{"product_id":"kitaco-88cc-big-bore-up-kit-chrome-cylinder-version-suitable-for-use-with-z50j-6v-st50-dax-6v","title":"Kitaco 88cc BIG Bore-Up Kit *Chrome Cylinder Version* suitable for use with Z50J 6V, ST50 Dax 6V","description":"\u003cp dir=\"auto\"\u003eThis kit is compatible with the following Honda models and frame number ranges:\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMonkey \/ Gorilla\u003c\/strong\u003e: Z50J-1000001～1323946 and Z50J-1323947～1510400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDax 50 (6V)\u003c\/strong\u003e: ST50-1000001～6299999 and ST50-6300022～6346265\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChaly 50\u003c\/strong\u003e: CF50-1000001～2899999\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCD50\u003c\/strong\u003e: CD50-1100001～1330600\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eThis premium \u003cstrong\u003e88cc STD-Type2 Big Bore Kit\u003c\/strong\u003e from Kitaco is engineered for Honda Monkey, Gorilla, and the compatible models listed above. It delivers strong, usable power and torque improvements throughout the RPM range while remaining well-suited for everyday street riding.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eKit Contents \u0026amp; Performance Features\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThe kit includes a high-durability cylinder head featuring an optimized combustion chamber, improved port shapes, larger valves, a high-lift camshaft, and a high-compression cast piston. These components work together to enhance airflow and combustion efficiency, resulting in noticeably better low- to mid-range torque and improved top-end performance compared to the stock setup.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eKey specifications:\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eDisplacement: 88cc\u003c\/li\u003e\n\u003cli\u003eBore: φ52mm\u003c\/li\u003e\n\u003cli\u003eStroke: 41.4mm (retains the stock crankshaft)\u003c\/li\u003e\n\u003cli\u003ePre-assembled valves in the cylinder head\u003c\/li\u003e\n\u003cli\u003eHigh-compression piston matched to the combustion chamber\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 dir=\"auto\"\u003eThe Key Difference: All-Aluminum Hard Chrome Cylinder\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThis specific version features Kitaco’s premium \u003cstrong\u003eall-aluminum hard chrome cylinder\u003c\/strong\u003e. It differs from the standard version of the kit, which uses an aluminum cylinder block with a traditional cast iron sleeve.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eBenefits of the Hard Chrome Cylinder:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior durability and wear resistance\u003c\/strong\u003e: The hard chrome plating is applied directly to the aluminum bore, creating an extremely tough, low-friction surface. This significantly reduces wear from the piston rings compared to a conventional cast iron sleeve, helping the engine maintain performance longer and extending overall engine life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved heat dissipation\u003c\/strong\u003e: The full aluminum construction (without a heavy iron sleeve) allows heat to transfer away from the combustion chamber more efficiently. This helps keep the engine running cooler — especially beneficial for air-cooled bikes during extended rides or in warmer conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced weight\u003c\/strong\u003e: Removing the iron sleeve lightens the cylinder assembly slightly, contributing to a better power-to-weight ratio and sharper engine response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoother operation\u003c\/strong\u003e: The hard chrome surface offers excellent low-friction properties, promoting smoother piston movement, reduced internal drag, and improved sealing over time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eIn summary, choosing the hard chrome cylinder version gives you a higher-end, more durable upgrade that runs cooler and lasts longer, making it ideal for riders who want reliable performance from their big bore conversion.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThis kit is a great choice for enthusiasts seeking a meaningful power increase without sacrificing street usability. For best results, we recommend using high-quality engine oil, correct carburetor jetting, and following proper break-in procedures. Professional installation is advised, and always verify compatibility with your specific model and year.\u003c\/p\u003e","brand":"Kitaco","offers":[{"title":"Default Title","offer_id":58195017957763,"sku":"215-1014202","price":325.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0202\/7464\/files\/215-1014202.jpg?v=1780751684","url":"https:\/\/www.shirebikes.co.uk\/products\/kitaco-88cc-big-bore-up-kit-chrome-cylinder-version-suitable-for-use-with-z50j-6v-st50-dax-6v","provider":"Shire Bikes - Parts \u0026 Accessories suitable for Monkey Bikes","version":"1.0","type":"link"}