TOPPE KIT ROSA D.49.5 AM6 DUAL HEAD

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

Scope of delivery:

1 Cylinder Ø 49.5 mm in special “MINACROM” cast iron (with chrome additive)

1 Piston Ø 49.5 with high silicon content

1 Chrome-plated steel piston ring, 1 mm thick

1 Piston gudgeon pin Ø 12 x 42 mm

1 Roller bearing for gudgeon pin Ø 12 x 15 x 15 mm

2 Gudgeon 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 53.7 x 1.78

1 Green Viton O-ring Ø 22.22 x 2.62

1 Green Viton O-ring Ø 28.24 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, 0.5 mm thick

1 Reduction bush for muffl er connection (from Ø 28 to Ø 25 mm)

• Bore mm: 49,5
• Stroke mm: 39
• Displacement cm3: 75
• Squish mm: 0,9 ±0,1
• Timing diagram: exhaust: 195° transfer ports: 128°
• Compression ratio: geometric: 14,5:1 actual: 7,9:1