Super Head 4-Valve+R Bore Stroke Up Kit 106cc

■Features of Super Head 4V +R (1 Cam 4 Valve)
Compared to the SP Takegawa Super Head +R's large diameter 2 valves, the SP Takegawa Super Head +R has 2 intake valves and 2 exhaust valves, which increases the valve curtain area and improves the intake and exhaust efficiency more than the large diameter 2 valves.
In addition, the head shape was designed to balance the center plug, valve pinching angle, combustion chamber shape, and port shape in order to achieve high power output and sustained output characteristics in the high RPM range, which is the biggest feature of the Super Head.
By adopting 1 cam and 4 valves, it was possible to make it as light and compact as possible, and at the same time, it condensed the performance as the strongest SOHC head.

New shape super head 4 valve + R body
The round shape of the cylinder head suits the Monkey style and enhances the custom image of the vehicle.
Each head cover is made of die-cast and barrel polished to give a beautiful appearance to the cylinder head.

Valve Features
Valve Spring
The use of unequal pitch prevents surging at high RPM.

IN / EX Port Features
The port diameter is optimized for SP Takegawa's 3-dimensionally shaped manifold.
In addition, by installing it together with the 3-dimensionally shaped manifold, it enables a smooth intake effect from the carburetor to the combustion chamber without resistance, and the performance of the cylinder head can be maximized.

Adoption of roller rocker arm
By adopting the roller rocker arm, the output performance of the Super Head +R is maximized and the output in the mid to high speed range is increased and the output in the high rpm range is maintained, which is the characteristic of the roller rocker arm.
The roller rocker arms reduce the frictional resistance to the camshaft that occurs with slipper type rocker arms (stock part type)
The roller bearings in the rocker arm allow the cam to follow the cam profile smoothly from low to high rpm.

M8 Spark Plug
The M8 spark plug was adopted in conjunction with the optimum valve pinching angle and the compactness of the head due to the 4-valve system.

■Hollow camshaft (auto decompression mechanism)
The camshaft is supported by ball bearings at both ends to reduce frictional resistance in the camshaft journal.
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.

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.

■Cylinder / Piston
H Cylinder
Aluminum steel sleeve cylinder is adopted.
The cylinder is equipped with a temperature sensor as standard.
You can measure the cylinder temperature by purchasing SP Takegawa's built-in thermometer or thermometer.
For 106cc H Cylinder: M5 Temperature Sensor

Piston
The piston skirt is coated with molybdenum for better initial adhesion.

■Reinforced crankshaft (2-point crankshaft)
X-shaped connecting rods
Forging material is machined, and an X-shaped cross section is adopted.
It is lightweight and strong enough, and its buckling stress diffusion and torsional rigidity are greatly improved.
Surface shot finish.

Strengthening the Journal Department
A special bearing with a larger inner diameter is used for the crankshaft journal bearing.
As a result, the shaft diameter of the journal section, where the stress on the crankshaft is concentrated, can be increased from 20mm to 22mm to increase the strength of the shaft.