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My Zuma carb is different than that one, but I can help you in the right direction. If 2 is a vacuum line, then 6 is your oil feed line from the oil pump. (The hose that goes "down into the engine.")
Your other guesses are correct, and 5 is not used I believe.
Do not run the engine if the oil feed is blocked or disconnected, you will seize the engine and then have to buy a new cylinder kit.
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2005 Yamaha BWS (Zuma) "Garfield"
TP Black Trophy 70cc, Giannelli Reverse Pipe, 5g Dr. Pulley Sliders, Delta Clutch with Yellow Springs and Yellow Contra, Malossi Torque Controller, Naraku R-Vent Bell, NCY Adjustable Secondary Sliding Sheave, CF Reeds, Kege Analog Tach, Dual Headlight Mod, N.A. Rear Fender Delete, OEM Short Windshield.
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