The operating principle of the Jet Ski follows Newton's laws of motion, specifically the third law. Every action has an equal and opposite reaction. Like any other vehicle, the personal watercraft are also powered by a motor, though there are some definitive properties which set it apart from a regular motor. The handle of the Jet Ski connects directly to the engine's ignition through an electrical interface which aids in the process of switching the motor on. After this initial powering on, the engine continues to purr and when accelerated, powers the craft. The engine generates a lot of heat in this process which is dissipated by using water as the cooling agent. Quite obviously, used jet skis are far cheaper than new ones. However, the fact that they are used means that they could be quite old and used. Therefore you should always take time to learn how old the jet ski is, and what is its year of manufacture. There is no need of getting excited that you are buying a used one for a very affordable and cheap price, only for it to start developing mechanical complications within a few months. One can even go as far as concluding that the cheaper one, then the more likely it is to be worn out, and near to being unusable. The most basic method for preventing a tragic accident from occurring is through proper training. Only adults who are trained and experienced in operating a personal water craft should take charge of one of these vehicles alone. Adolescents should not operate these machines unless they have adequate experience. Furthermore, alcohol and water sports should never mix. Drunkenly operating a water craft is comparable to driving a car while drunk. As long as those operating jet skis act with care and awareness, it is less likely they will have the misfortune of being involved in a personal water craft accident. This is a very important aspect of the Jet Ski rental procedure; if you have a clear idea about what you need, you will be able to save quite a bit on rental charges. The first thing to determine is if the cost of Jet Ski rental in the area where you will be living or spending your vacation suits your budget. You need to analyze the amount of time that you intend to spend using the personal water craft; the model that you are interested in etc. Many businesses have a minimum limit on the number of days for which you can rent the water craft; this can range from one to several days. Then there are other establishments that will be happy to offer you watercraft rentals on an hourly or daily basis; this is usually a more cost effective option. One great place to get jet ski parts is to try out the internet auction sites. Many times there will be someone who had the same type machine that you have, and they are trying to make a little money by scrapping it out for parts. Simply put, that means selling the jet ski part by part. You can often find just what you need by searching your make and model on the auction site. This is usually a cost effective way to get your parts. Although you will need to use caution, paying close attention to the details of the part, and the rating and return policy of the person listing the item.