I've got a '77F with too many carb issues to rebuild. I got a set of carbs from a '78F that appear to in good shape. The '78 carbs appear to be identicle except for a second smaller rubber line going to the number 2 carb just in front of the main fuel line. I would like to know where that line goes on the bike. Is it a vacuum line, fuel line, or what? Thanks
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