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Perfect float valves won't let gas through when the bike is sitting. Unfortunately perfect float valves are few and far between. A piece of grit getting into the carb can cause leaking too. The reason the petcock is on the tank is so the fuel can be shut off when the engine is stopped. You should ALWAYS shut the fuel off when you turn the key off to avoid this kind of problem in the future. Honda put an automatic petcock on the 1500 to prevent this. It's a vacuum operated valve. The 1800s and 1200LTD/SEI don't need 'em because they have fuel injection, but all the others need to have the valve turned off. Any fuel system where the tank is above the carbs needs a shut off valve. Change the oil and keep the valve shut, that's all you need to do.
Perfect float valves won't let gas through when the bike is sitting. Unfortunately perfect float valves are few and far between. A piece of grit getting into the carb can cause leaking too. The reason the petcock is on the tank is so the fuel can be shut off when the engine is stopped. You should ALWAYS shut the fuel off when you turn the key off to avoid this kind of problem in the future. Honda put an automatic petcock on the 1500 to prevent this. It's a vacuum operated valve. The 1800s and 1200LTD/SEI don't need 'em because they have fuel injection, but all the others need to have the valve turned off. Any fuel system where the tank is above the carbs needs a shut off valve. Change the oil and keep the valve shut, that's all you need to do.
