New cylinder with a bore increased to 63 mm with a displacement of 178cc and a completely revised internal fluid dynamics. The new transfer ports allow for a proper fit both with matched crankcases and completely original crankcases, and feature a special profiling designed to optimize flow and achieve significant performance increases, even without modifications.
Stroke: 57 mm
Transfer ports: 6
Long reach spark plug

Bore: 63 mm-Stroke: 60 mm-Long thread spark plug
A completely new thermal group is born, designed in every
part to achieve the maximum result in terms of performance and
durability. Every aspect of the system has been studied to maximize
mechanical resistance, fluid dynamics, and improve combustion: the
result is a top-of-the-range kit for construction quality and technological advancement.

7 transfers
Power range: 22>30 hp

Bore: 61 mm
Stroke: 57 mm
Transfers: 7
Long reach spark plug

PERFORMANCE EVERY DAY The BGM177 cylinder is
a very powerful, durable, and completely
everyday conversion cylinder. It covers a very wide range of applications. Simply
by swapping the cylinder, you can more than double the power of the standard
125cc engine and easily ride the wave of great torque.
Similarly, the exact same cylinder can turn the engine
into a beast with over 20 HP if it finds the right environment (carburetor,
exhaust, crankshaft). Thus, the cylinder offers beginners a
perfect base to be able to expand this, as needed,
more and more. The BGM PRO 177 replaces the original cylinder,
the conversion is simple and easy to reverse if necessary.
With its large displacement of 177cc, the BGM PRO 177 always offers
a safe and relaxed driving experience. The engine is as powerful as a
200cc machine, but with exactly the same reliability and durability.
It achieves this by operating in the same RPM range as a standard engine. The
low fuel consumption and the high range associated with it are

Bore: 63 mm-Stroke: 57 mm-Long reach spark plug
The thermal group is completely new and designed in every
part to achieve the best result in terms of performance and
durability. Every aspect of the system has been studied to maximize
mechanical resistance, fluid dynamics, and improve combustion: the
result is a top-of-the-range kit for construction quality and technological advancement.

Bore: 63 mm-Stroke: 57 mm-Long reach spark plug
A completely new thermal group is born, designed in every
part to achieve the maximum result in terms of performance and
durability. Every aspect of the system has been studied to maximize
mechanical resistance, fluid dynamics, and improve combustion: the
result is a top-of-the-line kit for construction quality and technological advancement.

7-port aluminum cylinder, barrel with nickel-silicon treatment.
Bore diameter 63mm/Stroke 57mm
Phases-->Main Transfers 114°   Exhaust 171°
New single-ring aluminum alloy Piston  
New model of Head in aluminum made from CNC machining, Viton O-ring
Squish 1mm ±0.1mm/Tightening nuts 11÷12 Nm/Tightening bolts 10÷11 Nm
RECOMMENDATIONS-->Spark plug NGK B9ES; BOSCH W3CC, Advance 19° before TDC
Main jet 125-130

7-port aluminum cylinder, barrel with nickel-silicon treatment.
Bore diameter 63mm/Stroke 57mm
Phases-->Main transfers 114°   Exhaust 171°
New Bifascia aluminum alloy piston
New model of CNC machined aluminum head, Viton O-ring
Squish 1mm ±0.1mm/Nut torque 11÷12 Nm/Bolt torque 10÷11 Nm
RECOMMENDATIONS-->Spark plug NGK B9ES; BOSCH W3CC, Advance 19° before TDC
Main jet 125-130

Meteor Piston

7-port aluminum cylinder with Nikasil-coated barrel and exhaust "Booster".
Bore diameter 63mm, stroke 57mm, displacement 177cc,
main transfer phases 117°, exhaust 177°. Meteor aluminum alloy two-ring piston

Die-cast aluminum head with 8 mounting points and recessed squish band
Steel rings. Steel pin. Steel clips.
Cylinder gaskets in paper/aluminum.
Zinc-plated steel exhaust manifold bolted with Viton O-ring gasket.

Cylinder 7 transfers in cast iron, spheroidal casting technology by gravity.

Bore diameter 63mm, stroke 57mm, displacement 177.59 cc,

main transfer phases 114°, exhaust 173°. Aluminum alloy dual-ring piston

CNC machined aluminum head with 8 fixing points and head/cylinder O-ring gasket in Viton

Steel rings. Steel pin. Steel locks.

Cylinder gaskets in paper/aluminum with a plug to close the hole on the original shroud.

Zinc-plated steel exhaust manifold screwed with Viton O-ring gasket.

7-port aluminum cylinder with Nikasil-coated bore and exhaust "Booster".
Bore diameter 63mm, stroke 57mm, displacement 177cc,
main transfer phases 117°, exhaust 177°. Meteor dual-ring aluminum alloy piston

Die-cast aluminum head with 8 fixing points with recessed squish band
Steel rings. Steel pin. Steel retainers.
Cylinder gaskets in paper/aluminum.
Zinc-plated steel exhaust manifold bolted with Viton O-ring gasket.

12-14-16-16-19
gear selector, shift rod, spacer set, selector lever, adjustment block

The BGM PRO 177cc is an improved and more powerful version of the proven BGM177 cylinder for Vespa PX125/150, now also compatible with models equipped with electric start.

Everyday Performance
The BGM177 cylinder is designed to offer high performance, durability, and reliability for daily use. By replacing the original cylinder, it is possible to double the power of the standard 125cc engine, with generous torque that allows for smooth riding. The cylinder can also be configured to reach over 20 HP, provided the right carburetor, exhaust, and crankshaft are paired with it. It is therefore an ideal solution for beginners who want to expand performance in the future.

With a displacement of 177cc, the BGM PRO 177 cylinder ensures a safe and relaxed riding experience, maintaining the same reliability and durability as a 200cc engine, operating within the same RPM range as a standard engine. It also offers low fuel consumption and good range. It is compatible with standard components, requiring only a small adjustment to the carburetor jet and spark plug.

Main Features
Material:

Sealing kit included with the BGM cylinder
This kit includes three base cylinder gaskets and one head gasket.

Gasket thicknesses:
Base gaskets: 0.2mm, 0.4mm, 0.6mm in aluminum
Head gasket: 0.5mm in copper
The variable thickness of the base gaskets allows for optimizing control angles according to specific needs or stroke. For fine adjustments, aluminum spacers for the head are also available.