The Yasuni Cross HM-PRO is a handcrafted expansion-chamber exhaust system, engineered specifically for 70cc displacement engines. It represents the natural evolution of the legendary Cross HM model.
The new HM-PRO is capable of delivering up to 23 HP, depending on the cylinder configuration and engine porting characteristics. Its performance-oriented design ensures optimal power delivery across a wide range of operating conditions.
Manufactured using a hand-built cone construction process, it provides excellent flow efficiency and throttle response, making it suitable for both demanding off-road riding and high-performance urban use.
It features a right-side outlet configuration, aligned with modern motorcycle chassis layouts, and is equipped with a 28 mm diameter exhaust flange.
This exhaust is fully homologated.
- Power output: 18–23 HP
- Torque: 17 Nm
- Weight: 3.1 kg
- Operating range: 50cc – 75cc
- Exhaust muffler finish: Blue aluminium
- Exhaust pipes finish: Stainless steel
- Homologation: CE homologated & Not approved in Switzerland
- Colour: Blue
- Exhaust muffler finish: Blue aluminium
- Exhaust pipes finish: Stainless steel
- Homologation: CE homologated & Not approved in Switzerland
- Colour: Blue
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