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- Exhaust - BGM PRO 55mm Stroke - Piaggio 125-180cc AC/LC 2-Stroke Maxi - Gilera Runner FX/FXR 125-180, Italjet Dragster 125-180
Made in NederlandCompatible with the Gilera Runner FX / FXR 125–180, Italjet Dragster 125–180, and other Piaggio Maxi 2-stroke engines in the 125–180 cc range.
The BGM PRO exhaust for 55 mm stroke is a distinctly sporty performance system designed for Piaggio Maxi 2-stroke engines with a long-stroke setup. Unlike the 52-mm version, this model is much more specifically tailored to 55-mm crankshafts and thus to powerful 172- to 180-cc configurations. It’s designed for engines that are cleanly built, are meant to rev freely at the top end, and where the cylinder, head, and valve timing are truly matched to the stroke.
This version is particularly suited for 55-mm crankshaft setups. The available sources primarily mention the Piaggio original 172, Malossi 172, and PM Tuning 180. Dealers also mention original 125cc, 150cc, and 180cc cylinders, although the exhaust only truly comes into its own there when the engine is properly configured for a long-stroke setup.
According to available dealer information, the exhaust works well with the stock ignition system. However, for it to run truly smoothly, the entire setup should be tailored to a 55-mm stroke. This is precisely where a well-tuned long-stroke engine differs from a mere collection of assembled parts.
In practice, with a 55 mm stroke, it’s often not enough to simply install a long-stroke crankshaft under a standard cylinder. The community has made it very clear that, with such setups, the cylinder, cylinder head, and valve timing must be adjusted so that the engine runs smoothly and the exhaust system functions effectively.
The BGM PRO exhaust in this 55-mm class is not a run-of-the-mill stock replacement, but a true performance system for sporty Piaggio Maxi engines. It is particularly appealing when a Runner, Dragster, or Hexagon engine is specifically built as a 55-mm long-stroke setup and is intended to operate freely and smoothly at high RPMs.
| Manufacturer | BGM PRO |
|---|---|
| Type | Performance exhaust for 55 mm stroke |
| Compatible with | Piaggio 125–180 cc AC/LC 2-stroke Maxi |
| Application | Sporty 172 and 180 setups |
| Operating range | Approx. 9,000–10,500 rpm, depending on the setup |
| Cylinder Base | Piaggio 172, Malossi 172, PM Tuning 180, and similar 55-mm designs |
The BGM PRO exhaust for 55 mm stroke is a serious performance system for Piaggio Maxi 2-stroke engines that are specifically configured as long-stroke setups. If you’re looking for a sporty exhaust system for 172–180 configurations and want to properly match the cylinder, head, and valve timing, this provides a very well-balanced foundation for Runner, Dragster, and related Piaggio platforms.
