Exhaust Flange Yasuni R1 Yamaha TZR 50

YASUNI R1

The popular Yasuni R1 exhaust needs no further introduction.

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 R1.

PERFORMANCE YASUNI R1

The Yasuni R1 is a powerful and high-torque exhaust, especially in the medium RPM range, and it is mainly intended for original / OEM quality cylinders and 50cc to 70cc entry-level tuning cylinders.

To fully utilize the performance of the Yasuni R1, we recommend using a 19 - 21mm carburetor and a reinforced clutch to avoid slippage when starting the engine.

The more power and displacement, the higher the number of the Yasuni R exhaust should be selected: Yasuni R1, R2, R3, R4...

Exhaust flange

The exhaust flange provides a stable, sealed and separable connection between the exhaust and the engine.

Function of the exhaust flange

Depending on the engine type, the exhaust flange is attached to the cylinder by means of bolts or by press-fitting. It is then fitted into the exhaust pipe and held in position by two exhaust springs, thus maintaining a certain flexibility. To ensure tightness, there is normally an exhaust gasket. Thus, the flange provides a secure and at the same time flexible connection between the cylinder and the exhaust.

And what is an exhaust restrictor?

Many 50cc scooters and motorcycles are factory equipped with an exhaust / manifold restrictor. This restriction reduces the diameter of the exhaust flange, which restricts the performance of the exhaust. This restriction was introduced to comply with noise emission regulations and to limit the speed of 50cc scooters and motorcycles.

Many riders remove this restriction to improve the performance of their two-wheeler. However, the gain in power then leads to the loss of the homologation, so beware!