[roller rocker arm] ・Valve Diameter: IN 25mm x 2 / EX 21.5mm x 2 ・Valve stem shaft diameter: 4. 5mm for both IN and EX ・Aluminum forging
*This product is a cylinder head kit for those who have already installed SP Takegawa's Super Head 4V+R Big Bore Kit 181cc and want to change the specification of the cylinder head only. *In order to use this product, you need to install SP Takegawa Super Head 4V+R Big Bore Kit 181cc (01-04-0130), COM TYPE-X, Large Capacity Injector (G-2) and Big Throttle Body Kit at the same time. *Please check before assembling the SP Takegawa parts to be reused. *If any damage is found, you will need to replace it with a new one. *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.
Based on the "Super Head 4V+R" which achieves the highest class of OHC output characteristics, the "Super Head 4V+R (5-axis port machining) " is a high-precision machining of the intake port by 5-axis machining center for further improvement of the output performance)"
■Super head 4V+R head (combustion chamber shape) Super Head 4V+R (5 Axis Port Machining) Cylinder Head Details Two intake / exhaust valves are used each to increase the valve curtain area and achieve high intake / exhaust efficiency. The original head shape was designed to balance the center plug, valve pinching angle, combustion chamber shape, and port shape to achieve a higher output than the stock head. The combustion chamber is finished with high accuracy by NC machining.
■5 Axis Port Machining (Intake Port) Intake port machined by 5-axis machining center. In order to improve the power output at higher rpm, the optimum intake port shape was designed and the port was machined by 5-axis machining center. The intake ports are precisely machined by 3D programming, and are beautifully smoothed to achieve high intake efficiency.
■Roller rocker arm Valve Diameter: IN: 25mm x 2 / EX: 21.5mm x 2 Valve Stem Shaft Diameter: 4. 5mm for both IN and EX Unequal pitch valve springs: It prevents surging at high RPM. Adopted forged aluminum roller rocker arms The frictional resistance with the camshaft is reduced, and smooth operation is realized.
■5-axis port machining (manifold) Special manifold machined by 5-axis machining center is adopted The manifold has also been 5-axis machined to allow smooth intake to the 5-axis machined intake port. The 3D programmed manifold is beautifully smoothed to enhance the intake effect.
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.
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