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BGM Tuning

BGM PRO Vespa 177/187 Cylinder Kit PX COSA Sprint LML (Non Electric Start)

BGM PRO Vespa 177/187 Cylinder Kit PX COSA Sprint LML (Non Electric Start)

Regular price £275.00 GBP
Regular price Sale price £275.00 GBP
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The bgm PRO 177 cylinder is a hard ceramic coated aluminum cylinder with 63mm bore. The coating (nickel silicon carbide) provides an extremely hard and durable raceway.
The piston has a high silicon content. As a result, it has lower thermal expansion, is more wear resistant and thermally very stable.
Two 1mm thick piston rings minimize friction, increasing performance and speed stability.


Will fit:


LML 125 (2 stroke)
LML 125 Deluxe (2 stroke)
LML 125 DLX (2 stroke)
LML 125 Stella (2 stroke)
LML 150 Belladonna (2 stroke)
LML 150 Belladonna RV (2 stroke)
LML 150 DLX (2 stroke)
LML 150 Star (2 stroke)
LML 150 Via Toscana (2 stroke)
Vespa (Motovespa) Vespa 125 CL (engine 9CL)
Vespa (Motovespa) Vespa 150 CL (engine 9NC)
Vespa (Motovespa) PX 125 Iris (engine 99M)
Vespa (Motovespa) PX 150 Iris (engine 75M)
Vespa (Piaggio) Vespa 150 Sprint Veloce (VLB1T)
Vespa (Piaggio) Cosa 150 CL (VLR1T)
Vespa (Piaggio) Cosa 150 CLX (VLR1T300)
Vespa (Piaggio) Cosa 150 FL (VLR2T)
Vespa (Piaggio) P 150 X (VLX1T, -1980)
Vespa (Piaggio) PX 150 E FL (VLX1T, 1984-1997)
Vespa (Piaggio) PX 150 E (VLX1T, 1981-1983)
Vespa (Piaggio) Vespa 125 TS (VNL3T)
Vespa (Piaggio) Cosa 125 CL (VNR1T)
Vespa (Piaggio) Cosa 125 CLX (VNR1T300)
Vespa (Piaggio) Cosa 125 CLX (VNR1T301)
Vespa (Piaggio) P 125 X (VNX1T, -1983)
Vespa (Piaggio) PX 125 E FL (ZAPM09300, 1998-2000)
Vespa (Piaggio) PX 125 E FL (ZAPM09302, 2001-)
Vespa (Piaggio) PX 150 E FL (ZAPM09400, 1998-2000)
Vespa (Piaggio) PX 150 E FL (ZAPM09401, 2001-)

The cylinder's port layout, with four main spill ports and two boost ports, is designed for plenty of low-end pressure.
Timing is 57mm stroke with 118° overflow to 171° exhaust angle.

The cylinder kit is designed as a plug 'n play solution, simply plugged in with SI carburetor and bgm big box touring the power is around 15hp and torque is 17 - 19Nm at the rear wheel.
With further expansion stages, 25 hp and more are no problem.

Low consumption values and the associated high range are another bonus

  • Cylinder material: aluminum
  • Raceway: coated with nickel-silicon-carbide
  • Bore: Ø 63mm
  • Displacement 57/60mm Stroke: 177/187 cc
  • Piston: cast piston with high silicon content and two 1mm steel piston rings
  • Recommended pinch point: 0,8- 1,2mm
performance class: sport
Gudgeon pins
diameter: 15 mm
Spark plugs
thread type: M14x1,25
thread spark plug: long
heat rating NGK: B9ES
displacement: 177 cm³
bore: 63 mm
engine type: 2-stroke
type of cooling: air cooled
material: aluminium
material piston cylinder surface: Ceramic
cylinder head inclusive:
cylinder gasket set inclusive:
number of transfers (incl.boost ports): 6
number of boost ports: 2
shape exhaust port: single port (oval)
exhaust mounting: stub
diameter exhaust stub: 37 mm
number of piston rings: 2
production method piston: cast
Piston rings
piston ring type: common ring
circlip type: C-type
wire size of circlip: 1,0mm
Cylinder heads
cylinder head type: one piece
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