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[compression ratio] 115cc: 11.0 to 1 120cc: 11.4 to 1
[port diameter] Intake: 29mm Exhaust: D-type port
[valve diameter] Intake: 28.5mm Exhaust: 23.5mm
[valve stem shaft] Intake, exhaust: 4.5mm
[Material] Valve Spring Retainers: Steel Iron sleeve cylinder: made of aluminum Piston: Aluminum casting
Included Camshaft: SX-25
*Boring of the crankcase will be required. *Big fin cylinders cannot be installed on Ape50 / XR50 Motard. *The crankcase needs to be modified when the big fin cylinder is installed. *Depending on the lot, the product may be delivered with the old price and label with the old JAN code before the price change.
This kit part uses SP Takegawa's Super Head (Stage 3) cylinder head.
■Features of the Super Head (Stage 3) With the use of large diameter valves, the combustion chamber shape and port shape have been designed to achieve a good balance, resulting in high output characteristics.In addition, the large-diameter valve increases The weight of the valve stem shaft is reduced by the use of a narrow shaft and waist processing, which reduces the weight increase. Valve Springs: Double spring (unequal pitch) with inner spring and outer spring.
・M8 spark plug adopted The port diameter has been enlarged by adopting a large-diameter valve, and M8 spark plugs have been adopted between the plug hole and the port to ensure sufficient wall thickness.
・Camshaft 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). There are 3 types of camshafts with different profiles, SR-25 / SR-30 / SR-35, and they can be replaced according to the application. The camshaft included in the kit are the recommended camshafts by SP Takegawa.
・Camshaft holder with oil lines Oil line structure is adopted for the camshaft holder which holds both end bearings firmly. It is connected to the oil line in the cylinder head and enables lubrication of the oil in detail.
■Cylinder / Piston ・Big Fin Cylinders All aluminum ceramic plated cylinder with excellent durability, airtightness and heat dissipation is adopted. In addition, the cylinder sleeve is thicker and more durable to cope with the harsh environment of off-road driving and endurance racing. This cylinder is recommended for racing use.The kit is available in four versions: 115cc, 120cc, 124cc and 130cc.
The Big Fin cylinder is equipped with an oil outlet to the oil cooler and a SP Takegawa stick temperature sensor as standard. By installing SP Takegawa thermometer (with stick temperature sensor), it is possible to measure the cylinder temperature.
・Piston 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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