Bore Diameter: 58mm Stroke volume: 48.5mm Displacement: 130cc Compression ratio: 12.8: 1 Included Camshaft: SR-25 ■Port Diameter Intake: 29mm / Exhaust: D-type port ■Valve Diameter Intake: 28.5mm / Exhaust: 23.5mm ■Valve stem shaft: 4.5mm for both intake and exhaust ■Valve springs: Double spring with inner spring and outer spring ■Adopted roller rocker arm
*Boring of the crankcase is required when installing the 130cc kit. *The crankcase is machined by SP Takegawa.(Paid) *Depending on the lot, the product may be delivered with the old price and label with the old JAN code before the price change.
■Super head +R Inherited from the "Super Head (Stage 3) " which enables high output with large diameter valves and smooth intake and exhaust ports, the "Super Head (Stage 3) " is equipped with proven roller rocker arms and a new oil line structure for even higher output and durability. It is a high performance cylinder head. The roller rocker arm of SP Takegawa's Super Head +R for Monkey engine is adopted for the vertical engine to maximize the output performance of Super Head and to maintain the output at mid to high speed range and at high rpm range which is the feature of roller rocker arm. The roller rocker arm reduces the frictional resistance with the camshaft that occurs with the slipper type rocker arm (stock part type), and the roller bearing in the rocker arm follows the cam profile smoothly from low to high RPM. The rocker arm body is made of forged aluminum to overcome the weight increase by using roller bearings. Steel Valve Spring Retainer M8 spark plug adopted Since the wall pressure between the plug hole and the port is reduced due to the larger port diameter caused by the adoption of a large-diameter valve, an M8 spark plug is adopted to ensure sufficient wall pressure.This prevents the cylinder head from being damaged by thermal deformation, thus ensuring stable power output. Hollow camshaft with oil jet An oil line is installed in the center of the camshaft to guide the oil to the cam sprocket.As a result, oil is sprayed from the center of the cam sprocket by centrifugal force from the inside of the cam chain, increasing the durability and lubricating effect of the cam chain.In addition, an oil jet passage is provided on the camshaft cam surface, so that oil can be sprayed from the cam surface and cooling and lubrication can be performed effectively. The camshaft body is supported by ball bearings on both ends to reduce the frictional resistance that occurs in the oil journal (stock parts type). In addition, the weight of the camshaft body has been greatly reduced by the adoption of an oil passage. There are 3 types of camshafts with different profiles, SR-25 / SR-30 / SR-35, and they can be replaced according to the application. Camshaft holder with oil lines By installing a new oil line structure in the camshaft holder, the oil line is connected to the oil line in the cylinder head to enable detailed oil lubrication.In addition, a passage for directing oil to the hollow camshaft with oil jet is provided to support lubrication of the camshaft and cam chain. ■Cylinder / Piston Ceramic Mexi Linder This is an all-aluminum ceramic mesh cylinder with excellent durability, airtightness and heat dissipation.The surface area of the cylinder fins has been increased to further improve the heat dissipation. The cylinder is equipped with an oil outlet as standard.In addition, a stick temperature sensor can be installed to measure the temperature of the cylinder. Meter with stick temperature sensor Piston The piston skirt is coated with molybdenum for better initial adhesion. ■Long stroke crankshaft High performance crankshaft designed for optimum crankshaft weight balance against stroke volume.The crankshaft and bearings are manufactured to a high degree of precision to achieve low vibration and greatly enhance the motion performance of the crankshaft.Special surface treatment is applied to the shaft of the flywheel section to improve fatigue strength and galling resistance.
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.
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