Description
The Polini Exhaust Evolution Yamaha BW's / Zuma 125cc ie (Minarelli) was developed by Polini's racing department. Modern design meets top performance and ear-pleasing sound.
The header pipe is made of stainless steel, the body of the lightweight aluminium silencer is anodized black (with Polini logo) and a carbon end cap. The bulge, or expansion chamber, in the header pipe reduces noise without hurting power, and improves low to mid end performance.
The exhaust was developed for the 158.31cc racing kit by Polini and will increase performance throughout the entire rpm range, with optimum acceleration and guaranteed top speed. Last but not least, it produces a satisfying, not too loud 4-stroke race sound.
Top quality materials and highest manufacturing standards are of course a given for all Polini products
Exhaust scooter, moped, motorcycle
The exhaust has a major influence on the performance of scooters and mopeds. By replacing the original with a tuning exhaust, you can improve the gas flow and increase the engine power.
exhaust parts
- The headpipe or header is the connection between cylinder and exhaust, and an exhaust gasket provides the necessary seal. In street-legal systems, the headpipe is equipped with a legally required restriction. Some people remove this restrictor to increase power.
- The actual exhaust body or expansion chamber is connected to the header pipe. In a classic 2-stroke expansion chamber type exhaust, gas pressure waves are used to improve engine performance.
- At the end there us the silencer or muffler that discharges the exhaust gases and, with the help of damping wool, also reduces the noise generated by the vehicle.
Replacing the exhaust
For 2-stroke engines, various settings and components usually need to be adjusted when the original exhaust is replaced with a tuning version. These changes include:
- Adjusting the carburetor by replacing the main jet.
- Upgrading the clutch or replacing the clutch springs.
- For scooters, it may be necessary to reduce the weight of the variator weights.
Tuning Level: Sport
We categorize our products into different performance levels Original, Sport, Racing and High End , so that our customers can choose the right parts for their setup. It is really important to combine parts that belong to the same tuning level, this is especially true for cylinders, crankshafts and exhausts.
The products listed under Sport yield better performance than Original parts. They may have technical differences, such as the use of higher quality materials, a larger displacement or a performance-enhancing design. They are suitable for everyday use and have a long service life.