, and slow technical singletrack climbs. UFO Plast solves this by incorporating functional cooling vents into the rear fender section.

The Vertex Big Bore 270cc Piston Kit is a high-performance engine upgrade engineered to transform 250cc four-stroke motocross and off-road motorcycles with a substantial increase in usable torque and low-to-midrange horsepower. Standard 250F machines require high revs to generate momentum, often demanding excessive clutch slipping in tight corners and steep hill climbs. The Vertex 270cc big bore piston expands cylinder displacement, delivering immediate low-end roll-on power and heavy mid-range torque that pulls higher gears effortlessly out of corners.

The Vertex High Compression Piston is a precision-engineered four-stroke engine component designed to replace the standard factory piston, significantly enhancing throttle snap, midrange torque, and horsepower across the rev range. By increasing static compression by 0.5 to 1.0 full point above OEM specifications through an optimized dome profile, this piston increases cylinder pressure and thermal efficiency, resulting in harder acceleration off the bottom, quicker engine spool-up, and explosive power out of corners.

The Vertex Complete Top-End Rebuild Kit is the gold-standard factory replacement package designed to restore lost compression, throttle response, and engine reliability to modern four-stroke and two-stroke motocross machines. Over 30 to 50 race hours, stock pistons suffer skirt wear, ring tension loss, and carbon buildup, leading to blow-by, oil consumption, and the catastrophic risk of piston skirt collapse that destroys cylinder walls and crankshaft assemblies. The Vertex Top-End kit provides all original equipment quality components required to complete a professional top-end overhaul in a single box.

The Wiseco Complete Bottom End Rebuild Kit is the definitive, heavy-duty solution engineered to completely overhaul worn or failed lower engine assemblies on two-stroke and four-stroke dirt bikes. When crankshaft main bearings develop radial play or the connecting rod big-end bearing begins to fail, the entire rotating assembly must be replaced before catastrophic rod breakage destroys the crankcases and cylinder. Wiseco's complete bottom-end kit provides all premium matched components required for a complete lower-end rebuild in one package.

The Wiseco Performance Forged Clutch Basket is a heavy-duty, race-proven driveline upgrade engineered to replace weak cast aluminum OEM clutch baskets that notch, groove, and fail under aggressive motocross and supercross riding. Stock cast baskets quickly develop saw-tooth notches along the clutch tang fingers from repeated clutch dumps and hard acceleration. These notches prevent clutch plates from sliding freely, causing severe clutch drag, erratic lever feel, slipping under load, and difficult neutral selection.

The Wiseco Racer Elite Piston Kit represents the pinnacle of modern American four-stroke forged piston engineering, designed for elite motocross racers and engine builders who demand maximum power output, reduced friction, and exceptional fatigue resistance. Engineered in Wiseco's advanced R&D facility in Mentor, Ohio, the Racer Elite piston is fully CNC-machined from a dedicated 2618 aerospace-grade aluminum forging, utilizing a boxed-bridge architecture that offers the highest stiffness-to-weight ratio in the off-road racing industry.

The Yamaha GYTR High-Flow CNC Ported Cylinder Head is the ultimate genuine factory performance cylinder head assembly, developed directly by Genuine Yamaha Technology Racing (GYTR) to deliver championship-winning horsepower and torque for competitive Yamaha YZ250F and YZ450F race machines. While stock cylinder heads feature mass-production cast intake and exhaust ports with casting flash and rough surface transitions, the GYTR cylinder head is precision CNC ported on a dedicated 5-axis milling machine using port geometries developed by Yamaha's factory Supercross and MXGP racing teams.