{"product_id":"koso-north-america-4-valve-cylinder-head-kit-grom-monkey-13-20","title":"Koso North America 4V Head Kit Honda Grom","description":"\u003cp\u003eKOSO NORTH AMERICA 4 VALVE CYLINDER HEAD KIT GROM\/MONKEY 13-20\u003c\/p\u003e\n\u003cdiv class=\"et_pb_module et_pb_text et_pb_text_3  et_pb_text_align_left et_pb_bg_layout_light\"\u003e\n\u003cdiv class=\"et_pb_text_inner\"\u003e\n\u003cp\u003eOur Koso 4V Head Kit is the ideal engine part to complete the Koso Honda Grom® Big Bore kit. Because of its unique 4 valve design, the air flow and performance are increased. This new designed head is the perfect addition for those who desire more power and torque. The 4 Valve Head Kit features a forged piston, stainless steel 24 mm intake valves and 20 mm exhaust valves.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOnly fits Koso 170cc big bore kit\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"et_pb_module et_pb_text et_pb_text_4  et_pb_text_align_left et_pb_bg_layout_light\"\u003e\n\u003cdiv class=\"et_pb_text_inner\"\u003e\n\u003ch2\u003eWARNING\u003c\/h2\u003e\n\u003cp\u003eTHIS IS AN AFTERMARKET PART BUILT FOR RACING PURPOSES ONLY. KOSO IS NOT RESPONSIBLE FOR ANY DAMAGES CAUSED TO THE PARTS, VEHICLE, OR TO YOURSELF AND OTHERS.  ENGINE PARTS ARE NOT UNDER WARRANTY NOR IS COLLATERAL DAMAGE OR COST OF LABOR, IN CASES OF MALFUNCTION.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"et_pb_module et_pb_text et_pb_text_5  et_pb_text_align_left et_pb_bg_layout_light\"\u003e\n\u003cdiv class=\"et_pb_text_inner\"\u003e\n\u003ch2\u003e\n\u003ci aria-hidden=\"true\" class=\"fas fa-square-full fa-fw\"\u003e\u003c\/i\u003e\u003cspan\u003e \u003c\/span\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder height:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e64.2 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGasket thickness:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUpper: 0.25 mm | Bottom: 0.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePiston compression\u003c\/strong\u003e: height: 19.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e169.21cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSquish:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder head titration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e13.4 cc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression ratio:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e12.3 : 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve \/ Tappet clearance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIN: 0.10 mm EX: 0.17 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamshaft: Torque:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1.71 Hp: 26.26\u003cspan\u003e \u003c\/span\u003e\u003cem\u003e*measured without air filter \u0026amp; no noise reduction plug\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e**Requires the use of Iradium spark plug:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eNGK‑ER9EHIX (part\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/sylvainaube.org\/dev\/koso\/product\/ngk-spark-plug\/\"\u003eNGK-ER9EH\u003c\/a\u003e) or Denso # IY27, IY29 or IY31\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFits for Honda Grom\u003cspan class=\"s1\"\u003e®\u003c\/span\u003e \u0026amp; Honda\u003cspan class=\"Apple-converted-space\"\u003e \u003c\/span\u003eMonkey\u003cspan class=\"s1\"\u003e® up to 2021\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Koso North America","offers":[{"title":"Default Title","offer_id":40554955571246,"sku":"MC623000","price":1182.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0251\/9659\/3198\/files\/koso-north-america-4v-head-kit-honda-gromdriven-powersports-incmc623000-229979.jpg?v=1719587089","url":"https:\/\/www.drivenpowersports.ca\/fr\/products\/koso-north-america-4-valve-cylinder-head-kit-grom-monkey-13-20","provider":"Driven Powersports Inc.","version":"1.0","type":"link"}