Top Performances 183cc big bore tuning cylinder kit with 63mm bore for the YI3-OHC engine built from year 2009 and up Euro3 with fuel injection (not the carburettor type) suitable for Yamaha, Beta RR, Fantic engine 125cc 4T LC ie with 58.6mm stroke etc. Special here is that not only the cylinder with piston and small parts is supplied but that the matching ECU is included. Detailed assembly instructions are included. We recommend the large Naraku cylinder head with larger valves and the matching Top Performances crankshaft to supplement to get the maximum performance from this kit.

Bore: Ø63mm

Stroke: 58.6mm

Compression ratio: 11.5:1

Displacement: 182.67cc

Material: aluminium

The cylinder head is not included.

Piston pin: Ø14mm

Cooling: water cooled