Displacement: 187cc Bore Diameter: 67mm Compression ratio: 11.7: 1 Included Camshaft: 20 / 25D Intake Valve Diameter: 23mm x 2 Exhaust Valve Diameter: 19.5mm x 2
*About YX/GPX engine installation It can be used with other Kawasaki head type engines of the same series such as 1P60-FMJ, 1P60-5FMJ, ZS1P50YMJ, etc. However, there are various derivatives of these engines, so please check the specifications of the engine in question before purchasing.At SP Takegawa, only 1P60-FMJ, 1P60-5FMJ, and ZS1P50YMJ are confirmed to be installed.For other engines, please do it at your own risk.SP Takegawa is unable to answer any questions regarding specifications or details other than those related to the YX/GPX engine. *Depending on the lot, the product may be delivered with the old price and label with the old JAN code before the price change.
Superhead 4V+R head kit, cylinder kit and camshafts are included. The 4-valve design with 2 intake valves and 2 exhaust valves increases the valve curtain area and improves intake and exhaust efficiency. The original cylinder head shape was designed to balance the appropriate valve pinching angle, combustion chamber shape, and port shape for the 4-valve configuration, enabling high power output and sustained output characteristics in the high RPM range.The cylinder head is also equipped with aluminum roller rocker arms and auto decompression camshafts, which are well established in the Superhead+R series.
■Features of the valve The weight increased by the larger diameter valve is reduced by adopting a thinner valve stem shaft and waist processing.
■Valve Spring Unequal pitch (2-step pitch) is used to prevent surging at high RPM. Steel Valve Spring Retainer
■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.Four types of camshafts are available and can be replaced according to the application.The kit comes with recommended camshafts for each displacement.
■SCUT cylinder (patented structure) The displacement can be increased to 187cc without disassembling the crankcase and with the normal crankshaft.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.Maximizes the performance of Superhead 4V+R.The piston skirt is coated with molybdenum for better initial adhesion.
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.
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