Now when you are confident enough of riding your bike on dirt, you should look for a perfect dirt bike that would suit you the best. Buying a dirt bike greatly depends upon height, weight and age of the rider. Hence you must lookout for the bike that accurately fits your body so as to impart full balance and control all over. Power of the engine is given utmost preference while purchasing a dirt bike. There is no space for fuel efficiency if you are looking for a dirt bike because without sufficient engine power bike would not be able to go through the rugged path. You will have the option to choose from a two stroke engine and a four stroke engine. A two stroke engine imparts more power and thrust to the bike that would let you overcome the steep slopes quite easily but on the same way it would even be more difficult to control the instant acceleration that engine provides. A four stroke engine offers little less power and thrust but its durability is more than that of a two stroke engine. Four stroke engine is little heavier than that of two stroke engine and its fuel efficiency is also better. Thus, it all depends on need and choice of the rider that which one to go for.