If you're having trouble opening the petcock on an old Harley Davidson motorcycle to allow fuel to flow into the engine, there are a few steps you can take to address the issue. Here's what you can try:
Ensure the petcock is in the correct position: The petcock typically has three positions: "ON," "OFF," and "RESERVE." Make sure it is set to the "ON" position for fuel to flow.
Apply gentle force: Sometimes, the petcock valve can get stuck due to debris or corrosion. Try using a pair of pliers or a wrench to gently apply force to the petcock lever. Be careful not to use excessive force as it may damage the valve.
Tap the petcock: Lightly tapping the petcock with a rubber mallet or a similar tool can help dislodge any debris or corrosion that may be causing it to stick. This may loosen the valve and allow it to turn more easily.
Apply penetrating oil: If the petcock remains stuck, you can try spraying some penetrating oil, such as WD-40, into the petcock's valve area. Allow the oil to penetrate for a few minutes, and then attempt to turn the valve again.
Clean or rebuild the petcock: If none of the above methods work, it may be necessary to disassemble and clean the petcock or replace any worn-out parts. This task may require some mechanical knowledge, so it's advisable to consult a motorcycle mechanic or refer to a repair manual specific to your Harley Davidson model.
Remember, if you're unsure about any aspect of the repair process or lack the necessary expertise, it's best to seek assistance from a qualified motorcycle mechanic to avoid any potential damage or injury.