The Yamaha Valve Guide is a piece of tubed metal that gets dropped or pressed into the cylinder head. The valve then rides inside the guide; these little puppies also help eliminate heat from the engine from the exhaust valve and into the cylinder head, where the cooling system can help dissipate it. These are essential parts of the fuel intake system as well. They will eventually start to deform and leak with regular wear and tear, dropping the overall compression and causing the valve to ride an unnatural path, eventually leading to it being sheared off completely. If that happens, you are looking at a very costly rebuild. Avoid that major bill by staying up on maintenance like this.Get outfitted with a new aftermarket Valve Guide from Buggies Unlimited for your Yamaha cart today. Let's make sure it is the proper one, though. If you have it handy, grab your parts and service manual and match the OEM number up. J38-11133-08 was the original. Call and get one ordered.