* Increase the compression ratio. This can be done by using a higher compression piston or a thicker head gasket. Increasing the compression ratio will increase the power output of the engine.
* Port and polish the cylinder head. This will improve the airflow into the engine, which will increase the power output.
* Install a performance exhaust system. A performance exhaust system will help the engine to breathe better, which will increase the power output.
* Install a larger carburetor. A larger carburetor will allow more air and fuel to enter the engine, which will increase the power output.
* Install a performance air filter. A performance air filter will allow more air to enter the engine, which will increase the power output.
* Install a higher performance spark plug. A higher performance spark plug will help to improve the ignition of the fuel, which will increase the power output.
* Install a performance clutch. A performance clutch will help to transfer more power from the engine to the wheels, which will increase the acceleration.
* Install a performance camshaft. A performance camshaft will help to improve the valve timing, which will increase the power output.
* Increase the sprocket ratio. This will make the ATV accelerate faster, but it will also reduce the top speed.
* Install larger tires. Larger tires will increase the ground clearance and make the ATV more stable, but they will also reduce the top speed.