{"product_id":"tk-01-06-0036","title":"Superhead 4V+R Bore \u0026 Stroke Up Kit 106cc Monkey Gorilla","description":"\u003cp\u003e【SP武川 01-06-0036 Superhead 4V+R Bore \u0026 Stroke Up Kit 106cc Monkey Gorilla Bore Up Engine Parts Takegawa】\n\u003cbr\u003e■Product Description\n\u003cbr\u003eThis set includes the Superhead 4V+R head kit, cylinder kit, camshaft, and crankshaft kit (with Dyhard α cam chain).\n\u003cbr\u003e2-point support crankshaft with X-section connecting rod.\n\u003cbr\u003eBore diameter 52mm. Stroke volume 50mm. Compression ratio 12.5:1.\n\u003cbr\u003eIncluded camshaft: 10\/15D\u003c\/p\u003e\n\n\u003cp\u003e■Detailed Description\n\u003cbr\u003e●Features of Superhead 4V+R (1 Cam 4 Valves)\n\u003cbr\u003eCompared to the large-diameter 2-valve Superhead +R manufactured by SP Takegawa, by having two intake valves and two exhaust valves, the valve curtain area can be further expanded, enabling higher intake and exhaust efficiency than large-diameter 2-valve systems.\n\u003cbr\u003eFurthermore, with the adoption of 4 valves, the head is designed to balance the center plug, valve挟み角 (valve included angle), combustion chamber shape, and port shape, allowing for higher output and achieving the sustained high-rpm output characteristics that are a major feature of the Superhead.\n\u003cbr\u003eBy adopting a 1-cam 4-valve system, it has been possible to achieve as much lightness and compactness as possible, and at the same time, condense the performance as the strongest SOHC head.\n\u003cbr\u003e●New Shape Superhead 4 Valve +R Body\n\u003cbr\u003eThe rounded cylinder head shape matches the Monkey style well, enhancing the custom image of the vehicle.\n\u003cbr\u003eAdditionally, the barrel-polished die-cast head covers beautifully enhance the cylinder head.\n\u003cbr\u003e●Valve Features\n\u003cbr\u003eValve diameter: Intake: 21.5mm x 2 \/ Exhaust: 18.5mm x 2\n\u003cbr\u003eValve stem shaft diameter: 4.0mm for both intake and exhaust\n\u003cbr\u003e●Valve Spring\n\u003cbr\u003eAdopts unequal pitch to prevent surging at high revolutions.\n\u003cbr\u003e●IN\/EX Port Features\n\u003cbr\u003eThe port diameter adopts the optimal port diameter to match SP Takegawa's 3D-shaped manifold.\n\u003cbr\u003eFurthermore, by installing it simultaneously with the 3D-shaped manifold, a smooth, unobstructed intake effect from the carburetor to the combustion chamber is possible, maximizing the performance of the cylinder head.\n\u003cbr\u003e●Adoption of Roller Rocker Arm\n\u003cbr\u003eBy adopting a roller rocker arm, the output performance of the Superhead +R is maximized, enabling increased output in the mid-to-high speed range and maintaining output at high RPMs, which is a feature of roller rocker arms.\n\u003cbr\u003eRoller rocker arms reduce the friction resistance with the camshaft that occurs with slipper-type rocker arms (OEM type parts), and the roller bearings built into the rocker arm smoothly follow the cam profile from low to high revolutions.\n\u003cbr\u003e●M8 Spark Plug\n\u003cbr\u003eAn M8 spark plug is adopted due to the optimal valve included angle from the 4-valve system and the compact head.\n\u003cbr\u003e●Hollow Camshaft with Oil Jet (Auto Decompression)\n\u003cbr\u003eThe camshaft employs ball bearing support at both ends, reducing friction resistance in the camshaft journal part.\n\u003cbr\u003eIn addition to the included camshaft, optional camshafts are available, so you can replace them according to your intended use and enjoy the driving performance.\n\u003cbr\u003eIncluded camshaft: 10\/15D\n\u003cbr\u003e●Auto Decompression Mechanism\n\u003cbr\u003eReduces the force of the kick start and the load on the transmission when starting the engine, allowing for smooth engine starts even with large displacements.\n\u003cbr\u003e●H Cylinder Bore Diameter 52mm\n\u003cbr\u003eAdopts an aluminum steel sleeve cylinder.\n\u003cbr\u003eThe cylinder is equipped with a temperature sensor mounting part as standard.\n\u003cbr\u003eYou can measure the cylinder temperature by purchasing an SP Takegawa thermometer-integrated meter or thermometer.\n\u003cbr\u003eFor 106cc H cylinder: M5 temperature sensor\n\u003cbr\u003e●Piston\n\u003cbr\u003eAdopts a cast piston.\n\u003cbr\u003e●Adoption of X-section Connecting Rod\n\u003cbr\u003eMachined from forged material, adopts an X-section shape.\n\u003cbr\u003eEnsures sufficient strength while reducing weight, and significantly improves diffusion of buckling stress and torsional rigidity.\n\u003cbr\u003eSurface is shot-finished.\n\u003cbr\u003e●Strengthening of Journal Section\n\u003cbr\u003eAdopts special bearings with an enlarged inner diameter of the crankshaft journal bearings.\n\u003cbr\u003eThis makes it possible to increase the shaft diameter from 20mm to 22mm in the journal section, where stress concentrates on the crankshaft, thereby strengthening the shaft.\u003c\/p\u003e\n\n\u003cp\u003e■Compatible Models\n\u003cbr\u003eHONDA\n\u003cbr\u003e12V Monkey Gorilla (Z50J-2000001～)(AB27-1000001～1899999)\u003c\/p\u003e\n\n\u003cp\u003e■Notes\n\u003cbr\u003e※The image is for illustration purposes only. Includes products with different sizes and colors.\n\u003cbr\u003e※Product design and specifications are subject to change without notice. Please understand.\n\u003cbr\u003e※This product is made-to-order, so cancellations after ordering are not possible.\n\u003cbr\u003e※This product is made-to-order, so delivery may take some time. Also, please note that the manufacturer may discontinue the product or change specifications without prior notice. Thank you for your understanding.\u003c\/p\u003e","brand":"スペシャルパーツ武川(SPECIAL PARTS TAKEGAWA)","offers":[{"title":"Default Title","offer_id":47208274657515,"sku":"tk-01-06-0036","price":200912.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1021\/9499\/files\/tk-01-06-0036.jpg?v=1766738551","url":"https:\/\/bikeman.jp\/en\/products\/tk-01-06-0036","provider":"バイクマン","version":"1.0","type":"link"}