BGM PRO 177ccm Tuning Kit for Vespa PX125/150 – More Power & Riding Fun
The kit includes:
- BGM Pro 177 cylinder kit
- BGM Pro Touring exhaust
- BGM Pro SI24 carburettor
- Main jet kit
Optimal Combination of Power, Torque & Everyday Usability
Designed to give the best combination of power, torque, and durability based on the stock engine.
The kit can be installed on the standard engine case without any additional machining (no milling, turning, or grinding required).
PERFORMANCE & CHARACTERISTICS
After installation, the engine achieves at least twice the power of an original PX125.
Typical performance values:
- At least 12HP at 6000RPM
- At least 15Nm at 5200RPM
Technology, Setup Options & Riding Characteristics
The high torque available from low RPM is maintained across a broad rev range. This allows a relatively short gearbox setup, ideal for city and country riding. The engine becomes very responsive and especially fun in acceleration.
The easiest way to achieve this is by simply swapping the clutch gear. Replace the existing gear (20, 21, or 22 teeth) with a 23-tooth gear. For an easy-to-operate high-quality sports clutch, the BGM Superstrong clutch with 23 teeth (for 68-tooth primary gear) is ideal.
CONCLUSION
The result is a lively, powerful, and highly durable touring engine that remains fuel-efficient. Additionally, it provides a great foundation for future upgrades.
FURTHER UPGRADES
The kit particularly benefits from a crankshaft with modified intake timing and (optionally) a longer stroke. The BGM177 cylinder is designed from the outset to support longer stroke setups and only requires a thicker head gasket (1.5 mm) for long-stroke cranks.
More Power & Headroom for Expandable Engines
If you enjoy engine tuning, you'll be amazed at how easily you can further increase the engine’s power without modifying the cylinder itself. The key lies in the rotary valve intake controlled by the crankshaft.
The intake is enlarged in the engine case to the maximum possible area (ensure adequate sealing surface for the crank webs) and the carburettor tray is opened up to suit a 26 mm carburettor. As a result, achieving over 16HP/19Nm at the rear wheel is no problem, while maintaining the same usable rev range. Thanks to the high product quality, the engine remains perfectly suitable for everyday use and can handle sustained full-throttle autobahn riding. Depending on the chosen gearing, such an engine can easily reach 120 km/h. For older engines, we recommend a full engine rebuild beforehand, especially replacing the crankshaft seals. This ensures lasting riding enjoyment over many thousands of kilometres.
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