First, you will need to make sure that the 70cc engine will fit in the rocket. This may require some modifications to the frame, such as widening it or cutting out some of the material. You will also need to make sure that the engine mounts are compatible with the 70cc engine.
Second, you will need to upgrade the rocket's suspension and brakes to accommodate the increased power of the 70cc engine. The stock suspension and brakes may not be able to handle the increased speed and weight of the 70cc engine, and could potentially cause the rocket to become unstable or to crash.
Third, you will need to re-jet the carburetor to accommodate the increased airflow of the 70cc engine. This will ensure that the engine gets the proper amount of fuel and air to run properly.
Finally, you may need to upgrade the rocket's exhaust system to accommodate the increased exhaust flow of the 70cc engine. The stock exhaust system may not be able to handle the increased pressure and heat of the 70cc engine, and could potentially become damaged.
It is important to note that making these modifications to the rocket will void the warranty, and could potentially make it unsafe to ride. Therefore, it is important to weigh the risks and benefits before deciding whether or not to put a 70cc pocket rocket engine in a 49cc rocket.
