Silencer Pro Circuit R-304 Shorty Beta RR 250/300 2014-2018

Pro Circuit R-304 Shorty

The Pro Circuit 304 silencer is an absolute classic for all fans of 2-stroke motocross bikes. It has been on the market for several decades and continues to be listed in the Pro Circuit catalog. Updated each year to fit the latest models, it maintains its status as a benchmark in this field.

The Shorty version is designed for Supercross. It is a shortened version of the 304 specifically for SX and shorter tracks.

Top quality and great performance

In addition to a great supercross sound, the 304 Shorty also provides a slight increase in power at low revs, which can be very useful for jumping a perfect triple after exiting a corner.
In addition, Pro Circuit sets the highest standards for robustness and durability with this product.

• Brushed aluminum housing
• Connecting pipe and end cap made of 304 stainless steel
• Easily removable with 3 screws (for changing the silencer stuffing)

In combination with a Works exhaust from Pro Circuit, you cannot only give your 2-stroke motocross bike a top-notch sound, but also achieve maximum performance.

We recommend the 304 Factory Sound for motocross riders who have to pay more attention to noise.

Silencer for motorcycle, scooter, moped

The silencer or muffler, is an essential part of the exhaust a two-wheeler. Its main function is to reduce the noise produced by the exhaust gases as they exit the engine, thus preventing unnecessary noise pollution.

How does a silencer work?

The silencer is usually a tube with perforated internal chambers that are surrounded by a sound-absorbing material. As exhaust gases enter the muffler, they pass through the openings in the walls of the pipe and are then absorbed by the silencer wool.

Silencer Maintenance

Should you notice that your two-wheeler is getting louder and louder, it's time to replace the insulation wool and exhaust gaskets. Maintenance is relatively easy  and requires only a few tools.

If you regularly maintain your motorcycle or scooter, we recommend purchasing an exhaust plug to maintain the effectiveness and life expectancy of the insulation material.

How do I replace the silencer's rock wool?

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.