1. Remove the air filter restriction. The air filter restriction on the Varadero 125 is often a plastic insert or cover located inside the airbox. Removing this restriction allows more air to flow into the engine, resulting in better combustion and increased power.
2. Modify the exhaust system. The stock exhaust system on the Varadero 125 can be restrictive and limit the engine's performance. Replacing the stock exhaust with a less restrictive aftermarket exhaust system can improve airflow and increase power.
3. Adjust the carburetor. Derestricting the carburetor involves modifying the jetting or fuel mixture to allow for more fuel flow into the engine. This can be done by changing the main jet, pilot jet, and/or needle position in the carburetor. Adjusting the carburetor requires a good understanding of carburetors and may require some trial and error to achieve the optimal settings for your motorcycle.
4. Install a high-performance spark plug. A high-performance spark plug with a higher heat range can help improve combustion and increase power.
5. Remove any other restrictions. Depending on the specific model of your Varadero 125, there may be other restrictions that can be removed. For example, some models may have a throttle stop that limits the throttle opening. Removing this restriction allows the throttle to open fully and increases power.
It's important to note that derestricting a motorcycle can have implications for its legality, warranty, and performance. Modifying your motorcycle beyond the manufacturer's specifications may void your warranty and affect the legality of your motorcycle. Additionally, derestricting can potentially impact the safety and reliability of your motorcycle, so it's crucial to approach these modifications with caution and have a proper understanding of the potential risks involved.
If you're unsure about performing any of these modifications yourself, it's recommended to consult with a qualified motorcycle mechanic or workshop that specializes in motorcycle performance modifications.