{"title":"Top End Kits","description":null,"products":[{"product_id":"wossner-dual-ring-piston-kit-kawasaki-kx500-1989-2004","title":"Wossner Dual Ring Piston Kit Kawasaki KX500 1989-2004","description":"\u003cp\u003eHigh quality forged Dual ring piston kit for the 1989-2004 KX500 platform. Wossner pistons are the best option for any big bore two stroke! \u003c\/p\u003e\n\u003cp\u003eStandard and oversized options available- select the option that meets your needs.\u003c\/p\u003e","brand":"Two Strokes Only","offers":[{"title":"STD","offer_id":44152813158679,"sku":"","price":207.57,"currency_code":"USD","in_stock":true},{"title":"0.50MM","offer_id":44152813191447,"sku":"","price":207.57,"currency_code":"USD","in_stock":true},{"title":"1.00MM","offer_id":44152813224215,"sku":"","price":207.57,"currency_code":"USD","in_stock":true},{"title":"2.00MM","offer_id":44152813256983,"sku":"","price":223.82,"currency_code":"USD","in_stock":true},{"title":"4.00MM","offer_id":44152813289751,"sku":"","price":225.98,"currency_code":"USD","in_stock":true},{"title":"5.00MM","offer_id":44152813322519,"sku":"","price":205.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/3818\/7543\/products\/kx500wossnerpiston.jpg?v=1670611226"},{"product_id":"1984-2001-honda-cr500-wiseco-forged-piston-kit-89-0mm-871m08900","title":"1984-2001 Honda CR500 Wiseco Forged Piston Kit 89.0mm 871M08900","description":"\u003cdiv class=\"mb-3\"\u003e\n\u003cdiv class=\"text-muted-foreground leading-relaxed text-sm md:text-base\"\u003e\n\u003cp\u003eWiseco leads the performance aftermarket by producing the highest quality forged pistons for Dirt Bikes, ATVs, Snowmobiles, Marine Vehicles, and Motorcycles right here in the USA. Wiseco is unique because we forge all of our pistons in-house, and produce all of our forge toolings right here in the USA. This allows us to control all aspects of our manufacturing process from raw bar to skirt coating finished parts. In addition, in-house dyno testing gives Wiseco the ability to develop state-of-the-art technology such as new shapes, coatings, and components, and lead the industry through rigorous R\u0026amp;D. Linking all segments of Wiseco's organization through design, testing, manufacturing, and distribution allows us to fulfill market needs with minimum lead-times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mb-3 features\"\u003e\n\u003ch2 class=\"font-heading font-bold text-xl md:text-2xl mb-3 text-foreground\"\u003eFeatures\u003c\/h2\u003e\n\u003cdiv class=\"prose prose-sm md:prose-base max-w-none text-foreground prose-headings:text-foreground prose-strong:text-foreground prose-li:text-muted-foreground prose-p:text-muted-foreground prose-ul:my-2 prose-li:my-1\"\u003e\n\u003cul\u003e\n\u003cli\u003eTop End Piston Gasket Kit includes: piston, rings, wrist pin, clips, top end bearing (2 strokes), and gasket kit\u003c\/li\u003e\n\u003cli\u003eEach piston is built from race proven designs that are chosen by the top race teams in all forms of racing including Supercross, Motocross, GNCC, Superbike, and more\u003c\/li\u003e\n\u003cli\u003ePK kits from Wiseco feature a complete top end gasket kit that gives you everything you need to complete your rebuild from premium materials\u003c\/li\u003e\n\u003cli\u003eDedicated forgings used for superior strength to weight ratio utilizing aerospace alloy\u003c\/li\u003e\n\u003cli\u003eHigh Performance ring kit and alloy pin included with each piston kit for extended life and sustained power\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Wiseco","offers":[{"title":"Default Title","offer_id":53027155018007,"sku":null,"price":238.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/3818\/7543\/files\/cr500wiseco.jpg?v=1777857721"},{"product_id":"2003-2023-yamaha-yz250-complete-engine-rebuild-kit-vertex-wr101082","title":"Vertex Wrench Rabbit Complete Engine Rebuild Kit (WR101-082) | Yamaha YZ250\/X (03-24)","description":"\u003cp\u003eComplete engine rebuild kit engineered to provide all the internal components needed to overhaul your two-stroke motor in one convenient package. Includes a fully assembled heavy-duty crankshaft, matched piston kit, complete bottom end main bearings, transmission bearings, and a full gasket and oil seal kit.\u003c\/p\u003e\n\u003ch3\u003eSpecs \u0026amp; Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eManufacturer Part Number:\u003c\/b\u003e WR101-082\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBrand:\u003c\/b\u003e Vertex \/ Wrench Rabbit\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eComponent Type:\u003c\/b\u003e Complete Engine Rebuild Kit (Crankshaft, Piston, Bearings, Seals, Gaskets)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial \u0026amp; Construction:\u003c\/b\u003e Premium OEM-spec and heavy-duty aftermarket alloy components\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTwo-Stroke Vehicle Fitment\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMake\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eYear Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eYamaha\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eYZ250\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTwo-Stroke