Exhaust FMF Gnarly nickel-plated CR 250 2003-2004

FMF Gnarly

The FMF Gnarly exhaust bulbs are classic enduro exhausts. Thanks to the nickel-plated coating, they do not require much maintenance as they do not rust.

Performance FMF Gnarly

• Improved low and medium RPM range
• Durable and rust-free nickel coating
• Linear speed range
• Ideal for enduro or on muddy grounds

To further improve the performance of the exhaust or to comply with the noise standards used in enduro sports, we recommend the use of an FMF Turbinecore silencer.

For enduro use or on tracks with lots of stones, we also recommend an exhaust guard.

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.