Gaskets on a motorcycle engine are seals at a point where two metal pieces meet. Motorcycles have many different gaskets for their various components. Each engine component is different and the gaskets are located in different places in and on the motorcycle's engine. The gasket you are replacing will determine which tool you need and how long the job will take you. However, no matter which gasket you are replacing, this is going to be a time-consuming job.
Allow the motorcycle's engine to cool before proceeding. Use a ratchet set and box wrench to remove any components connected to the engine.
Remove the head(s) on the top of the engine. Remove the bolts around the edges of the heads with a ratchet set. Pull the heads off and remove the gasket with a metal scraper.
Clean the old adhesive off the edge of the engine block and the heads with gasoline and a towel. Apply new gasket adhesive on the edge of the heads and the engine block.
Place the new gasket onto the edge of the engine block. Place the heads onto the top of the engine block and press down. Make sure that the new gasket is completely flush with the edge of the engine and the heads before placing it onto the engine.
Replace the bolts on the edge of the heads and use a torque wrench to torque them to your motorcycle's correct specification. Replace the components to the engine in the reverse order that you removed them.