{"product_id":"scooterworks-big-bore-kit-63mm-180cc-gy6-150-1100-1438","title":"RDLN GY6 Big Bore Kit 180cc - 63mm","description":"\u003cp\u003eUnlock maximum displacement from your power plant with the \u003cstrong\u003eRDLN 180cc Big Bore Cylinder Kit\u003c\/strong\u003e. Engineered to push the standard 150cc GY6 platform to its absolute performance limit, this kit features an oversized 63mm ceramic-composite coated cylinder bore. Delivering a massive increase in low-end torque and mid-range hill-climbing power, it is the ultimate upgrade for competitive track builds, high-load utility ATVs, and off-road go-karts.\u003c\/p\u003e\u003cdiv style=\"background-color: #fff4f4; padding: 15px; border-left: 5px solid #d9534f; margin: 20px 0;\"\u003e\n\u003cstrong\u003eCRITICAL INSTALLATION WARNING:\u003c\/strong\u003e Because the cylinder sleeve outer diameter measures 64.9mm, this kit may require machined widening of your engine case to accommodate the larger sleeve. Attempting to force-fit without case modification will damage the cylinder jacket. Use our specialized \u003ca href=\"https:\/\/www.scooterworks.com\/products\/ssp-g-engine-case-boring-tool-for-gy6-150cc\"\u003eEngine Case Boring Tool (SKU: 202-37)\u003c\/a\u003e to complete this modification.\u003c\/div\u003e\u003ch3\u003eProduct Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Displacement:\u003c\/strong\u003e Boosts standard 125cc\/150cc short or long-case variants up to a true 180cc (based on stock 57.8mm stroke).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Heat Dissipation:\u003c\/strong\u003e Advanced cast alloy construction with precision cooling fins limits thermal saturation during continuous wide-open throttle (WOT) loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Top-End Package:\u003c\/strong\u003e Includes the 63mm cylinder barrel, matched light-alloy piston, performance wrist pin, dual circlips, high-tension compression rings, head gasket, and base gasket.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Bore Diameter:\u003c\/strong\u003e 63mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSleeve Outer Diameter (Skirt):\u003c\/strong\u003e 64.9mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Total Structural Height:\u003c\/strong\u003e 90.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStud Spacing Fitment:\u003c\/strong\u003e Standard 54mm engine configurations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eExpanded Model Fitment \u0026amp; Vehicle Engine Guide\u003c\/h3\u003e\u003cp\u003eThis kit fits 4-stroke, 54mm stud-spaced GY6 engine cases (Engine Codes listed below) commonly utilized across a massive variety of street scooters, off-road buggies, and heavy-duty utility carts.\u003c\/p\u003e\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color: #f8f8f8;\"\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ddd;\"\u003eApplication Category\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ddd;\"\u003eKnown Compatible Models \u0026amp; Platforms (Case Boring Required)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eOff-Road Go-Karts \/ Buggies\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eHammerhead 150cc Series (GTS150, GT150, Twister), Carter Talon 150, Trailmaster 150 XRX\/XRS, American Sportworks, Manco Helix 150\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eUTVs \u0026amp; ATVs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eTaoTao Bull 150, Rhino 150, Polaris Phoenix 200 (GY6 clone builds), SunL 150cc Utility series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eStreet \u0026amp; Sport Scooters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eGenuine Buddy 150, ZNEN 150cc, Wolf Brand 150, Ice Bear, Bintelli, Lance, Jonway, Roketa 125\/150 variants\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003eOther 150cc Engine Codes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp style=\"margin-top: 15px;\"\u003e\u003cstrong\u003eTuning Mechanic's Recommendation:\u003c\/strong\u003e To support the massive air\/fuel demands of a 180cc upgrade, you must up-jet your factory carburetor or upgrade to a high-flow 26mm–30mm performance carburetor setup. For the ultimate pairing, consider matching this kit with a high-performance A9 or A12 camshaft to extract optimal top-end valve lift cycle coefficients.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.p65warnings.ca.gov\" target=\"_blank\"\u003eCalifornia Prop 65 Warning\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003eOriginal Parts For Scooters SKU 164-310\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Scooterworks","offers":[{"title":"Default Title","offer_id":48112159555771,"sku":"1100-1438","price":127.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/1340\/6651\/files\/1100-1438_6e3c871f-9e80-4cec-96eb-885b578e8a7f.jpg?v=1784303620","url":"https:\/\/thriftyscooters.com\/products\/scooterworks-big-bore-kit-63mm-180cc-gy6-150-1100-1438","provider":"Thrifty Scooters","version":"1.0","type":"link"}