The clutch cover is a part of transmission. The engine drives the crankshaft through the piston and converts the up-and-down movement of the piston into the rotational movement of the crankshaft. When power is transmitted to the clutch, centrifugal force is generated by the clutch rotation, which enables the clutch shoe to fling outward and attach to interior of clutch while driving the rotation of the outer clutch cover. Because the interior of clutch and transmission axis are fixed by groove connections, the outer cover and axis are driven simultaneously. Power is transferred to the wheel and axle from the gear set, enabling the motorcycle to move forward. This invention improve a part of the clutch cover. The clutch cover and function are improved by design. When the clutch cover rotate, it can make a effect of cooling. The wheel is driving when rub the interior of clutch with outer cover. wherefore, the components of transmission rise temperature because of the rub. That is way, the clutch shoe is worn easier. Therefore, the part of clutch cover which is designed can make a effect of cooling. That let the transmission system is not easy to rise the temperature. This invention improve the interior of clutch also. The interior of clutch processed some pattern which can rise the friction. That let clutch shoe is not easy to slip and enhance the transmission efficacy and boot speed