Ø39.88 mm cast iron piston cylinder Derbi Euro 3, Euro 4 Top Performances

Upper engine Top Performances Derbi Euro 3 and Euro 4

Piston kit new complete adaptable for motorcycle 50cc Derbi, Gilera, Aprilia, Speedcool and other motorbikes Derbi Euro 3 egg Euro 4 from 2006.
We encountered assembly problems on the motors Derbi Euro 4. In fact, on certain crankcases you have to file the right crankcase so that the cylinder does not hit against it (see last photo). Also consider replacing the piston pin needle cage of dimension 12x15x15 mm which is not supplied in the high engine kits (this bearing is sold separately).

This piston cylinder block kit includes

• 1 x cylinder block
• 1 x cylinder head
• 1 x cylinder block
• 1 x piston
• 2 x piston rings
• 2 x circlips
• 1 x gudgeon pin
• 1 x upper coolant connection
• 1 x probe adapter for Derbi Euro 4
• 4 x studs
• 1 x cylinder cap right side
• 1 x set of seals

Technical characteristics and dimensions of the cylinder block kit

• Mark: Top Performances
• Cylinder color: gray
• Cylinder block material: cast iron
• Piston diameter: 39.885 mm
• Piston pin diameter: 12 mm
• Cylinder fixing center distance: 52 mm
• Temperature probe thread diameter: 14 mm (Euro 3)
• No threading of the probe: 1.50
• Temperature probe thread diameter: 12 mm (Euro 4)
• No threading of the probe: 1.50