Displacement: 138cc Bore Diameter: 59mm Compression ratio: 13.0: 1 Included Camshaft: S-20D Intake Valve Diameter: 30mm Exhaust Valve Diameter: 24.5mm Valve Stem Shaft Diameter: 4.5mm for both IN and EX
*You will need to change the exhaust. *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 Bore Up Kit 138cc with MIKUNI VM26 carburetor kit and spark plugs. The standard cylinder head incorporates the technology and internal structure of the original super head to enable the largest OHC valves and the appropriate valve pinching angle, resulting in high output characteristics and stable output characteristics in the high rpm range.
■Features of the valve The weight of the larger diameter valve is reduced by the use of a narrower valve stem shaft and waist processing to reduce weight loss. Valve Spring Double spring with inner spring and outer spring (unequal pitch) Steel Valve Spring Retainer
■Adopted roller rocker arm This product is forged aluminum rocker arms with integrated roller bearings.Compared to the conventional slipper type rocker arm, the slipper part is a roller bearing to reduce friction loss and smoothly follow the cam profile from low speed to high speed rotation.The weight increase due to the use of roller bearings has been overcome by making the rocker arm body of forged aluminum.
■Hollow camshaft with oil jet (auto decompression) An oil line is installed in the center of the camshaft to guide the oil to the cam sprocket.This increases the durability and lubrication of the cam chain.In addition, an oil jet passage is installed in the camshaft cam surface, and oil is sprayed from the cam surface to the rocker arm to effectively cool and lubricate.The camshaft journals are supported by ball bearings on both ends to reduce frictional resistance to the camshaft during starting and at low speeds.
■Auto decompression function The engine can be started with a light kick force even for vehicles with large displacement engines.There are 4 types of camshafts with different cam profiles, which can be replaced according to the application.
■Cylinder The cylinder is made of ceramic plated cylinder which has excellent airtightness, durability and heat radiation.SP Takegawa's big bore cylinder can be equipped with a stick temperature sensor, so you can measure the cylinder temperature by purchasing a thermometer separately.
■Piston The combustion chamber shape and compression ratio are balanced to achieve high combustion efficiency and low weight piston shape.It maximizes the performance of Superhead+R.The piston skirt is coated with molybdenum for better initial adhesion.
About the Combo Kit Super Head + R Bore Up Kit 138cc with MIKUNI VM26 carburetor kit and spark plugs. Included Camshaft: S-20D Throttle cable and air filter are included in the carburetor kit.
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.
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