Cylinder Italkit 74cc Derbi Variant Start / Start 5 d.48mm c.40

Cylinder 74cc d.48mm stroke 40mm from manufacturer Italkit for Derbi Variant Start / Start 5.

This 74cc Italkit engine kit is the solution for those looking to give their Derbi Variant Start or Start 5 more power and make the engine rev out more without getting into machining work. By moving to a 48mm diameter, you increase displacement while keeping the original 40mm stroke crankshaft.

It is necessary to replace the original Cylinder when you notice that the bike has lost compression or if you are looking for extra power to move around more easily. This kit is made of aluminum with Nikasil coating, a material that dissipates heat better than iron and reduces friction, preventing seizures and ensuring that the engine works at a stable temperature even when pushed at high RPM.

The 6 transfer port design and the exhaust port with 2 venturis improve chamber filling, achieving more efficient combustion and a much fuller throttle response throughout the entire range. 

To get the best performance we recommend fitting a larger Carburettor, a reed valve box, and an exhaust.

Technical characteristics

• Displacement: 74cc
• Diameter: 48 millimeters
• Stroke: 40 millimeters (original)
• Material: Al-Si aluminum alloy with heat treatment
• Coating: Nickel-Silicon (Nikasil)
• Porting: 6 transfers and exhaust with 2 venturis
• Piston: 2 high-quality Piston rings
• Cylinder head: Not included, use the original

Compatible models

DERBI

• VARIANT START
• VARIANT START 5