* Increase Compression. The most effective way to increase power and speed is to increase compression. This can be done by installing a high-compression piston or head gasket. For a 2-stroke engine, changing a power valve spring would do. Be sure to use the correct fuel and octane rating. Higher compression engines usually require premium fuel.
* Install an exhaust system. A free-flowing exhaust system will help to improve airflow and increase horsepower.
* Tune the carburetor. A properly tuned carburetor will help to ensure that the engine is getting the correct amount of fuel and air.
* Install a high-performance air filter. A high-performance air filter will help to improve airflow and increase horsepower.
* Check the tire pressure. Make sure the tire pressure is set to the manufacturer's recommended level. Under-inflated tires can cause the engine to work harder and use more fuel.
* Clean the drive chain. A clean drive chain will help to reduce friction and improve performance.
* Use lightweight wheels and tires. Lightweight wheels and tires will help to reduce unsprung weight and improve acceleration.
* Install a gear-up kit. A gear-up kit will increase the top speed of the bike.
* Remove unnecessary weight. Remove any unnecessary weight from the bike, such as the passenger seat, rear-view mirrors, and turn signals.
* Improve aerodynamics. Install a belly pan or other aerodynamic modifications to improve the bike's aerodynamics.
* Get professional help. If you are not comfortable performing any of these modifications yourself, you can take the bike to a professional motorcycle shop.
Some of the abovementioned modifications may require specific tools or skills and would be best handed to an expert.
