*There may be changes in product specifications due to the manufacturer's reasons. *Depending on the lot, the product may be delivered with the old price and label with the old JAN code before the price change.
This is a kit part that uses the DOHC 4V+D cylinder head.
■Features of the DOHC 4V+D head There are two types of DOHC 4V heads, the standard camshaft type and the auto-decompression camshaft type. DOHC4V+D has auto decompression camshaft. Improved intake and exhaust efficiency The four-valve design with two intake valves and two exhaust valves increases the valve curtain area and improves the intake and exhaust efficiency. Improved combustion efficiency By placing the spark plug in the center, the combustion efficiency has been improved corresponding to the high compression pressure. The spark plug is M8 spark plug. The combustion chamber is a compact pent roof type combustion chamber with the optimum valve pinching angle. In addition, the combustion chamber is fully machined in 3D to minimize the variation of the combustion chamber volume and to reduce the surface area. Valve Diameter Intake valve diameter 22mm x 2 / Exhaust valve diameter 19mm x 2 The intake port is polished: The intake port of the DOHC head has been polished to increase the power output in the high rpm range. The exhaust port is a straight port: The exhaust port is not in the stock position, but a straight type is adopted to improve exhaust efficiency. Left side cover made of machined aluminum is adopted (TAKEGAWA logo in the center)
■Hollow camshaft (auto decompression mechanism) The camshaft is supported by ball bearings at both ends to reduce frictional resistance in the camshaft journal. The camshaft drivetrain is a semi-gear train and the cam gears are adjustable.Valve timing can be changed. Optional camshafts are available in addition to the included camshafts, allowing you to change the camshafts to suit your application and enjoy the performance of your vehicle. Included Camshaft: D25 / 30D auto decompression mechanism It reduces the kick-start force and the load on the transmission when starting the engine, and allows smooth engine starting even with large displacement engines.
■Ceramic plated cylinder / piston 124cc is HA cylinder Bore diameter 54mm Adopts all-aluminum ceramic plated cylinder with excellent durability, airtightness and heat dissipation. The cylinder is equipped with a temperature sensor as standard. You can measure the cylinder temperature by purchasing SP Takegawa thermometer built-in meter or thermometer. For 124cc HA cylinder: M5 Temperature Sensor 124cc uses forged pistons
■Two-point support crankshaft Special bearing with larger inner diameter of journal bearing for long stroke crankshaft (54mm stroke) is adopted for high power engine. This allows the shaft diameter to be increased from 20mm to 22mm in the journal area where the stress of the crankshaft is concentrated In addition, the crankshaft has been given a special surface treatment to further increase durability. Stroke amount 54mm
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.
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