S-Stage Bore Up Kit 138cc Without Camshaft XTZ125/YX125DX/YB125SP

Details:
・The S-Stage Big Bore Kit delivers powerful output characteristics by simply bolting it onto the stock cylinder head.
・When installed simultaneously with the sports camshaft, it maximizes the engine output of the S-Stage, achieving a torquey ride completely different from a stock engine.
・By using the stock cylinder head and installing the cylinder and piston, the displacement can be increased to 138cc.
・Bore diameter: 57mm Stroke: 54mm (stock)
・Cylinder: Features an aluminum cylinder with an iron sleeve.
・The piston skirt is coated with molybdenum to ensure good initial break-in with the cylinder. Compression ratio 11.6:1 Recommended parts for simultaneous installation
・The following mufflers are for the XTZ125. They cannot be installed on the YX125DX or YB125SP. Also, the following mufflers for the XTZ125 are government-certified, but this applies to stock engines. If installed simultaneously with TAKEGAWA engine parts, they will not be certified. Please be aware.
・Improved muffler exhaust efficiency allows for increased output. It also has excellent compatibility with TAKEGAWA's S-Stage Big Bore Kit.
Cone Oval Muffler (Slip-on/Part No. 04-02-0241)
Power Silent Oval Muffler (Slip-on/Part No. 04-02-0242) Compatible Models/Compatible Frame Numbers: YAMAHA XTZ125/JYM125-9, YX125DX/JYM125-3G, YB125SP/JYM125-3F
*Images are for illustration purposes only, and the design and specifications of the products shown are subject to change without notice. Please understand.