{"product_id":"sp-takegawa-super-head-4vr-181cc-big-bore-kit-honda-grom-monkey-125","title":"SP Takegawa Super Head 4V+R 181cc Big Bore Kit – 5-Axis Ported | Honda Grom \u0026 Monkey 125","description":"\u003cdiv style=\"background:#f8d7da;border-left:4px solid #dc3545;padding:12px 16px;margin:0 0 16px 0;\"\u003e\n\u003cstrong\u003e⚠️ For Competition Use Only.\u003c\/strong\u003e Not intended for street use. Installation requires SP Takegawa FI Controller TYPE-X, Big Throttle Body Kit, and Large Capacity Injector (G-2) — none of which are included.\n\u003c\/div\u003e\n\n\u003ch2\u003eSP Takegawa Super Head 4V+R 181cc Big Bore Kit – The Pinnacle of Grom \u0026amp; Monkey 125 Performance\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSP Takegawa Super Head 4V+R 181cc Big Bore Kit\u003c\/strong\u003e represents the highest level of engineered performance available for the Honda Grom and Monkey 125. Featuring a \u003cstrong\u003e5-axis CNC-ported cylinder head\u003c\/strong\u003e, four-valve combustion chamber, forged roller rocker arms, and an all-aluminum ceramic cylinder, this kit is built for riders who demand maximum output and precision engineering in every component.\u003c\/p\u003e\n\n\u003ch3\u003eSuper Head 4V+R – Key Engineering Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-valve combustion chamber (2 IN \/ 2 EX)\u003c\/strong\u003e — increases valve curtain area for superior intake and exhaust efficiency vs. 2-valve heads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-axis CNC-ported intake ports\u003c\/strong\u003e — 3D-programmed for optimum flow at high RPM; beautifully smoothed for maximum intake efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-axis CNC-machined intake manifold\u003c\/strong\u003e — matched to the ported head for seamless airflow transition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNC-machined combustion chamber\u003c\/strong\u003e — high-precision finish balancing plug placement, valve pinch angle, and chamber shape for peak output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnequal-pitch valve springs\u003c\/strong\u003e — prevents valve float and surging at high RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForged aluminum roller rocker arms\u003c\/strong\u003e — reduces friction against camshafts for smooth, efficient valve actuation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto-decompression camshafts (10\/10D, standard)\u003c\/strong\u003e — enables smooth, starter-friendly engine starts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional 15\/15D camshafts available\u003c\/strong\u003e — for improved mid-to-high RPM output (sold separately)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCylinder \u0026amp; Piston\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-aluminum ceramic cylinder\u003c\/strong\u003e — black painted finish; excellent durability, airtightness, and heat dissipation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil cooler outlet port\u003c\/strong\u003e — compatible with SP Takegawa Oil Cooler Kit (recommended for sustained high-performance use)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM5 sensor mount on oil plug bolt\u003c\/strong\u003e — compatible with SP Takegawa compact LED thermometer set for cylinder temp monitoring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-compression forged piston (12.5:1)\u003c\/strong\u003e — NC-machined piston top for precision fit and high-performance durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eValve Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake valve diameter:\u003c\/strong\u003e 25mm x 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust valve diameter:\u003c\/strong\u003e 21.5mm x 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve stem diameter:\u003c\/strong\u003e 4.5mm (IN \u0026amp; EX)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression ratio:\u003c\/strong\u003e 12.5:1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 181cc\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHonda Grom (MSX125) — OG \/ SF generation (4-speed)\u003c\/li\u003e\n\u003cli\u003eHonda Monkey 125 — 1st Gen (4-speed)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRequired Additional Parts (Not Included)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSP Takegawa FI Controller TYPE-X\u003c\/li\u003e\n\u003cli\u003eSP Takegawa Big Throttle Body Kit\u003c\/li\u003e\n\u003cli\u003eSP Takegawa Large Capacity Injector (G-2)\u003c\/li\u003e\n\u003cli\u003eSP Takegawa Special Clutch Kit \u003cem\u003e(strongly recommended to prevent clutch slip)\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 01-05-0130\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eProfessional installation strongly recommended. Instruction manual, if included, will be in Japanese.\u003c\/em\u003e\u003c\/p\u003e","brand":"SP Takegawa","offers":[{"title":"Default Title","offer_id":48239482011889,"sku":"01-05-0130","price":2054.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0626\/1348\/7857\/files\/12211722_5fe05b41df91a.jpg?v=1780351076","url":"https:\/\/howlingmoto.com\/products\/sp-takegawa-super-head-4vr-181cc-big-bore-kit-honda-grom-monkey-125","provider":"Howling Moto","version":"1.0","type":"link"}