BGM PRO 177CC CYLINDER FOR VESPA PX125/150 (ALSO WITH ELECTRIC STARTER)

New version of the proven BGM177 cylinder for Vespa PX125/150. Now also suitable for vehicles with electric starter.

Scope of delivery:

• Cylinder
• Piston
• Piston rings
• Piston pin
• Piston clips
• Gasket set

EVERYDAY PERFORMANCE BOOST
The BGM177 cylinder is a very powerful, durable and fully everyday compatible conversion cylinder. It covers a very wide range of applications. You can already more than double the performance of the 125cc standard engine by simply replacing the cylinder and wonderfully ride the large torque shaft. Exactly the same cylinder can transform the engine into a beast with over 20PS if it finds the right environment (carburetor, exhaust, crankshaft). This makes the cylinder a perfect basis for beginners to expand this, as needed.

The BGM PRO 177 replaces the original cylinder, the conversion is easily reversible if necessary. With its large displacement of 177ccm, the BGM PRO 177 always offers a sovereign and relaxed riding experience. The engine runs powerfully like a 200ccm machine, but with the same reliability and longevity. It achieves this by working in the same speed range as a standard engine. Low consumption values and the associated high range are another bonus of the BGM PRO 177 cylinder. The cylinder is designed to be fully compatible with all standard components. The only adjustment that is made is a change to the carburetor jetting and a spark plug with an adjusted heat value.

FEATURES
The BGM PRO 177 cylinder is a hard ceramic coated aluminum cylinder with 63mm bore. The coating (Nickel-Silicon-Carbide) ensures an extremely hard and durable running surface. The piston has a high silicon content. This means it has a lower thermal expansion, is more wear-resistant and thermally very stable. Two 1mm thick piston rings minimize friction and increase performance and speed resistance.

• Cylinder material: Aluminum

• Running surface: coated with Nickel-Silicon-Carbide

• Bore: Ø 63mm

• Displacement 57/60mm stroke: 177/187 ccm

• Piston: Cast piston with high silicon content and two 1mm steel piston rings

• Recommended squish clearance: 0.8- 1.2mm

FURTHER TUNING

The cylinder kit is designed as a plug 'n play solution. The cylinder offers, with full reliability, however, still a lot of potential upwards. With a 24mm carburetor of the 200ccm models and a BGM Big Box Touring exhaust, the performance is already around 15 PS and the torque is 17 - 19Nm at the rear wheel. The BGM PRO 177 reacts very gratefully to all performance-enhancing measures such as:

• A suitable exhaust system (BGM BigBox Touring (BGM1011TR), Polini Box (P2002018))

• A larger carburetor (BGM PRO Faster Flow SI24 (BGM8570))

• Crankshafts with extended intake timing (BGM031120G) and/or more stroke (BGM031121G)

• An optimized flywheel (BGM8025RT)

• Optimizations on the intake tract (reaming the intake channel)

• Enlargement of the overflow channel surfaces in the cylinder base gasket and in the engine case (The overflow channels at the cylinder base have an inlet. This means that the channels at the cylinder correspond to those at the engine case. The inlet can be easily removed to utilize the entire cross-section of the channels)

MORE DISPLACEMENT AND PERFORMANCE
The cylinder is already prepared at the factory to be used with a crankshaft with a larger crankshaft stroke (60mm instead of 57mm as standard). This increases the displacement to a hefty 187ccm and the performance-determining timing angles of the channels are enlarged. With corresponding crankshafts and further modifications to the engine, the cylinder can also be used without any problems with even larger stroke (up to 64mm, see crankshaft KINGWELLE). With this it reaches the full 200cc, but requires a membrane intake due to the necessary crankshaft (e.g. from MRP Racing 3331680 or 3331682).

IGNITION
Due to the optimized CNC cylinder head with narrowly tolerated squish clearance, the BGM PRO 177 cylinder is already very efficient and powerful. The ignition components, which are very high-quality in the Vespa PX models up to model year 2011, are therefore ideal for continuous operation. Special ignition modules or variable ignition timing are therefore not necessary for high performance and reliability. A simple static ignition setting to 19° BTDC is recommended, but the cylinder can easily be operated with the 18° advance timing as set ex-works on the PX125E models.

Models from 2011 use ignition components from China that do not allow very high speeds. Here, the ignition base plate, the flywheel and the CDI can be converted to the old, better design. We also offer a complete set (BGM666PXL). However, this eliminates the possibility of using an electric starter (the flywheel does not have a toothed ring for the E-starter).

TIMING ANGLES

• 57mm stroke: Overflow 118°, Exhaust 171° (with base gasket 0.2mm, no head gasket)

• 60mm stroke: Overflow 123°, Exhaust 173° (with base gasket 0.2mm, head spacer 1.5mm)

• (Head spacer for 60mm stroke not included in delivery, optional available, see accessories)

TRANSMISSION
Many customers extend the gear ratio after initial low power output stages, in order to make even better use of the newly gained power of the engine. This is done by simply replacing the clutch pinion. This is relatively easy to reach after disassembling the rear wheel and the clutch cover behind it. Alternatively, you can directly switch to a reinforced clutch type (see accessories). Afterwards, the gears can be accelerated much further and the achievable final speed is increased. The engine has so much power that the acceleration usually improves as well because less or faster shifting is required.

Generally, the reduction can be longer than usual in the 177ccm class due to the high torque. If a touring-oriented exhaust with early support is used (BigBox Touring, Polini Original Box), a clutch pinion with at least 23 teeth should be used on a PX125. We specifically lead these for the original primary wheel with 68 teeth (see accessories). Engines with long stroke also easily pull a 24/65 reduction on PX125 transmissions.

CONCLUSION
Universally usable plug 'n play cylinder kit with early performance, wide speed range, reliability like an original cylinder, low consumption values and thus an unbeatable price-performance ratio!

About the manufacturer BGM

BGM is a leading brand for high-quality spare parts and accessories for scooters, motorcycles and classic Vespa models, which stands for quality, precision and innovation. With a uncompromising “Made in Germany” philosophy, BGM develops durable products in cooperation with leading engineers and under strict quality controls. Whether in the restoration of vintage vehicles or in the tuning of modern scooters – BGM is the first choice for demanding drivers. Thanks to first-class processing and a wide range, BGM offers ideal solutions for performance, everyday use and individuality.