TOPPE KIT ROSA DUAL HEAD D47 MINA. LC

This version includes our new head (that can be disassembled) that ensures significantly lower operating temperatures in the cylinderpiston unit for improved reliability and performance.

In this new head, a larger portion of the combustion chamber comes into contact with the coolant to keep temperatures within an ideal range for enhanced engine efficiency.

The compression ratio has also been modified to accommodate the new temperature values.

Scope of delivery:

1 Cylinder Ø 47 mm in special “Minacrom” cast iron (with chrome additive)

1 Piston with high silicon content and SILVER insert

1 Chrome-plated piston ring in special cast iron S10

1 Piston gudgeon pin Ø 10 x3 8

1 mm Roller bearing for gudgeon pin Ø 10 x 14 x 12.5 mm

2Gudgeon pin circlips

1 Combustion chamber

1 Combustion chamber cover

8 Green Viton O-ring Ø 7.66 x 1.78

1 Green Viton O-ring Ø 51.50 x 1.78

1 Green Viton O-ring Ø 22.22 x 2.62

1 O-ring Ø 104.37 x 3.54

1 Reduction for temperature sensor

1 Cap M14 x 1.25

1 Aluminium gasket for cap M14 x 1.25

1 Cylinder base gasket, 0.4 mm thick, in aluminium

3 Metal clamps Ø 16 x 25

• Bore mm: 47
• Stroke mm: 39,2
• Displacement cm3: 68
• Squish mm: 0,9 ±0,1
• Timing diagram: exhaust: 199° transfer ports: 127°
• Compression ratio: geometric:14:1 actual: 7,3:1