Naraku 09311141 Cylinder-piston kitRef : NARK00084A / 09311141

Manufacturer reference: NK103.74 — NARAKU V.2 70 cm³ cylinder kit with cylinder head for Piaggio/Derbi D50B engines (Euro4 from 2018). Designed to replace the original cylinder while respecting the mounting points and factory look, this kit comes in an anthracite finish that is almost indistinguishable from the original.

• Compatibility: D50B Euro4 engines (from 2018).
• Contents: 70 cm³ cylinder + perfectly matched 70cc cylinder head.
• Performance: compression ratio designed for daily use — prioritises torque and acceleration over very high revs and noise.
• Installation & sensors: cylinder head thread compatible with temperature probes fitted since 2018 (Euro4 standard).
• Exhaust & carburation: suitable for original exhausts and sports models; if the original carburettor is retained, expect a jet approximately 7–10% richer (indicative value). Recommendation: 19 mm sports carburettor.

This kit is aimed at riders seeking a controlled increase in displacement for urban use, supermoto, light enduro, or sports/racing based on 50 cm³. Professional installation is recommended to adjust carburation and check clearances. Frequently compatible models: GILERA SMT 50 Drifting (2020), DERBI SENDA 50 SM X-Treme (2020), APRILIA SX 50 Factory (2020).