{"product_id":"170cc-big-bore-cylinder-kit-with-4-valve-cylinder-head","title":"170cc Big Bore Cylinder Kit with 4-Valve Cylinder Head","description":"The Koso MB623003 is a comprehensive 170cc big bore kit designed to significantly upgrade the engine performance of compatible Honda Grom and Monkey motorcycles. This kit elevates your bike's capabilities with a 4-valve cylinder head and enhanced internals.\n\nThe kit includes a Koso ceramic-coated big bore cylinder, a forged piston, a performance camshaft, a camshaft bearing, and rocker arms. The centerpiece is the complete 4-valve cylinder head, which features optimized airflow and is equipped with 24mm intake valves and 20mm exhaust valves. All necessary gaskets are provided to ensure a proper seal during installation.\n\nInstallation of this kit should only be performed by professional mechanics to avoid engine damage. Careful adherence to the provided instructions is crucial for correct assembly. Additionally, this product is not CARB approved and cannot be shipped to California. It is intended for race use only in California, with a waiver available.","brand":"Koso","offers":[{"title":"Default Title","offer_id":52686546043192,"sku":"MB623003","price":1039.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/657806043.jpg?v=1784874773","url":"https:\/\/store.motormia.co\/products\/170cc-big-bore-cylinder-kit-with-4-valve-cylinder-head","provider":"MOTORMIA","version":"1.0","type":"link"}