Description
4-Stroke Exhaust Yasuni 4
Yasuni got into the maxi scooter market, and their exhaust systems are convincing as ever. The Yasuni 4 is an excellent exhaust system for 4-stroke maxi scooters, and it is street-legal.
The Yasuni 4 is the perfect combination of impressive performance, classy design and ear-pleasing sound. Scooter owners who are looking for a high-end replacement for their stock exhaust can expect a 10% increase in power, and torque is improved as well. It is really easy to mount and features several advantages over the original exhaust. It weighs ca. 40% - 50% less than the stock pipe which leads to improved agility.
The stainless steel head pipe does not consist of a single piece as is the case with most other 4-stroke systems - Yasuni goes all out and beyond, the manifold is the only one available (to date) that is welded from several cones. It has a progressive diameter to optimize performance. It generates negative pressure in the header pipe to reduces the base pressure and thus optimizes the gas flow. The aluminium silencer has a titanium look finish with a black end cap and Yasuni logo.
Assembly is quick and easy, small parts such as clamps, silentblocs, springs and screws are included.
A matching catalytic converter is available separately.
- Header pipe made from stainless steel AISI-304
- Colour: Titanium Look / black end cap
- With ECE homologation / road-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
As a general rule, please check if the exhausts fits BEFORE REMOVING THE RESTRICTOR, otherwise the exhaust cannot be returned.
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.
