Exhaust Yasuni R4 Max Black Derbi
Description
Yasuni Exhaust R4 black Derbi / Gilera, result of a successful collaboration with Spanish manufacturer Yasuni. Yasuni got together with "MXS Racing" to develop this incredibly powerful exhaust system.
The sheet metal body (welded) comes with a top quality black aluminium silencer. A lot of thought was given to designing shape and volume of the body to achieve maximum power at mid and high rpm range and an extremely wide power range. Excellent performance starting at mid to very high rpm.
Specifically developed to go with 84cc - 94cc "Hyper Racing" cylinders, it is very versatile and can be combined with most large displacement engines. Given its rather large size, we recommend combining it with a larger carburetor (at least 28mm).
Yasuni Exhaust R4 with black aluminium silencer Derbi / Gilera => reserved for the race track, NOT street-legal!
YASUNI R4
The Spanish brand was originally known in MotoGP, when two-strokes dominated the discipline, but has also built up an excellent reputation with high-quality exhausts for 50cc motorcycles, including the Yasuni R4.
PERFORMANCE YASUNI R4
This exhaust offers excellent performance starting at medium RPMs and remains consistently powerful up to very high engine speeds. The Yasuni R4 is the perfect fit for all high-end racing cylinders with a displacement of 84 to 94 cc.
Due to the large volume, it is recommended to install it in combination with a carburetor with a large diameter, such as a PWK 30, a large-volume tuning reed valve and a reinforced clutch to prevent the clutch from slipping.
The more power and displacement, the higher the number of the Yasuni R exhaust should be selected: Yasuni R1, R2, R3, R4...
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: High End 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.
High End Racing products are exclusively designed for racing and should only be handled by tuning pros with the appropriate technical know-how. High-end racing parts often require modifications or machining of certain elements to accommodate the often larger components (larger crank webs, larger intake, etc.). Whether you stick with 50cc or increase the displacement, high-end racing parts offer much higher performance than the original parts and are the most powerful tuning parts.
Note: To ensure the reliability of the engine, it is important that the parts are compatible and that you do regular maintenance on your two-wheeler.