Posting this great article regarding jetting as a refresher and to help newcomers.   What is Jetting   Carburetor jetting can be easily understood if we understand the basic principles of carburetor and engine operation. A carburetor mixes fuel with air before it goes into the engine. When the mixture is correct the engine runs well. The bottom line is a carburetor must be adjusted to deliver fuel and air to the engine at a precise ratio. This precise ratio can be affected by a number of o