*SP Takegawa carburetor kit and exhaust are required to get the best performance from the 17R Stage+D. *Depending on the lot, the product may be delivered with the old price and label with the old JAN code before the price change.
■17R Stage +D Cylinder Head Based on the stock head shape, large diameter valve intake: 26mm / exhaust: Adopt 22.5mm. (12V Monkey stock valve diameter is intake: 19mm / exhaust: 16mm) This is SP Takegawa's original cylinder head which adopts the most suitable valve pinching angle, combustion chamber shape and port shape for large diameter valves. The port diameter of the stock head is 14mm for both intake and exhaust, while the port diameter of the 17R stage is 14mm for intake and exhaust: 24.5mm / exhaust: Larger diameter of 19mm.In addition, the adoption of a 3-dimensional port shape, combined with the larger diameter of the valve and port, makes it possible for more intake and exhaust gases to flow smoothly. Valve: (Intake 26mm / Exhaust 22.5mm Valve stem shaft diameter 4.5mm) The weight increase due to the larger diameter of the valve is kept to a minimum by the narrower stem shaft and waist machining. Valve Springs: The single valve spring with unequal pitch (2-stage pitch) is adopted for optimum spring rate and suppresses surging at high rpm.
■Auto decompression camshaft Auto decompression function: The engine can be started with a light kick force even on high compression and high displacement engines. There are 3 types of camshafts, R-10E / R-15E / R-20E, and you can change the camshafts according to your application and enjoy the riding performance. 88cc / Scat 106cc / 106cc Kit Included Camshaft: R-10E
Φ52V cylinder (aluminum sleeve cylinder), piston The V-cylinder is a cylinder with vertical and horizontal fins to improve the cooling effect at low speeds. The longitudinal fins have the effect of cooling the heat rising from the bottom of the cylinder when the vehicle is stopped or at low speed. It changes the appearance from the stock cylinder and enhances the custom image. A stick temperature sensor can be connected to the side of the cylinder, and the cylinder temperature can be measured by using SP Takegawa's compact LCD thermometer (with stick temperature sensor) or various meters with thermometers separately.
The piston has a molybdenum coating on the skirt for better initial adhesion.
■Stroke-up crankshaft (2-point crankshaft) 2B crankshaft = 2-point crankshaft (106cc: 50mm stroke) The 2B crankshaft is supported by two bearing journals in the crankcase as stock. Special bearings with a larger inner diameter crankshaft journal bearing are used to accommodate high power engines. As a result, the shaft diameter of the journal section, where the stress of the crankshaft is concentrated, can be increased from 20mm to 22mm, thus improving strength. In addition, the balance cut processing is done for the low vibration measure, and it is manufactured lightly.
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.
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