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I read on a kawasaki forum that if you store or dont ride for extended periods, and if your bike is carbed you should turn the petcock to "off". My owners manual doesnt address this issue. For storage it says to empty the carbs AND the tank, and coat the inside of the take with a light film of oil. Never done that before!! Always used Sta-Bil. Seems theres pros and cons on this practice. Ive never done it as a rule. Does it depend more on the year and model? Your thoughts? Here is a quote from the thread...
"I'm not sure what year/model manual you are looking at but the vacuum petcock that Kawasaki puts on the majority of it's bikes does exactly that when the engine is not running. The vacuum operated valve in the petcock will close when it doesn't have vacuum to it so I'd guess from that fact that they think it's a good idea to have the fuel off when the bikes not running."