Motocross\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2003–2024\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eYamaha\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eYZ250X\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTwo-Stroke Off-Road \/ Enduro\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2016–2024\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eTSO Garage Note\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe ultimate time-saver when you're tearing down a tired two-stroke engine for a full ground-up refresh. Instead of chasing down individual part numbers for bearings, seals, gaskets, and a crank, everything you need to bring your Yamaha YZ250 bottom and top end back to factory tolerances arrives in a single box.\u003c\/p\u003e","brand":"Vertex","offers":[{"title":"Default Title","offer_id":54546573328663,"sku":"WR101-082","price":719.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/3818\/7543\/files\/yzzvertexkit.png?v=1785130244"},{"product_id":"standard-bore-cylinder-kit","title":"Cylinder Works Standard Bore Cylinder Kit (422-50014K02 \/ CW50014K02) | KTM \/ Husqvarna \/ GasGas 125 (2018-2023)","description":"\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"markdown markdown-main-panel enable-luminous-fast-follows enable-updated-hr-color md-content stronger tutor-markdown-rendering\" id=\"model-response-message-contentr_59192d5ca0d991fa\" dir=\"ltr\"\u003e\n\u003cp\u003eComplete high-performance standard bore cylinder kit engineered to deliver a comprehensive, ready-to-install top-end refresh for modern high-revving two-stroke motocross and off-road engines. Features a premium cast aluminum cylinder finished with a durable nickel silicon carbide (NSC) electroplate bore and diamond honed to exact specifications, paired with a matching Vertex piston kit, top-end gaskets, and wrist pin bearing to ensure optimal ring seal, reduced friction, and superior heat dissipation under aggressive racing conditions.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs \u0026amp; Details\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eManufacturer Part Number:\u003c\/b\u003e 422-50014K02\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAlternative Part Number:\u003c\/b\u003e Cylinder Works CW50014K02\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eKit Type:\u003c\/b\u003e Complete Standard Bore Cylinder, Piston, Gasket, and Bearing Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBore Size:\u003c\/b\u003e Standard (54.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial \u0026amp; Construction:\u003c\/b\u003e Cast aluminum cylinder with nickel silicon carbide plating, matched with a Vertex #23928 piston\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTwo-Stroke Vehicle Fitment\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"horizontal-scroll-wrapper\"\u003e\n\u003cdiv class=\"table-block-component\"\u003e\n\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\n\u003cdiv class=\"table-block has-export-button new-table-style has-scrollbar is-at-scroll-start\"\u003e\n\u003cdiv class=\"table-content md-content\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan\u003eMake\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eEngine Type\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eYear Range\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eKTM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e125 SX\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTwo-Stroke Motocross\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2018–2022\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eKTM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e125 XC\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTwo-Stroke Cross-Country\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2021–2022\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHusqvarna\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTC 125\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTwo-Stroke Motocross\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2018–2022\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eGasGas\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMC 125\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTwo-Stroke Motocross\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2021–2023\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-footer hide-on-print hide-from-message-actions\"\u003e\n\u003c!----\u003e\u003c!