Polini Exhaust "Evolution" street-legal Derbi Senda / DRD after 2000 (underseat exhaust)
Sorry, this Item has been Discontinued
This product is no longer being manufactured, so unfortunately we can no longer offer it.
However, we would like to help you find an alternative. Please take a look at other products within the same category or contact us so we can help you with selecting the right product.
Description
The expansion chamber is made of thin sheet metal (rolled and welded) and comes with an aluminium silencer that, as a special feature, is located under the seat (note: the mudguard/tail light unit has to be removed or relocated!)
To get the most out of it, you should combine it with a 17.5mm carburetor or, even better, a 19-21mm carburetor.
It is street-legal.
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: Racing
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.
Racing products are designed for a more extreme uses and are developed primarily for racing. Whether you stay at 50cc or increase the displacement, the corresponding Racing parts produce much higher performance than the original parts in order to achieve maximum power.