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 kit

EVERYDAY PERFORMANCE BOOST
The BGM177 cylinder is a very powerful, durable and fully everyday-compatible upgrade cylinder. It covers a very wide range of applications. You can already more than double the performance of the 125cc standard engine simply by replacing the cylinder and enjoyably ride the large torque curve. At the same time, the exact 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 it further as needed.

The BGM PRO 177 replaces the original cylinder, and the upgrade is easily reversible if needed. With its large displacement of 177ccm, the BGM PRO 177 always offers a confident and relaxed riding experience. With it, the engine runs powerfully like a 200ccm machine, but is more responsive while maintaining exactly the same reliability and longevity. It achieves this by operating in the same speed range as a standard engine. Low fuel consumption 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 made is a change to the carburetor jetting and a spark plug with an adjusted heat range.

FEATURES
The BGM PRO 177 cylinder is a hard ceramic coated aluminum cylinder with a 63mm bore. The coating (Nickel-Silicon-Carbide) provides an extremely hard and durable running surface. The piston has a high silicon content. This gives it a lower thermal expansion, is more wear-resistant and thermally very stable. Two 1mm thick piston rings minimize friction and thus 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 at 17 - 19Nm on 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 inlet timing (BGM031120G) and/or more stroke (BGM031121G)

• An optimized flywheel (BGM8025RT)

• Optimizations on the inlet manifold (enlarging the inlet port)

• Enlargement of the transfer port areas in the cylinder foot gasket as well as in the engine case (The transfer ports on the cylinder foot have an inlet. This means that the ports on the cylinder correspond to those on the engine case. The inlet can be easily removed to use the full cross-section of the ports)

MORE DISPLACEMENT AND PERFORMANCE
The cylinder is already prepared ex works 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 ports are enlarged. With corresponding crankshafts and further modifications to the engine, the cylinder can also be used without any problems with an even larger stroke (up to 64mm, see crankshafts KINGWELLE). This then achieves the full 200cc, but requires a crankcase with an inlet control via a diaphragm valve (e.g. from MRP Racing 3331680 or 3331682) due to the necessary crankshaft.

IGNITION
Thanks to the optimized CNC cylinder head with tightly toleranced squish clearance, the BGM PRO 177 cylinder is already very efficient and powerful. The ignition components, which are very high-quality from the factory on Vespa PX models up to Bj. 2011, are therefore ideal for permanent operation as well. 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, as is 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 upgraded to the old, better design. We also offer a complete set here (BGM666PXL). However, this eliminates the possibility of using an electric starter (the flywheel does not have a gear tooth for the E-starter).

TIMING ANGLES

• 57mm stroke: Transfer port 118°, Exhaust 171° (with foot gasket 0.2mm, no head gasket)

• 60mm stroke: Transfer port 123°, Exhaust 173° (with foot gasket 0.2mm, head spacer 1.5mm)

• (Head spacer for 60mm stroke not included in the scope of delivery, optionally available, see accessories)

TRANSMISSION
Many customers extend the gearing after initial low performance stages, in order to be able to use the newly gained power of the engine even better. This is done by a simple exchange of the clutch sprocket. This is relatively easy to reach after dismantling the rear wheel and the clutch cover behind it. Alternatively, a reinforced clutch type can also be switched to directly (see accessories). Afterwards, the gears can be accelerated further and the achievable top speed is increased. The engine has so much power that the acceleration usually also improves because not so much or quickly has to be shifted.

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 sprocket with at least 23 teeth should be used on a PX125. We specifically offer these for the original primary gear with 68 teeth (see accessories). Engines with long-stroke crankshafts also easily pull a 24/65 reduction on PX125 transmissions.

CONCLUSION
Universally applicable Plug 'n Play cylinder kit with early performance, wide speed range, reliability like a standard cylinder, low fuel consumption and therefore 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 control. Whether restoring oldtimers or tuning modern scooters – BGM is the first choice for demanding drivers. Thanks to first-class workmanship and a wide range, BGM offers ideal solutions for performance, everyday life and individuality.