Malossi 47mm Cylinder Kit for Vespa 50

Cylinder

  • Material: special self-lubricating, wear-resistant, highly refined cast iron alloys, obtained by Shell Moulding gravity die-casting.
  • Machining: on numerically controlled high precision machine tools.
  • Recalculated and increased heat exchange surfaces.
  • Exhaust and transfer ports designed and tuned for maximum thermodynamic performance.
  • Dimensional and surface finish quality control performed according to Malossi's internal specifications.
  • Cylinder and piston selected for a 100% fit of 0.010-0.005 mm.
  • Checking of all the seals carried out.

Piston

  • Material: special aluminium alloy with high silicon content and low thermal expansion.
  • Machining: on numerically controlled machine tools.
  • Lightened and strengthened.
  • Heat exchange surfaces increased.

Piston rings

  • Piston rings in very strong modular cast iron with ground, wear-resistant.

Head

  • Material: special die-cast aluminium alloy.
  • Geometry of heat exchange surfaces recalculated and increased.
  • Machining: numerically controlled high precision machines with diamond tools.
  • Surface rust prevention treatment.
  • Viton Head Gasket.
  • Hemispheric combustion chamber with centred squish and spark plug.

 

Article

31 7903

Ø 47 mm

31 8691

Ø 55 mm

Stroke

43 mm

43 mm

Capacity 74.60 102.16

Compression ratio

12,5:1

12,5:1

Piston rings

No. 2 rectangular section 1.5 mm

No. 2 rectangular section 1.5 mm

No. of transferts

6

6

Head

hemispherical

hemispherical

Spark plug

central

central

Piston

alluminium alloy 21%

alluminium alloy 21%

PIAGGIO PIAGGIO APE 50 2T <-1989

PIAGGIO PIAGGIO APE FL 50 2T 1989->1990
PIAGGIO PIAGGIO APE FL2 50 2T 1990->1995
PIAGGIO PIAGGIO APE FL3 50 2T 1996->1999
VESPA VESPA PK 50
VESPA VESPA PK FL 50
VESPA VESPA PK HP FL 50
VESPA VESPA PK XL 50
VESPA VESPA SPECIAL 50
  • Model: M317903

$159.97