190CCM POWERPACK FOR VESPA PX125/150 (also electric start models)

The BGM 190ccm tuning kit consists of two reliable components: the now thousand-times proven BGM177/190 cylinder and the stable and reliable BGM Touring crankshaft with extended stroke (60mm instead of 57mm).

Together they form an extremely harmonious unit that functions powerfully on one hand and ultra-reliably on the other. The BGM cylinder was designed specifically for optional use with a long-stroke crankshaft. Thus, the longer stroke of the BGM crankshaft is balanced by a head gasket spacer included in the set. This results in ideal cylinder port timing for a powerful sport tourer.

The kit can be installed as a pure bolt-on tuning, i.e., without milling/adaptation work on any PX125/PX150 engine (and identical ones such as LML or older Vespa engines like Sprint150 Veloce, GTR125). With a suitable exhaust, such as the perfectly harmonizing BGM BigBox Touring, you can effortlessly exceed the performance values of a Vespa PX200. A full 13-15HP is then available at the rear wheel (original PX125 approx. 5-6HP), meaning the scooter accelerates very quickly and, depending on the chosen gear ratio, travels well over 100km/h.

Those who want to call up more power from the start can increase the performance significantly with relatively simple means. 16-19HP is no problem by simply adapting the transfer ports (see our video tutorials on our youtube channel) and the intake including the carburetor of the 200ccm models (SI24/24E). The engine remains as reliable as a stock engine because the RPM stays at the level of the stock engine. The quality and grade of the materials used also allow for continuous full-throttle operation without problems.

Fuel consumption remains very moderate for the performance values and is between 3.5-4.5 liters.
The noise level also remains pleasantly low, also a result of the moderate RPM level.

For engines that are mainly moved in the city and cross-country, an extension of the gear ratio using a clutch sprocket to 23 teeth (23/68= 2.95) is sufficient.

Those who have a high top speed in mind or like to drive on the highway and do not want high RPMs can switch to a completely changed primary gear ratio. We recommend the BGM primary gear for the PX200 with 65 teeth or 64 teeth.
This also fits the intermediate shaft of the PX125/150 models. Together with a matching BGM clutch sprocket with 22, 23 or 24 teeth, the full range of possible gear ratios is available for selection. A 23/64 primary has emerged as a good choice here.

CYLINDER

• Cylinder material: Aluminum
• Bore: coated with nickel-silicon carbide
• Bore: Ø 63mm
• Displacement 60mm stroke: 187 ccm
• Piston: cast piston with high silicon content and two 1mm steel piston rings
• Recommended squish gap: 0.8- 1.2mm

Port timing

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

The transfer ports at the cylinder base have a casting flash. Thus, the ports on the cylinder match those on the engine housing. The flash can be easily removed to use the full cross-section of the ports.

The cylinder head is CNC milled from solid material. The combustion chamber is recessed 4 mm into the cylinder for perfect centering.
Additionally, adjusting the squish gap is considerably facilitated and sealing is always guaranteed. There is a central thread for mounting a temperature sensor.

CRANKSHAFT

BEARING
The lubrication of the lower connecting rod bearing takes place via two large lubrication slots and a total of four additional pockets on the side. The SSC racing bearing and the side thrust washers ensure solid bearing support. The lubrication of the upper connecting rod bearing takes place via two lubrication bores. The INA piston pin bearing is included in the scope of delivery of the crankshaft.

INTAKE ANGLE
Compared to many other racing shafts, the bgm PRO Touring shaft has a significantly better layout of the intake timing. With tuning cylinders, the standard shaft with its very short intake timing cannot keep up. The bgm PRO shaft, on the other hand, closes on a PX engine housing approx. 58° after top dead center (this varies from the factory depending on the engine housing). The engine can be tuned well with these port timings. Tip: If the intake is modified so that the crankshaft clears the intake slot earlier, additional power can be gained. A good value here has turned out to be approx. 120° BTDC.

Conclusion
The combination of bgm PRO crankshaft and bgm Pro cylinder is a good decision in all respects. Highest quality for every component. Precision in manufacturing, the materials used offer high and permanent performance. All at 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, standing for quality, precision and innovation. With an uncompromising "Made in Germany" philosophy, BGM develops long-lasting products in cooperation with leading engineers and under strict quality controls. Whether restoring vintage cars or tuning modern scooters – BGM is the first choice for demanding riders. Thanks to first-class workmanship and a wide range of products, BGM offers ideal solutions for performance, everyday use and individuality.