Naraku 09311085 Cylinder-piston kitRef : NARK00139A / 09311085

Brand: NARAKU — Manufacturer Ref: NK600.75

4-valve cylinder head designed for 125 YI-3 engines, with a combustion chamber of 62 mm. This NARAKU part features a performance-oriented architecture: enlarged valve seats (intake 23 mm / exhaust 21 mm), reinforced valve springs, and optimised gas passage to improve intake and exhaust flow. Ideal for big bore setups or overbore cylinders.

• Combustion chamber: 62 mm
• Valves: intake 23 mm / exhaust 21 mm
• Cylinder compatibility: suitable for cylinders 62–64 mm (e.g. Naraku NK600.74, Polini 166.0101, Malossi M.3114852)
• Notes: supplied without rocker arm shafts. New models feature a lambda sensor port on the outlet (to be sealed on older models).
• Recalibration: the carburettor or injection must be reconfigured after installation (e.g. adjustment via ECU or mapping).

Suitable for Trail/Adventure, Enduro, Roadster, Urban, Sport/Racing, and Supermoto universes, this cylinder head is aimed at riders looking to optimise engine breathing during a big bore installation or preparation. Examples of compatible models: FANTIC XMF 125 Performance (2024), BETA RR 125 LC CBS Motard (2023), MH RANGER 125 LC (2018).