Question about 1997 Honda CB 500 S

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My CB500S has been resting on the centerstand with no startups for a few years. During the first startup today, it started but drained a lot of fuel from a hose connected to a pipe between the two carburettors, and then died. This happend several times. When I sealed off the outlet end of the hose, the engine seemed to work good. What is that hose, and how can I repair the malfunction.

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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.

Good luck
Steve

Posted on Aug 25, 2010

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