Rebuilding a carburetor is not a hard task to do. Especially when we already have the repair kit for your carburetor. Commonly, carburetor problems are due to varnish, dirt particles and other deposits that hinders the narrow fuel and air channels inside. However, O-rings and gaskets are also common culprit of the problems. In time, they eventually shrink thus cause the fuel and air leaks that end up to a poor engine performance. For a complete guide and step by step procedure in rebuilding your Briggs & Stratton carburetor, go to http://www.briggsandstratton.com/engines/support/frequently-asked-questions/Overhauling%20the%20Carburetor/.