Before you pull the carbs off, just disconnect the fuel line at the left carb. I believe you have the vacuum operated petcock in which case fuel will not flow with the petcock in the "on" position unless the engine (or an external source) is supplying vacuum to open the valve. I believe it will flow when in the "res" position (at least that's how it worked on my GL500). That's how you get fuel in the bowls to start the engine so the petcock will work.:roll:
I had a Spree with a dreaded vacuum petcock. I recall that I had to rig up a hose spliced into the vacuum line to suck on to prime the carb if it had been sitting for a while (days). I was not sucking fuel, just creating vacuum. My memory is schetchy on this- long time ago.
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