Question about 1997 Honda CB 500 S
This probably the overflow hose. What it does is allow the fuel a place to go in the event your needle and seat fails to close. Without this, the fuel would run into your engine, seep past the rings, and contaminate your oil.
If your bike has been sitting up for that long, you carbs probably need to be gone though and cleaned. The jets are probably stopped up and the reason your bike ran better when you stopped the hose up is that it was getting fuel into the cylinders although it wasn't the right way.
Take the carbs off and have them disassembled and cleaned.
Posted on Aug 25, 2010
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Posted on Jan 02, 2017
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