{"product_id":"for-gy6-150cc-57-4mm-big-bore-kit-set-cylinder-head-piston-gasket-set-qmj157","title":"For GY6 150cc 57.4mm Big Bore Kit Set Cylinder Head Piston Gasket Set QMJ157","description":"\u003ch2\u003eGY6 150cc Big Bore Kit Set with Cylinder Head\u003c\/h2\u003e\u003cp\u003eThis 57.4mm big bore kit set includes the cylinder, cylinder head, piston, and gasket set needed to rebuild a GY6 150cc engine, adding displacement for stronger mid-range output.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis GY6 150cc big bore kit set is a top-end rebuild package for scooters and buggies running the QMJ157 engine family. The 57.4mm big bore kit set raises displacement over the stock cylinder while the included head, piston, and gaskets let you complete the job in one pass. It suits riders and small-engine mechanics rebuilding a worn or underpowered 150cc top end.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e57.4mm cylinder bore that increases displacement over the stock 150cc cylinder\u003c\/li\u003e\n\u003cli\u003eCylinder head matched to the GY6 150cc top end\u003c\/li\u003e\n\u003cli\u003ePiston and ring set sized for the 57.4mm bore\u003c\/li\u003e\n\u003cli\u003eComplete gasket set for sealing the cylinder, head, and covers\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder construction for heat dissipation under load\u003c\/li\u003e\n\u003cli\u003eKit format that covers the main wear parts in a single order\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor GY6 150cc scooters using the QMJ157 engine\u003c\/li\u003e\n\u003cli\u003efor 150cc buggies using the QMJ157 engine\u003c\/li\u003e\n\u003cli\u003efor 150cc ATV models using the GY6 engine family\u003c\/li\u003e\n\u003cli\u003efor QMJ157 based go-karts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds on high-mileage 150cc scooters\u003c\/li\u003e\n\u003cli\u003eRestoring compression on a smoking or hard-starting engine\u003c\/li\u003e\n\u003cli\u003eBuggies and karts run hard on trails and dirt tracks\u003c\/li\u003e\n\u003cli\u003eDaily rider scooters that need dependable mid-range power\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e57.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplacement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e150cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Family\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGY6 QMJ157\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKit Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCylinder, cylinder head, piston, gasket set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this big bore kit set need any machine work to install? \u003cstrong\u003eA:\u003c\/strong\u003e The cylinder comes ready to bolt on, but checking piston-to-wall clearance and ring end gap before assembly is good practice on any rebuild. \u003cstrong\u003eQ:\u003c\/strong\u003e Can I run the stock carburetor with the GY6 150cc big bore kit set? \u003cstrong\u003eA:\u003c\/strong\u003e The engine will start and run, but a rejet or larger carb is often needed to get full benefit from the added displacement.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":50556942909526,"sku":"ZZ3P01098","price":142.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_3964c4d3-5afc-41cd-b565-5e84db49cb16.jpg?v=1790955634","url":"https:\/\/www.solidspare.com\/products\/for-gy6-150cc-57-4mm-big-bore-kit-set-cylinder-head-piston-gasket-set-qmj157","provider":"Solid Spare","version":"1.0","type":"link"}