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This is 310cc big bore kit for Yamaha BWS125, CYGNUS125, 5ML engines. Supplied with: 1.TTMRC four valves cylinder head EX28/IN30; 2.TTMRC ceramic l/c cylinder kit 76mm; 3.JISO forged crankshaft 10000 microns(+10mm); 4.JISO adjustable sprocket; 5.Aluminium spacer. For installation this kit you have to welding crankcase and move oil channel. Our shop can also provide such modified crankcase for you. For more information - contact us.