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 an electric starter.

PERFORMANCE BOOST SUITABLE FOR EVERYDAY USE
The BGM177 cylinder is a very powerful, durable and fully suitable for everyday use upgrade cylinder. It covers a very wide range of applications. Simply by replacing the cylinder, you can more than double the performance of the 125cc standard engine, while wonderfully surfing on the large torque wave. The exact same cylinder can also transform the engine into a beast with over 20PS if it finds the right environment (carburetor, exhaust, crankshaft). This makes the cylinder a perfect base for beginners to further expand it as needed.

The BGM PRO 177 replaces the original cylinder, the conversion can be easily revised if necessary. With its large displacement of 177ccm, the BGM PRO 177 always offers a confident and relaxed driving experience. The engine runs powerfully like a 200cc machine with the same reliability and durability. 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 in 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) ensures 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: 0.8- 1.2mm

CYLINDER HEAD
The cylinder head is CNC milled from solid material. The combustion chamber is recessed 4 mm into the cylinder for perfect centering. This also makes adjusting the squish significantly easier and ensures a constant seal. A thread for mounting a temperature sensor is located in the middle. The compression ratio was deliberately chosen to be low and is 10.3:1. For this reason, the squish can be lower than with comparable other cylinders.

FURTHER TUNING
The cylinder kit is designed as a plug 'n play solution. The cylinder offers, with full reliability, however, still very much potential upwards. With a 24mm carburetor from the 200cc models and a BGM Big Box Touring exhaust, the power is already around 15 PS and the torque at 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 manifold (reaming the intake channel)

• Enlargement of the overflow channel surfaces in the cylinder base gasket as well as in the engine housing (The overflow channels on the cylinder base have an inlet. Thus the channels on the cylinder correspond to those on the engine housing. The inlet can be easily removed to use the complete cross-section of the channels)

MORE DISPLACEMENT AND POWER
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 whopping 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 an even larger stroke (up to 64mm, see crankshafts 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 tightly toleranced squish, the BGM PRO 177 cylinder is already very efficient and powerful. The factory ignition components on the Vespa PX models up to Bj. 2011 are therefore ideal for permanent operation. Special ignition modules or a 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 also be operated without any problems with the 18° advance, as it is set ex works on the PX125E models. Models from 2011 use ignition components from China which do not allow very high speeds. Here, the ignition base plate, the flywheel and the CDI can be upgraded to the old, better version. We also offer a complete set (BGM666PXL). However, this eliminates the possibility of using an electric starter (the flywheel does not have a tooth ring for the E-starter).

TIMING ANGLES

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

• 60mm stroke: Transfer 123°, Exhaust 173° (with foot gasket 0.2mm, head spacer 1,5mm)

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

TRANSMISSION
Many customers extend the transmission in the follow-up even in low performance levels, in order to be able to use the newly gained power of the engine even better. This is done by a simple replacement of the clutch pinion. 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 directly (see accessories). After that, the gears can be accelerated much further and the reachable top speed is increased. The engine has so much power that the acceleration is usually better 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 pinion with 23 teeth should be used on a PX125 at least. We specifically carry these for the original primary gear with 68 teeth (see accessories). Engines with a long-stroke crankshaft also easily pull a 24/65 reduction on PX125 transmissions.

CONCLUSION
Universal usable plug 'n play cylinder kit with early onset of power, wide speed band, reliability like a standard 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 restoring oldtimers or tuning 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 life and individuality.