----\u003e\u003cbutton class=\"mdc-icon-button mat-mdc-icon-button mat-mdc-button-base mat-badge mat-unthemed mat-badge-overlap mat-badge-above mat-badge-after mat-badge-small mat-badge-hidden ng-star-inserted\"\u003e\u003cspan class=\"mat-mdc-button-persistent-ripple mdc-icon-button__ripple\"\u003e\u003c\/span\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003cspan class=\"mat-focus-indicator\"\u003e\u003c\/span\u003e\u003cspan class=\"mat-mdc-button-touch-target\"\u003e\u003c\/span\u003e\u003c\/button\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003e\u003cstrong\u003eTSO Garage Note\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThere's the updated revision for the later second-generation carbureted Austrian 125 block. While the earlier 2016–2017 kits handled the introductory layout, part number \u003cb\u003e422-50014K02\u003c\/b\u003e picks up right where they left off to cover the \u003cb\u003e2018–2022 KTM\/Husqvarna\u003c\/b\u003e and \u003cb\u003e2021–2023 GasGas\u003c\/b\u003e variants. Bundling the correct Vertex piston configuration, gaskets, and wrist pin bearing, it drops straight into the crankcases without machine work, making it an efficient way to restore peak compression and crisp throttle snap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!----\u003e\n\u003c\/div\u003e","brand":"CYLINDER WORKS","offers":[{"title":"Default Title","offer_id":54553863487767,"sku":"422-50014K02","price":1187.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/3818\/7543\/files\/efed-6a56a0c06e419.jpg?v=1785216380"},{"product_id":"standard-bore-cylinder-kit-1","title":"Cylinder Works Standard Bore Cylinder Kit (422-50014K01 \/ CW50014K01) | KTM 125 SX \/ Husqvarna TC 125 (2016-2017)","description":"\u003cp\u003eComplete high-performance standard bore cylinder kit engineered to deliver a comprehensive, ready-to-install top-end refresh for modern high-revving two-stroke motocross engines. Features a premium cast aluminum cylinder finished with a durable nickel silicon carbide (NSC) electroplate bore and diamond honed to exact specifications, paired with matching top-end components to ensure optimal ring seal, reduced friction, and superior heat dissipation under aggressive racing conditions.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecs \u0026amp; Details\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eManufacturer Part Number:\u003c\/b\u003e 422-50014K01\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAlternative Part Number:\u003c\/b\u003e Cylinder Works CW50014K01\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eKit Type:\u003c\/b\u003e Complete Standard Bore Cylinder, Piston, and Gasket Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBore Size:\u003c\/b\u003e Standard (54.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial \u0026amp; Construction:\u003c\/b\u003e Cast aluminum cylinder with nickel silicon carbide plating, matched with Vertex #23928 piston components\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTwo-Stroke Vehicle Fitment\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMake\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eYear Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eKTM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e125 SX\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTwo-Stroke Motocross\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2016–2017\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHusqvarna\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTC 125\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTwo-Stroke Motocross\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2016–2017\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eTSO Garage Note\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eSpot on—sharp eye catching that. The official manufacturer data restricts part number \u003cb\u003e422-50014K01\u003c\/b\u003e strictly to the \u003cb\u003e2016–2017\u003c\/b\u003e models (utilizing the specific Vertex #23928 piston configuration). Trying to cross-pollinate this casting into later model years will cause layout and port timing mismatches. Always verify your exact production year before teardown to guarantee a correct match.\u003c\/p\u003e","brand":"CYLINDER WORKS","offers":[{"title":"Default Title","offer_id":54553865519383,"sku":"422-50014K01","price":1187.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/3818\/7543\/files\/4175-6a56a18fdecfa.jpg?v=1785216384"},{"product_id":"standard-bore-cylinder-kit-2","title":"Cylinder Works Standard Bore Cylinder Kit (422-50013K01 \/ CW50013K01) | KTM 85 SX \/ Husqvarna TC 85 \/ GasGas MC 85 (2018-2025)","description":"\u003cp\u003eComplete high-performance standard bore cylinder kit engineered to deliver a comprehensive, ready-to-install top-end refresh for high-revving junior two-stroke engines. 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Because the cylinder drops straight into the stock cases with no machine work required, it's an efficient way to unlock a whole new level of performance during a standard top-end rebuild.\u003c\/p\u003e","brand":"CYLINDER WORKS","offers":[{"title":"Default Title","offer_id":54553878921495,"sku":"422-21009K","price":1195.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0687\/3818\/7543\/files\/14a8-6a5e8392492e5.jpg?v=1785216430"},{"product_id":"cylinder-kit-66-40-std-yam-1","title":"Cylinder Works Standard Bore Cylinder Kit (422-20009K \/ 20009-K01) | Yamaha YZ250 (1999-2025)","description":"\u003cp\u003eComplete high-performance standard bore cylinder kit engineered to deliver a comprehensive, ready-to-install top-end refresh for legendary two-stroke motocross engines. 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