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Cylinder -BGM PRO 177/187 cc- Vespa PX125, PX150, Cosa125, Cosa150, GTR125, TS125, Sprint Veloce (VLB1T 0150001-), LML Star 125/150, Stella 125/150

€299.00 *

incl. VAT plus shipping costs

In stock: can be delivered or picked up in the store
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
P For this item you get fidelity point/s
The bgm PRO 177 cylinder kit comes with a ceramic plated alloy barrel with 63 mm bore. The piston...Continue reading


The bgm PRO 177 cylinder kit comes with a ceramic plated alloy barrel with 63 mm bore. The piston has two 1 mm rings and high content of silicium. There are four main transfer ports and two boostports. The cylinder kit is designed to give lots of torque from low down and a very broad power band. The port timings with a 57 mm crank are 118° transfer timing and 171° exhaust timing.

The kit is easy to fit and a Plug & Play solution that works out of the box. With a SI carb and the bgm Big Box Touring the power at the rear wheel is 15 hp and the torque 17 – 19 Nm. Higher power outputs are easy to obtain and 25 hp shouldn’t be a problem.

Low fuel consumption and high cruising range are further extras.

  • Ceramic plated alloy barrel
  • Bore 63 mm
  • Capacity 57 mm stroke 177 cc, 60 mm stroke 187 cc
  • Cast piston with high content of silicium and two 1 mm piston rings
  • Port timings 57 mm stroke: Transfers 118°, Exhaust 171°
  • Recommended squish clearance 0.8 – 1.2 mm
  • The transfer ports at the base are casted with a gate. This is matching the ports at the casings perfectly. The gate can easily be grinded away to use the complete cross section of the transfers.

The cylinder head is fully CNC machined from billet alloy with 4 mm recess. The recess is for centralizing and sealing. In the centre at the top of the head is a thread, if you want to use a temperature gauge.

UPSHOT: Perfect allround kit that is easy to fit and setup. Gives power and torque low down, broad power band, low fuel consumption and an unbeatable value for money!




Combustion chamber

Compression ratio

Compression ratio


18.38 cc

10.7 : 1

11.2 : 1


18.69 cc

10.5 : 1

11.0 : 1


19.01 cc

10.3 : 1

10.8 : 1


19.32 cc

10.2 : 1

10.7 : 1


19.63 cc

10.1 : 1

10.5 : 1

ONE TO WATCH: Can’t be used out of the box on engines with electric start or electric start flywheels. In this case the toothed ring on the flywheel has to been taken off. Or a flywheel without this has to be fitted (see related items).



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14 May 2019

Petite retouche necessaire entre Chemise et volant du demarreur.
Le reste est Parfait.

10 Jan 2018

👍Sehr passgenau. Alles Top

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